diff --git a/TestON/tests/IntentPerfNext/IntentPerfNext.params b/TestON/tests/IntentPerfNext/IntentPerfNext.params
index dbcd05c..8909059 100644
--- a/TestON/tests/IntentPerfNext/IntentPerfNext.params
+++ b/TestON/tests/IntentPerfNext/IntentPerfNext.params
@@ -36,7 +36,7 @@
 
     <TEST>
         #Number of times to iterate each case
-        <numIter>12</numIter>
+        <numIter>3</numIter>
         <numIgnore>2</numIgnore>
         <numSwitch>8</numSwitch>
         <batchThresholdMin>0</batchThresholdMin>
diff --git a/TestON/tests/IntentPerfNext/IntentPerfNext.py b/TestON/tests/IntentPerfNext/IntentPerfNext.py
index 74ce298..40a1276 100644
--- a/TestON/tests/IntentPerfNext/IntentPerfNext.py
+++ b/TestON/tests/IntentPerfNext/IntentPerfNext.py
@@ -1,164 +1,165 @@
-#Intent Performance Test for ONOS-next
+# Intent Performance Test for ONOS-next
 #
-#andrew@onlab.us
+# andrew@onlab.us
 #
-#November 5, 2014
+# November 5, 2014
+
 
 class IntentPerfNext:
-    def __init__(self):
+
+    def __init__( self ):
         self.default = ""
 
-    def CASE1(self, main):
-        '''
+    def CASE1( self, main ):
+        """
         ONOS startup sequence
-        '''
-        
+        """
         import time
-        global cluster_count
-        cluster_count = 1 
+        global clusterCount
+        clusterCount = 1
 
-        cell_name = main.params['ENV']['cellName']
+        cellName = main.params[ 'ENV' ][ 'cellName' ]
 
-        git_pull = main.params['GIT']['autoPull']
-        checkout_branch = main.params['GIT']['checkout']
+        gitPull = main.params[ 'GIT' ][ 'autoPull' ]
+        checkoutBranch = main.params[ 'GIT' ][ 'checkout' ]
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS4_ip = main.params['CTRL']['ip4']
-        ONOS5_ip = main.params['CTRL']['ip5']
-        ONOS6_ip = main.params['CTRL']['ip6']
-        ONOS7_ip = main.params['CTRL']['ip7']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ]
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ]
 
-        main.ONOSbench.onos_uninstall(node_ip=ONOS1_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS2_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS3_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS4_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS5_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS6_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS7_ip)
+        main.ONOSbench.onosUninstall( nodeIp=ONOS1Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS2Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS3Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS4Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS5Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS6Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS7Ip )
 
-        MN1_ip = main.params['MN']['ip1']
-        BENCH_ip = main.params['BENCH']['ip']
-    
-        main.case("Setting up test environment")
+        MN1Ip = main.params[ 'MN' ][ 'ip1' ]
+        BENCHIp = main.params[ 'BENCH' ][ 'ip' ]
 
-        main.step("Creating cell file")
-        cell_file_result = main.ONOSbench.create_cell_file(
-                BENCH_ip, cell_name, MN1_ip,
-                "onos-core,onos-app-metrics,onos-gui",
-                ONOS1_ip)
+        main.case( "Setting up test environment" )
 
-        main.step("Applying cell file to environment")
-        cell_apply_result = main.ONOSbench.set_cell(cell_name)
-        verify_cell_result = main.ONOSbench.verify_cell()
+        main.step( "Creating cell file" )
+        cellFileResult = main.ONOSbench.createCellFile(
+            BENCHIp, cellName, MN1Ip,
+            "onos-core,onos-app-metrics,onos-gui",
+            ONOS1Ip )
 
-        main.step("Removing raft logs")
-        main.ONOSbench.onos_remove_raft_logs()
+        main.step( "Applying cell file to environment" )
+        cellApplyResult = main.ONOSbench.setCell( cellName )
+        verifyCellResult = main.ONOSbench.verifyCell()
 
-        main.step("Git checkout and pull "+checkout_branch)
-        if git_pull == 'on':
-            checkout_result = \
-                main.ONOSbench.git_checkout(checkout_branch)
-            pull_result = main.ONOSbench.git_pull()
-           
-            #If you used git pull, auto compile
-            main.step("Using onos-build to compile ONOS")
-            build_result = main.ONOSbench.onos_build()
+        main.step( "Removing raft logs" )
+        main.ONOSbench.onosRemoveRaftLogs()
+
+        main.step( "Git checkout and pull " + checkoutBranch )
+        if gitPull == 'on':
+            checkoutResult = \
+                main.ONOSbench.gitCheckout( checkoutBranch )
+            pullResult = main.ONOSbench.gitPull()
+
+            # If you used git pull, auto compile
+            main.step( "Using onos-build to compile ONOS" )
+            buildResult = main.ONOSbench.onosBuild()
         else:
-            checkout_result = main.TRUE
-            pull_result = main.TRUE
-            build_result = main.TRUE
-            main.log.info("Git pull skipped by configuration")
+            checkoutResult = main.TRUE
+            pullResult = main.TRUE
+            buildResult = main.TRUE
+            main.log.info( "Git pull skipped by configuration" )
 
-        main.log.report("Commit information - ")
-        main.ONOSbench.get_version(report=True)
+        main.log.report( "Commit information - " )
+        main.ONOSbench.getVersion( report=True )
 
-        main.step("Creating ONOS package")
-        package_result = main.ONOSbench.onos_package()
+        main.step( "Creating ONOS package" )
+        packageResult = main.ONOSbench.onosPackage()
 
-        main.step("Installing ONOS package")
-        install1_result = main.ONOSbench.onos_install(node=ONOS1_ip)
-        #install2_result = main.ONOSbench.onos_install(node=ONOS2_ip)
-        #install3_result = main.ONOSbench.onos_install(node=ONOS3_ip)
+        main.step( "Installing ONOS package" )
+        install1Result = main.ONOSbench.onosInstall( node=ONOS1Ip )
+        #install2Result = main.ONOSbench.onosInstall( node=ONOS2Ip )
+        #install3Result = main.ONOSbench.onosInstall( node=ONOS3Ip )
 
-        main.step("Set cell for ONOScli env")
-        main.ONOS1cli.set_cell(cell_name)
-        #main.ONOS2cli.set_cell(cell_name)
-        #main.ONOS3cli.set_cell(cell_name)
+        main.step( "Set cell for ONOScli env" )
+        main.ONOS1cli.setCell( cellName )
+        # main.ONOS2cli.setCell( cellName )
+        # main.ONOS3cli.setCell( cellName )
 
-        time.sleep(5)
+        time.sleep( 5 )
 
-        main.step("Start onos cli")
-        cli1 = main.ONOS1cli.start_onos_cli(ONOS1_ip)
-        #cli2 = main.ONOS2cli.start_onos_cli(ONOS2_ip)
-        #cli3 = main.ONOS3cli.start_onos_cli(ONOS3_ip)
+        main.step( "Start onos cli" )
+        cli1 = main.ONOS1cli.startOnosCli( ONOS1Ip )
+        #cli2 = main.ONOS2cli.startOnosCli( ONOS2Ip )
+        #cli3 = main.ONOS3cli.startOnosCli( ONOS3Ip )
 
-        utilities.assert_equals(expect=main.TRUE,
-                actual = cell_file_result and cell_apply_result and\
-                         verify_cell_result and checkout_result and\
-                         pull_result and build_result and\
-                         install1_result, #and install2_result and\
-                         #install3_result,
-                onpass="ONOS started successfully",
-                onfail="Failed to start ONOS")
+        utilities.assert_equals( expect=main.TRUE,
+                                actual=cellFileResult and cellApplyResult and
+                                verifyCellResult and checkoutResult and
+                                pullResult and buildResult and
+                                install1Result,  # and install2Result and
+                                # install3Result,
+                                onpass="ONOS started successfully",
+                                onfail="Failed to start ONOS" )
 
-    def CASE2(self, main):
-        '''
+    def CASE2( self, main ):
+        """
         Single intent add latency
 
-        '''
+        """
         import time
         import json
         import requests
         import os
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS_ip_list = []
-        for i in range(1, 8):
-            ONOS_ip_list.append(main.params['CTRL']['ip'+str(i)])
-        
-        ONOS_user = main.params['CTRL']['user']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOSIpList = []
+        for i in range( 1, 8 ):
+            ONOSIpList.append( main.params[ 'CTRL' ][ 'ip' + str( i ) ] )
 
-        default_sw_port = main.params['CTRL']['port1']
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        #number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        num_ignore = int(main.params['TEST']['numIgnore'])
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #Timestamp keys for json metrics output
-        submit_time = main.params['JSON']['submittedTime']
-        install_time = main.params['JSON']['installedTime']
-        wdRequest_time = main.params['JSON']['wdRequestTime']
-        withdrawn_time = main.params['JSON']['withdrawnTime']
-        
+        # number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        numIgnore = int( main.params[ 'TEST' ][ 'numIgnore' ] )
+
+        # Timestamp keys for json metrics output
+        submitTime = main.params[ 'JSON' ][ 'submittedTime' ]
+        installTime = main.params[ 'JSON' ][ 'installedTime' ]
+        wdRequestTime = main.params[ 'JSON' ][ 'wdRequestTime' ]
+        withdrawnTime = main.params[ 'JSON' ][ 'withdrawnTime' ]
+
         assertion = main.TRUE
 
-        intent_add_lat_list = []
-        
-        #Distribute switches according to cluster count
-        for i in range(1, 9):
-            if cluster_count == 1:
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i), ip1=ONOS_ip_list[0],
-                    port1=default_sw_port
-                    )
-            elif cluster_count == 3:
+        intentAddLatList = []
+
+        # Distribute switches according to cluster count
+        for i in range( 1, 9 ):
+            if clusterCount == 1:
+                main.Mininet1.assignSwController(
+                    sw=str( i ), ip1=ONOSIpList[ 0 ],
+                    port1=defaultSwPort
+                )
+            elif clusterCount == 3:
                 if i < 3:
                     index = 0
                 elif i < 6 and i >= 3:
                     index = 1
                 else:
                     index = 2
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i), ip1=ONOS_ip_list[index],
-                    port1=default_sw_port
-                    )
-            elif cluster_count == 5:
+                main.Mininet1.assignSwController(
+                    sw=str( i ), ip1=ONOSIpList[ index ],
+                    port1=defaultSwPort
+                )
+            elif clusterCount == 5:
                 if i < 3:
                     index = 0
                 elif i < 5 and i >= 3:
@@ -169,947 +170,954 @@
                     index = 3
                 else:
                     index = 4
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i), ip1=ONOS_ip_list[index],
-                    port1=default_sw_port
-                    )
-            elif cluster_count == 7:
+                main.Mininet1.assignSwController(
+                    sw=str( i ), ip1=ONOSIpList[ index ],
+                    port1=defaultSwPort
+                )
+            elif clusterCount == 7:
                 if i < 6:
                     index = i
                 else:
                     index = 6
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i), ip1=ONOS_ip_list[index],
-                    port1=default_sw_port
-                    )
+                main.Mininet1.assignSwController(
+                    sw=str( i ), ip1=ONOSIpList[ index ],
+                    port1=defaultSwPort
+                )
 
-        time.sleep(10)
+        time.sleep( 10 )
 
-        main.log.report("Single intent add latency test")
+        main.log.report( "Single intent add latency test" )
 
-        devices_json_str = main.ONOS1cli.devices()
-        devices_json_obj = json.loads(devices_json_str)
-        
-        if not devices_json_obj:
-            main.log.report("Devices not discovered")
-            main.log.report("Aborting test")
+        devicesJsonStr = main.ONOS1cli.devices()
+        devicesJsonObj = json.loads( devicesJsonStr )
+
+        if not devicesJsonObj:
+            main.log.report( "Devices not discovered" )
+            main.log.report( "Aborting test" )
             main.exit()
         else:
-            main.log.info("Devices discovered successfully")
+            main.log.info( "Devices discovered successfully" )
 
-        device_id_list = []
+        deviceIdList = []
 
-        #Obtain device id list in ONOS format.
-        #They should already be in order (1,2,3,10,11,12,13, etc)
-        for device in devices_json_obj:
-            device_id_list.append(device['id'])
+        # Obtain device id list in ONOS format.
+        # They should already be in order ( 1,2,3,10,11,12,13, etc )
+        for device in devicesJsonObj:
+            deviceIdList.append( device[ 'id' ] )
 
-        for i in range(0, int(num_iter)):
-            #add_point_intent(ingr_device,  egr_device,
-            #                 ingr_port,    egr_port)
-            main.ONOS1cli.add_point_intent(
-                device_id_list[0]+"/2", device_id_list[7]+"/2")
-        
-            #Allow some time for intents to propagate
-            time.sleep(5)
-            
-            intents_str = main.ONOS1cli.intents(json_format=True)
-            intents_obj = json.loads(intents_str)
-            for intent in intents_obj:
-                if intent['state'] == "INSTALLED":
-                    main.log.info("Intent installed successfully")
-                    intent_id = intent['id']
-                    main.log.info("Intent id: "+str(intent_id))
+        for i in range( 0, int( numIter ) ):
+            # addPointIntent( ingrDevice,  egrDevice,
+            #                 ingrPort,    egrPort )
+            main.ONOS1cli.addPointIntent(
+                deviceIdList[ 0 ] + "/2", deviceIdList[ 7 ] + "/2" )
+
+            # Allow some time for intents to propagate
+            time.sleep( 5 )
+
+            intentsStr = main.ONOS1cli.intents( jsonFormat=True )
+            intentsObj = json.loads( intentsStr )
+            for intent in intentsObj:
+                if intent[ 'state' ] == "INSTALLED":
+                    main.log.info( "Intent installed successfully" )
+                    intentId = intent[ 'id' ]
+                    main.log.info( "Intent id: " + str( intentId ) )
                 else:
-                    #TODO: Add error handling
-                    main.log.info("Intent installation failed")
-                    intent_id = ""
+                    # TODO: Add error handling
+                    main.log.info( "Intent installation failed" )
+                    intentId = ""
 
-            #Obtain metrics from ONOS 1, 2, 3
-            intents_json_str_1 = main.ONOS1cli.intents_events_metrics()
-            intents_json_obj_1 = json.loads(intents_json_str_1)
-            #Parse values from the json object
-            intent_submit_1 = \
-                    intents_json_obj_1[submit_time]['value']
-            intent_install_1 = \
-                    intents_json_obj_1[install_time]['value']
-            intent_install_lat_1 = \
-                    int(intent_install_1) - int(intent_submit_1)
-            
-            if cluster_count == 3: 
-                intents_json_str_2 = main.ONOS2cli.intents_events_metrics()
-                intents_json_str_3 = main.ONOS3cli.intents_events_metrics()
-                intents_json_obj_2 = json.loads(intents_json_str_2)
-                intents_json_obj_3 = json.loads(intents_json_str_3)
-                intent_submit_2 = \
-                    intents_json_obj_2[submit_time]['value']
-                intent_submit_3 = \
-                    intents_json_obj_3[submit_time]['value']
-                intent_install_2 = \
-                    intents_json_obj_2[install_time]['value']
-                intent_install_3 = \
-                    intents_json_obj_3[install_time]['value']
-                intent_install_lat_2 = \
-                    int(intent_install_2) - int(intent_submit_2)
-                intent_install_lat_3 = \
-                    int(intent_install_3) - int(intent_submit_3)
+            # Obtain metrics from ONOS 1, 2, 3
+            intentsJsonStr1 = main.ONOS1cli.intentsEventsMetrics()
+            intentsJsonObj1 = json.loads( intentsJsonStr1 )
+            # Parse values from the json object
+            intentSubmit1 = \
+                intentsJsonObj1[ submitTime ][ 'value' ]
+            intentInstall1 = \
+                intentsJsonObj1[ installTime ][ 'value' ]
+            intentInstallLat1 = \
+                int( intentInstall1 ) - int( intentSubmit1 )
+
+            if clusterCount == 3:
+                intentsJsonStr2 = main.ONOS2cli.intentsEventsMetrics()
+                intentsJsonStr3 = main.ONOS3cli.intentsEventsMetrics()
+                intentsJsonObj2 = json.loads( intentsJsonStr2 )
+                intentsJsonObj3 = json.loads( intentsJsonStr3 )
+                intentSubmit2 = \
+                    intentsJsonObj2[ submitTime ][ 'value' ]
+                intentSubmit3 = \
+                    intentsJsonObj3[ submitTime ][ 'value' ]
+                intentInstall2 = \
+                    intentsJsonObj2[ installTime ][ 'value' ]
+                intentInstall3 = \
+                    intentsJsonObj3[ installTime ][ 'value' ]
+                intentInstallLat2 = \
+                    int( intentInstall2 ) - int( intentSubmit2 )
+                intentInstallLat3 = \
+                    int( intentInstall3 ) - int( intentSubmit3 )
             else:
-                intent_install_lat_2 = 0
-                intent_install_lat_3 = 0
+                intentInstallLat2 = 0
+                intentInstallLat3 = 0
 
-            if cluster_count == 5:
-                intents_json_str_4 = main.ONOS4cli.intents_events_metrics()
-                intents_json_str_5 = main.ONOS5cli.intents_events_metrics()
-                intents_json_obj_4 = json.loads(intents_json_str_4)
-                intents_json_obj_5 = json.loads(intents_json_str_5)
-                intent_submit_4 = \
-                    intents_json_obj_4[submit_time]['value']
-                intent_submit_5 = \
-                    intents_json_obj_5[submit_time]['value']
-                intent_install_4 = \
-                    intents_json_obj_5[install_time]['value']
-                intent_install_5 = \
-                    intents_json_obj_5[install_time]['value']
-                intent_install_lat_4 = \
-                    int(intent_install_4) - int(intent_submit_4)
-                intent_install_lat_5 = \
-                    int(intent_install_5) - int(intent_submit_5)
+            if clusterCount == 5:
+                intentsJsonStr4 = main.ONOS4cli.intentsEventsMetrics()
+                intentsJsonStr5 = main.ONOS5cli.intentsEventsMetrics()
+                intentsJsonObj4 = json.loads( intentsJsonStr4 )
+                intentsJsonObj5 = json.loads( intentsJsonStr5 )
+                intentSubmit4 = \
+                    intentsJsonObj4[ submitTime ][ 'value' ]
+                intentSubmit5 = \
+                    intentsJsonObj5[ submitTime ][ 'value' ]
+                intentInstall4 = \
+                    intentsJsonObj5[ installTime ][ 'value' ]
+                intentInstall5 = \
+                    intentsJsonObj5[ installTime ][ 'value' ]
+                intentInstallLat4 = \
+                    int( intentInstall4 ) - int( intentSubmit4 )
+                intentInstallLat5 = \
+                    int( intentInstall5 ) - int( intentSubmit5 )
             else:
-                intent_install_lat_4 = 0
-                intent_install_lat_5 = 0
+                intentInstallLat4 = 0
+                intentInstallLat5 = 0
 
-            if cluster_count == 7:
-                intents_json_str_6 = main.ONOS6cli.intents_events_metrics()
-                intents_json_str_7 = main.ONOS7cli.intents_events_metrics()
-                intents_json_obj_6 = json.loads(intents_json_str_6)
-                intents_json_obj_7 = json.loads(intents_json_str_7)
-                intent_submit_6 = \
-                    intents_json_obj_6[submit_time]['value']
-                intent_submit_7 = \
-                    intents_json_obj_6[submit_time]['value']
-                intent_install_6 = \
-                    intents_json_obj_6[install_time]['value']
-                intent_install_7 = \
-                    intents_json_obj_7[install_time]['value']
-                intent_install_lat_6 = \
-                    int(intent_install_6) - int(intent_submit_6)
-                intent_install_lat_7 = \
-                    int(intent_install_7) - int(intent_submit_7)
+            if clusterCount == 7:
+                intentsJsonStr6 = main.ONOS6cli.intentsEventsMetrics()
+                intentsJsonStr7 = main.ONOS7cli.intentsEventsMetrics()
+                intentsJsonObj6 = json.loads( intentsJsonStr6 )
+                intentsJsonObj7 = json.loads( intentsJsonStr7 )
+                intentSubmit6 = \
+                    intentsJsonObj6[ submitTime ][ 'value' ]
+                intentSubmit7 = \
+                    intentsJsonObj6[ submitTime ][ 'value' ]
+                intentInstall6 = \
+                    intentsJsonObj6[ installTime ][ 'value' ]
+                intentInstall7 = \
+                    intentsJsonObj7[ installTime ][ 'value' ]
+                intentInstallLat6 = \
+                    int( intentInstall6 ) - int( intentSubmit6 )
+                intentInstallLat7 = \
+                    int( intentInstall7 ) - int( intentSubmit7 )
             else:
-                intent_install_lat_6 = 0
-                intent_install_lat_7 = 0
+                intentInstallLat6 = 0
+                intentInstallLat7 = 0
 
-            intent_install_lat_avg = \
-                    (intent_install_lat_1 + 
-                     intent_install_lat_2 +
-                     intent_install_lat_3 +
-                     intent_install_lat_4 +
-                     intent_install_lat_5 +
-                     intent_install_lat_6 +
-                     intent_install_lat_7) / cluster_count
+            intentInstallLatAvg = \
+                ( intentInstallLat1 +
+                  intentInstallLat2 +
+                  intentInstallLat3 +
+                  intentInstallLat4 +
+                  intentInstallLat5 +
+                  intentInstallLat6 +
+                  intentInstallLat7 ) / clusterCount
 
-            main.log.info("Intent add latency avg for iteration "+str(i)+
-                    ": "+str(intent_install_lat_avg)+" ms")
+            main.log.info( "Intent add latency avg for iteration " + str( i ) +
+                           ": " + str( intentInstallLatAvg ) + " ms" )
 
-            if intent_install_lat_avg > 0.0 and \
-               intent_install_lat_avg < 1000 and i > num_ignore:
-                intent_add_lat_list.append(intent_install_lat_avg)
+            if intentInstallLatAvg > 0.0 and \
+               intentInstallLatAvg < 1000 and i > numIgnore:
+                intentAddLatList.append( intentInstallLatAvg )
             else:
-                main.log.info("Intent add latency exceeded "+
-                        "threshold. Skipping iteration "+str(i))
+                main.log.info( "Intent add latency exceeded " +
+                               "threshold. Skipping iteration " + str( i ) )
 
-            time.sleep(3)
-            
-            #TODO: Only remove intents that were installed 
+            time.sleep( 3 )
+
+            # TODO: Only remove intents that were installed
             #      in this case... Otherwise many other intents
             #      may show up distorting the results
-            main.log.info("Removing intents for next iteration")
-            json_temp = \
-                    main.ONOS1cli.intents(json_format=True)
-            json_obj_intents = json.loads(json_temp)
-            if json_obj_intents:
-                for intents in json_obj_intents:
-                    temp_id = intents['id']
-                    #main.ONOS1cli.remove_intent(temp_id)
-                    main.log.info("Removing intent id: "+
-                        str(temp_id))
-                    main.ONOS1cli.remove_intent(temp_id)
+            main.log.info( "Removing intents for next iteration" )
+            jsonTemp = \
+                main.ONOS1cli.intents( jsonFormat=True )
+            jsonObjIntents = json.loads( jsonTemp )
+            if jsonObjIntents:
+                for intents in jsonObjIntents:
+                    tempId = intents[ 'id' ]
+                    # main.ONOS1cli.removeIntent( tempId )
+                    main.log.info( "Removing intent id: " +
+                                   str( tempId ) )
+                    main.ONOS1cli.removeIntent( tempId )
             else:
-                main.log.info("Intents were not installed correctly")
+                main.log.info( "Intents were not installed correctly" )
 
-            time.sleep(5)
+            time.sleep( 5 )
 
-        if intent_add_lat_list:
-            intent_add_lat_avg = sum(intent_add_lat_list) /\
-                             len(intent_add_lat_list)
+        if intentAddLatList:
+            intentAddLatAvg = sum( intentAddLatList ) /\
+                len( intentAddLatList )
         else:
-            main.log.report("Intent installation latency test failed")
-            intent_add_lat_avg = "NA"
+            main.log.report( "Intent installation latency test failed" )
+            intentAddLatAvg = "NA"
             assertion = main.FALSE
 
-        intent_add_lat_std = \
-            round(numpy.std(intent_add_lat_list),1)
-        #END ITERATION FOR LOOP
-        main.log.report("Single intent add latency - ")
-        main.log.report("Avg: "+str(intent_add_lat_avg)+" ms")
-        main.log.report("Std Deviation: "+str(intent_add_lat_std)+" ms")
-        
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
+        intentAddLatStd = \
+            round( numpy.std( intentAddLatList ), 1 )
+        # END ITERATION FOR LOOP
+        main.log.report( "Single intent add latency - " )
+        main.log.report( "Avg: " + str( intentAddLatAvg ) + " ms" )
+        main.log.report( "Std Deviation: " + str( intentAddLatStd ) + " ms" )
+
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=assertion,
             onpass="Single intent install latency test successful",
-            onfail="Single intent install latency test failed")
+            onfail="Single intent install latency test failed" )
 
-    def CASE3(self, main):
-        '''
+    def CASE3( self, main ):
+        """
         Intent Reroute latency
-        '''
+        """
         import time
         import json
         import requests
         import os
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS_user = main.params['CTRL']['user']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        default_sw_port = main.params['CTRL']['port1']
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        num_ignore = int(main.params['TEST']['numIgnore'])
+        # number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        numIgnore = int( main.params[ 'TEST' ][ 'numIgnore' ] )
         assertion = main.TRUE
 
-        #Timestamp keys for json metrics output
-        submit_time = main.params['JSON']['submittedTime']
-        install_time = main.params['JSON']['installedTime']
-        wdRequest_time = main.params['JSON']['wdRequestTime']
-        withdrawn_time = main.params['JSON']['withdrawnTime']
+        # Timestamp keys for json metrics output
+        submitTime = main.params[ 'JSON' ][ 'submittedTime' ]
+        installTime = main.params[ 'JSON' ][ 'installedTime' ]
+        wdRequestTime = main.params[ 'JSON' ][ 'wdRequestTime' ]
+        withdrawnTime = main.params[ 'JSON' ][ 'withdrawnTime' ]
 
-        #NOTE: May need to configure interface depending on topology
-        intfs = main.params['TEST']['intfs']
+        # NOTE: May need to configure interface depending on topology
+        intfs = main.params[ 'TEST' ][ 'intfs' ]
 
-        devices_json_str = main.ONOS1cli.devices()
-        devices_json_obj = json.loads(devices_json_str)
+        devicesJsonStr = main.ONOS1cli.devices()
+        devicesJsonObj = json.loads( devicesJsonStr )
 
-        device_id_list = []
+        deviceIdList = []
 
-        #Obtain device id list in ONOS format.
-        #They should already be in order (1,2,3,10,11,12,13, etc)
-        for device in devices_json_obj:
-            device_id_list.append(device['id'])
+        # Obtain device id list in ONOS format.
+        # They should already be in order ( 1,2,3,10,11,12,13, etc )
+        for device in devicesJsonObj:
+            deviceIdList.append( device[ 'id' ] )
 
-        intent_reroute_lat_list = []
+        intentRerouteLatList = []
 
-        for i in range(0, int(num_iter)):
-            #add_point_intent(ingr_device, ingr_port, 
-            #                 egr_device, egr_port)
-            if len(device_id_list) > 0:
-                main.ONOS1cli.add_point_intent(
-                    device_id_list[0]+"/2", device_id_list[7]+"/2")
+        for i in range( 0, int( numIter ) ):
+            # addPointIntent( ingrDevice, ingrPort,
+            #                 egrDevice, egrPort )
+            if len( deviceIdList ) > 0:
+                main.ONOS1cli.addPointIntent(
+                    deviceIdList[ 0 ] + "/2", deviceIdList[ 7 ] + "/2" )
             else:
-                main.log.info("Failed to fetch devices from ONOS")
+                main.log.info( "Failed to fetch devices from ONOS" )
 
-            time.sleep(5)
+            time.sleep( 5 )
 
-            intents_str = main.ONOS1cli.intents(json_format=True)
-            intents_obj = json.loads(intents_str)
-            for intent in intents_obj:
-                if intent['state'] == "INSTALLED":
-                    main.log.info("Intent installed successfully")
-                    intent_id = intent['id']
-                    main.log.info("Intent id: "+str(intent_id))
+            intentsStr = main.ONOS1cli.intents( jsonFormat=True )
+            intentsObj = json.loads( intentsStr )
+            for intent in intentsObj:
+                if intent[ 'state' ] == "INSTALLED":
+                    main.log.info( "Intent installed successfully" )
+                    intentId = intent[ 'id' ]
+                    main.log.info( "Intent id: " + str( intentId ) )
                 else:
-                    #TODO: Add error handling
-                    main.log.info("Intent installation failed")
-                    intent_id = ""
-            
-            main.log.info("Disabling interface "+intfs)
-            t0_system = time.time()*1000
+                    # TODO: Add error handling
+                    main.log.info( "Intent installation failed" )
+                    intentId = ""
+
+            main.log.info( "Disabling interface " + intfs )
+            t0System = time.time() * 1000
             main.Mininet1.handle.sendline(
-                    "sh ifconfig "+intfs+" down")
-            main.Mininet1.handle.expect("mininet>")    
+                "sh ifconfig " + intfs + " down" )
+            main.Mininet1.handle.expect( "mininet>" )
 
-            #TODO: Check for correct intent reroute
-            time.sleep(1)
+            # TODO: Check for correct intent reroute
+            time.sleep( 1 )
 
-            #Obtain metrics from ONOS 1, 2, 3
-            intents_json_str_1 = main.ONOS1cli.intents_events_metrics()
-            intents_json_obj_1 = json.loads(intents_json_str_1)
-            #Parse values from the json object
-            intent_install_1 = \
-                    intents_json_obj_1[install_time]['value']
-            intent_reroute_lat_1 = \
-                    int(intent_install_1) - int(t0_system)
-            
-            if cluster_count == 3:
-                intents_json_str_2 = main.ONOS2cli.intents_events_metrics()
-                intents_json_str_3 = main.ONOS3cli.intents_events_metrics()
+            # Obtain metrics from ONOS 1, 2, 3
+            intentsJsonStr1 = main.ONOS1cli.intentsEventsMetrics()
+            intentsJsonObj1 = json.loads( intentsJsonStr1 )
+            # Parse values from the json object
+            intentInstall1 = \
+                intentsJsonObj1[ installTime ][ 'value' ]
+            intentRerouteLat1 = \
+                int( intentInstall1 ) - int( t0System )
 
-                intents_json_obj_2 = json.loads(intents_json_str_2)
-                intents_json_obj_3 = json.loads(intents_json_str_3)
-                intent_install_2 = \
-                    intents_json_obj_2[install_time]['value']
-                intent_install_3 = \
-                    intents_json_obj_3[install_time]['value']
-                intent_reroute_lat_2 = \
-                    int(intent_install_2) - int(t0_system)
-                intent_reroute_lat_3 = \
-                    int(intent_install_3) - int(t0_system)
+            if clusterCount == 3:
+                intentsJsonStr2 = main.ONOS2cli.intentsEventsMetrics()
+                intentsJsonStr3 = main.ONOS3cli.intentsEventsMetrics()
+
+                intentsJsonObj2 = json.loads( intentsJsonStr2 )
+                intentsJsonObj3 = json.loads( intentsJsonStr3 )
+                intentInstall2 = \
+                    intentsJsonObj2[ installTime ][ 'value' ]
+                intentInstall3 = \
+                    intentsJsonObj3[ installTime ][ 'value' ]
+                intentRerouteLat2 = \
+                    int( intentInstall2 ) - int( t0System )
+                intentRerouteLat3 = \
+                    int( intentInstall3 ) - int( t0System )
             else:
-                intent_reroute_lat_2 = 0
-                intent_reroute_lat_3 = 0
+                intentRerouteLat2 = 0
+                intentRerouteLat3 = 0
 
-            if cluster_count == 5:
-                intents_json_str_4 = main.ONOS4cli.intents_events_metrics()
-                intents_json_str_5 = main.ONOS5cli.intents_events_metrics()
+            if clusterCount == 5:
+                intentsJsonStr4 = main.ONOS4cli.intentsEventsMetrics()
+                intentsJsonStr5 = main.ONOS5cli.intentsEventsMetrics()
 
-                intents_json_obj_4 = json.loads(intents_json_str_4)
-                intents_json_obj_5 = json.loads(intents_json_str_5)
-                intent_install_4 = \
-                    intents_json_obj_4[install_time]['value']
-                intent_install_5 = \
-                    intents_json_obj_5[install_time]['value']
-                intent_reroute_lat_4 = \
-                    int(intent_install_4) - int(t0_system)
-                intent_reroute_lat_5 = \
-                    int(intent_install_5) - int(t0_system)
+                intentsJsonObj4 = json.loads( intentsJsonStr4 )
+                intentsJsonObj5 = json.loads( intentsJsonStr5 )
+                intentInstall4 = \
+                    intentsJsonObj4[ installTime ][ 'value' ]
+                intentInstall5 = \
+                    intentsJsonObj5[ installTime ][ 'value' ]
+                intentRerouteLat4 = \
+                    int( intentInstall4 ) - int( t0System )
+                intentRerouteLat5 = \
+                    int( intentInstall5 ) - int( t0System )
             else:
-                intent_reroute_lat_4 = 0
-                intent_reroute_lat_5 = 0
+                intentRerouteLat4 = 0
+                intentRerouteLat5 = 0
 
-            if cluster_count == 7:
-                intents_json_str_6 = main.ONOS6cli.intents_events_metrics()
-                intents_json_str_7 = main.ONOS7cli.intents_events_metrics()
+            if clusterCount == 7:
+                intentsJsonStr6 = main.ONOS6cli.intentsEventsMetrics()
+                intentsJsonStr7 = main.ONOS7cli.intentsEventsMetrics()
 
-                intents_json_obj_6 = json.loads(intents_json_str_6)
-                intents_json_obj_7 = json.loads(intents_json_str_7)
-                intent_install_6 = \
-                    intents_json_obj_6[install_time]['value']
-                intent_install_7 = \
-                    intents_json_obj_7[install_time]['value']
-                intent_reroute_lat_6 = \
-                    int(intent_install_6) - int(t0_system)
-                intent_reroute_lat_7 = \
-                    int(intent_install_7) - int(t0_system)
+                intentsJsonObj6 = json.loads( intentsJsonStr6 )
+                intentsJsonObj7 = json.loads( intentsJsonStr7 )
+                intentInstall6 = \
+                    intentsJsonObj6[ installTime ][ 'value' ]
+                intentInstall7 = \
+                    intentsJsonObj7[ installTime ][ 'value' ]
+                intentRerouteLat6 = \
+                    int( intentInstall6 ) - int( t0System )
+                intentRerouteLat7 = \
+                    int( intentInstall7 ) - int( t0System )
             else:
-                intent_reroute_lat_6 = 0
-                intent_reroute_lat_7 = 0
+                intentRerouteLat6 = 0
+                intentRerouteLat7 = 0
 
-            intent_reroute_lat_avg = \
-                    (intent_reroute_lat_1 + 
-                     intent_reroute_lat_2 +
-                     intent_reroute_lat_3 +
-                     intent_reroute_lat_4 +
-                     intent_reroute_lat_5 +
-                     intent_reroute_lat_6 +
-                     intent_reroute_lat_7) / cluster_count 
-    
-            main.log.info("Intent reroute latency avg for iteration "+
-                    str(i)+": "+str(intent_reroute_lat_avg))
+            intentRerouteLatAvg = \
+                ( intentRerouteLat1 +
+                  intentRerouteLat2 +
+                  intentRerouteLat3 +
+                  intentRerouteLat4 +
+                  intentRerouteLat5 +
+                  intentRerouteLat6 +
+                  intentRerouteLat7 ) / clusterCount
 
-            if intent_reroute_lat_avg > 0.0 and \
-               intent_reroute_lat_avg < 1000 and i > num_ignore:
-                intent_reroute_lat_list.append(intent_reroute_lat_avg)
+            main.log.info( "Intent reroute latency avg for iteration " +
+                           str( i ) + ": " + str( intentRerouteLatAvg ) )
+
+            if intentRerouteLatAvg > 0.0 and \
+               intentRerouteLatAvg < 1000 and i > numIgnore:
+                intentRerouteLatList.append( intentRerouteLatAvg )
             else:
-                main.log.info("Intent reroute latency exceeded "+
-                        "threshold. Skipping iteration "+str(i))
+                main.log.info( "Intent reroute latency exceeded " +
+                               "threshold. Skipping iteration " + str( i ) )
 
-            main.log.info("Removing intents for next iteration")
-            main.ONOS1cli.remove_intent(intent_id)
+            main.log.info( "Removing intents for next iteration" )
+            main.ONOS1cli.removeIntent( intentId )
 
-            main.log.info("Bringing Mininet interface up for next "+
-                "iteration")
+            main.log.info( "Bringing Mininet interface up for next " +
+                           "iteration" )
             main.Mininet1.handle.sendline(
-                    "sh ifconfig "+intfs+" up")
-            main.Mininet1.handle.expect("mininet>")
+                "sh ifconfig " + intfs + " up" )
+            main.Mininet1.handle.expect( "mininet>" )
 
-        if intent_reroute_lat_list:
-            intent_reroute_lat_avg = sum(intent_reroute_lat_list) /\
-                             len(intent_reroute_lat_list)
+        if intentRerouteLatList:
+            intentRerouteLatAvg = sum( intentRerouteLatList ) /\
+                len( intentRerouteLatList )
         else:
-            main.log.report("Intent reroute test failed. Results NA")
-            intent_reroute_lat_avg = "NA" 
-            #NOTE: fails test when list is empty
+            main.log.report( "Intent reroute test failed. Results NA" )
+            intentRerouteLatAvg = "NA"
+            # NOTE: fails test when list is empty
             assertion = main.FALSE
-        
-        intent_reroute_lat_std = \
-            round(numpy.std(intent_reroute_lat_list),1)
-        #END ITERATION FOR LOOP
-        main.log.report("Single intent reroute latency - ")
-        main.log.report("Avg: "+str(intent_reroute_lat_avg)+" ms")
-        main.log.report("Std Deviation: "+str(intent_reroute_lat_std)+" ms")
-       
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
+
+        intentRerouteLatStd = \
+            round( numpy.std( intentRerouteLatList ), 1 )
+        # END ITERATION FOR LOOP
+        main.log.report( "Single intent reroute latency - " )
+        main.log.report( "Avg: " + str( intentRerouteLatAvg ) + " ms" )
+        main.log.report(
+            "Std Deviation: " +
+            str( intentRerouteLatStd ) +
+            " ms" )
+
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=assertion,
             onpass="Single intent reroute latency test successful",
-            onfail="Single intent reroute latency test failed")
-        
-    def CASE4(self, main):
-        '''
+            onfail="Single intent reroute latency test failed" )
+
+    def CASE4( self, main ):
+        """
         Batch intent install
-        '''
-        
+        """
         import time
         import json
         import requests
         import os
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS4_ip = main.params['CTRL']['ip4']
-        ONOS5_ip = main.params['CTRL']['ip5']
-        ONOS6_ip = main.params['CTRL']['ip6']
-        ONOS7_ip = main.params['CTRL']['ip7']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ]
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ]
 
         assertion = main.TRUE
 
-        ONOS_ip_list = []
-        for i in range(1, 8):
-            ONOS_ip_list.append(main.params['CTRL']['ip'+str(i)])
+        ONOSIpList = []
+        for i in range( 1, 8 ):
+            ONOSIpList.append( main.params[ 'CTRL' ][ 'ip' + str( i ) ] )
 
-        ONOS_user = main.params['CTRL']['user']
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        default_sw_port = main.params['CTRL']['port1']
-    
-        batch_intent_size = main.params['TEST']['batchIntentSize']
-        batch_thresh_min = int(main.params['TEST']['batchThresholdMin'])
-        batch_thresh_max = int(main.params['TEST']['batchThresholdMax'])
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        num_ignore = int(main.params['TEST']['numIgnore'])
-        num_switch = int(main.params['TEST']['numSwitch'])
-        n_thread = main.params['TEST']['numMult']
-        #n_thread = 105
+        batchIntentSize = int( main.params[ 'TEST' ][ 'batchIntentSize' ] )
+        batchThreshMin = int( main.params[ 'TEST' ][ 'batchThresholdMin' ] )
+        batchThreshMax = int( main.params[ 'TEST' ][ 'batchThresholdMax' ] )
 
-        #Switch assignment NOTE: hardcoded 
-        if cluster_count == 1:
-            for i in range(1, num_switch+1):
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i), 
-                    ip1=ONOS1_ip,
-                    port1=default_sw_port)
-        if cluster_count == 3:
-            for i in range(1, 3):
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i),
-                    ip1=ONOS1_ip,
-                    port1=default_sw_port)
-            for i in range(3, 6):
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i),
-                    ip1=ONOS2_ip,
-                    port1=default_sw_port)
-            for i in range(6, 9):
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i),
-                    ip1=ONOS3_ip,
-                    port1=default_sw_port)
-        if cluster_count == 5:
-            main.Mininet1.assign_sw_controller(
-                    sw="1",
-                    ip1=ONOS1_ip,
-                    port1=default_sw_port)
-            main.Mininet1.assign_sw_controller(
-                    sw="2",
-                    ip1=ONOS2_ip,
-                    port1=default_sw_port)
-            for i in range(3, 6):
-                main.Mininet1.assign_sw_controller(
-                    sw=str(i),
-                    ip1=ONOS3_ip,
-                    port1=default_sw_port)
-            main.Mininet1.assign_sw_controller(
-                    sw="6",
-                    ip1=ONOS4_ip,
-                    port1=default_sw_port)
-            main.Mininet1.assign_sw_controller(
-                    sw="7",
-                    ip1=ONOS5_ip,
-                    port1=default_sw_port)
-            main.Mininet1.assign_sw_controller(
-                    sw="8",
-                    ip1=ONOS5_ip,
-                    port1=default_sw_port)
-        
-        if cluster_count == 7:
-            for i in range(1,9):
+        # number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        numIgnore = int( main.params[ 'TEST' ][ 'numIgnore' ] )
+        numSwitch = int( main.params[ 'TEST' ][ 'numSwitch' ] )
+        nThread = main.params[ 'TEST' ][ 'numMult' ]
+        #nThread = 105
+
+        # Switch assignment NOTE: hardcoded
+        if clusterCount == 1:
+            for i in range( 1, numSwitch + 1 ):
+                main.Mininet1.assignSwController(
+                    sw=str( i ),
+                    ip1=ONOS1Ip,
+                    port1=defaultSwPort )
+        if clusterCount == 3:
+            for i in range( 1, 3 ):
+                main.Mininet1.assignSwController(
+                    sw=str( i ),
+                    ip1=ONOS1Ip,
+                    port1=defaultSwPort )
+            for i in range( 3, 6 ):
+                main.Mininet1.assignSwController(
+                    sw=str( i ),
+                    ip1=ONOS2Ip,
+                    port1=defaultSwPort )
+            for i in range( 6, 9 ):
+                main.Mininet1.assignSwController(
+                    sw=str( i ),
+                    ip1=ONOS3Ip,
+                    port1=defaultSwPort )
+        if clusterCount == 5:
+            main.Mininet1.assignSwController(
+                sw="1",
+                ip1=ONOS1Ip,
+                port1=defaultSwPort )
+            main.Mininet1.assignSwController(
+                sw="2",
+                ip1=ONOS2Ip,
+                port1=defaultSwPort )
+            for i in range( 3, 6 ):
+                main.Mininet1.assignSwController(
+                    sw=str( i ),
+                    ip1=ONOS3Ip,
+                    port1=defaultSwPort )
+            main.Mininet1.assignSwController(
+                sw="6",
+                ip1=ONOS4Ip,
+                port1=defaultSwPort )
+            main.Mininet1.assignSwController(
+                sw="7",
+                ip1=ONOS5Ip,
+                port1=defaultSwPort )
+            main.Mininet1.assignSwController(
+                sw="8",
+                ip1=ONOS5Ip,
+                port1=defaultSwPort )
+
+        if clusterCount == 7:
+            for i in range( 1, 9 ):
                 if i < 8:
-                    main.Mininet1.assign_sw_controller(
-                        sw=str(i),
-                        ip1=ONOS_ip_list[i-1],
-                        port1=default_sw_port)
-                elif i >= 8: 
-                    main.Mininet1.assign_sw_controller(
-                        sw=str(i),
-                        ip1=ONOS_ip_list[6],
-                        port1=default_sw_port)
+                    main.Mininet1.assignSwController(
+                        sw=str( i ),
+                        ip1=ONOSIpList[ i - 1 ],
+                        port1=defaultSwPort )
+                elif i >= 8:
+                    main.Mininet1.assignSwController(
+                        sw=str( i ),
+                        ip1=ONOSIpList[ 6 ],
+                        port1=defaultSwPort )
 
-        time.sleep(20)
+        time.sleep( 20 )
 
-        main.log.report("Batch intent installation test of "+
-               batch_intent_size +" intent(s)")
+        main.log.report( "Batch intent installation test of " +
+                         str( batchIntentSize ) + " intent(s)" )
 
-        batch_result_list = []
+        batchResultList = []
 
-        main.log.info("Getting list of available devices")
-        device_id_list = []
-        json_str = main.ONOS1cli.devices()
-        json_obj = json.loads(json_str)
-        for device in json_obj:
-            device_id_list.append(device['id'])
+        main.log.info( "Getting list of available devices" )
+        deviceIdList = []
+        jsonStr = main.ONOS1cli.devices()
+        jsonObj = json.loads( jsonStr )
+        for device in jsonObj:
+            deviceIdList.append( device[ 'id' ] )
 
-        batch_install_lat = []
-        batch_withdraw_lat = []
-        
-        #Max intent install measurement of all nodes
-        max_install_lat = []
-        max_withdraw_lat = []
-        sleep_time = 10
-        
-        base_dir = "/tmp/"
+        batchInstallLat = []
+        batchWithdrawLat = []
 
-        for batch in range(0, 5):
-            for i in range(0, int(num_iter)):
-                main.log.info("Pushing "+
-                    str(int(batch_intent_size)*int(n_thread))+
-                    " intents. Iteration "+str(i))
-               
-                for node in range(1, cluster_count+1):
-                    save_dir = base_dir + "batch_intent_"+str(node)+".txt" 
-                    main.ONOSbench.push_test_intents_shell(
-                    device_id_list[0]+"/2",
-                    device_id_list[7]+"/2",
-                    int(batch_intent_size),
-                    save_dir, ONOS_ip_list[node-1],
-                    num_mult=n_thread, app_id=node)
-         
-                #Wait sufficient time for intents to start
-                #installing
-                time.sleep(sleep_time)
+        # Max intent install measurement of all nodes
+        maxInstallLat = []
+        maxWithdrawLat = []
+        sleepTime = 10
+
+        baseDir = "/tmp/"
+
+        for batch in range( 0, 5 ):
+            for i in range( 0, int( numIter ) ):
+                main.log.info( "Pushing " +
+                               str( int( batchIntentSize ) * int( nThread ) ) +
+                               " intents. Iteration " + str( i ) )
+
+                for node in range( 1, clusterCount + 1 ):
+                    saveDir = baseDir + "batch_intent_" + str( node ) + ".txt"
+                    main.ONOSbench.pushTestIntentsShell(
+                        deviceIdList[ 0 ] + "/2",
+                        deviceIdList[ 7 ] + "/2",
+                        batchIntentSize,
+                        saveDir, ONOSIpList[ node - 1 ],
+                        numMult=nThread, appId=node )
+
+                # Wait sufficient time for intents to start
+                # installing
+                time.sleep( sleepTime )
 
                 intent = ""
                 counter = 300
-                while len(intent) > 0 and counter > 0:
+                while len( intent ) > 0 and counter > 0:
                     main.ONOS1cli.handle.sendline(
-                        "intents | wc -l")
+                        "intents | wc -l" )
                     main.ONOS1cli.handle.expect(
-                        "intents | wc -l")
+                        "intents | wc -l" )
                     main.ONOS1cli.handle.expect(
-                        "onos>")
-                    intent_temp = main.ONOS1cli.handle.before()
+                        "onos>" )
+                    intentTemp = main.ONOS1cli.handle.before()
                     intent = main.ONOS1cli.intents()
-                    intent = json.loads(intent)
-                    counter = counter-1
-                    time.sleep(1)
+                    intent = json.loads( intent )
+                    counter = counter - 1
+                    time.sleep( 1 )
 
-                time.sleep(5)
+                time.sleep( 5 )
 
-                for node in range(1, cluster_count+1):
-                    save_dir = base_dir + "batch_intent_"+str(node)+".txt"
-                    with open(save_dir) as f_onos:
-                        line_count = 0
-                        for line in f_onos:
-                            line = line[1:]
-                            line = line.split(": ")
-                            main.log.info("Line read: "+str(line))
-                            result = line[1].split(" ")[0]
-                            #TODO: add parameters before appending latency
-                            if line_count == 0:
-                                batch_install_lat.append(int(result))
-                                install_result = result
-                            elif line_count == 1:
-                                batch_withdraw_lat.append(int(result))
-                                withdraw_result = result
-                            line_count += 1
-                    main.log.info("Batch install latency for ONOS"+
-                        str(node)+" with "+\
-                        str(batch_intent_size) + "intents: "+\
-                        str(install_result)+" ms")
-                    main.log.info("Batch withdraw latency for ONOS"+
-                        str(node)+" with "+
-                        str(batch_intent_size) + "intents: "+
-                        str(withdraw_result)+" ms")
+                for node in range( 1, clusterCount + 1 ):
+                    saveDir = baseDir + "batch_intent_" + str( node ) + ".txt"
+                    with open( saveDir ) as fOnos:
+                        lineCount = 0
+                        for line in fOnos:
+                            line = line[ 1: ]
+                            line = line.split( ": " )
+                            main.log.info( "Line read: " + str( line ) )
+                            result = line[ 1 ].split( " " )[ 0 ]
+                            # TODO: add parameters before appending latency
+                            if lineCount == 0:
+                                batchInstallLat.append( int( result ) )
+                                installResult = result
+                            elif lineCount == 1:
+                                batchWithdrawLat.append( int( result ) )
+                                withdrawResult = result
+                            lineCount += 1
+                    main.log.info( "Batch install latency for ONOS" +
+                                   str( node ) + " with " +
+                                   str( batchIntentSize ) + "intents: " +
+                                   str( installResult ) + " ms" )
+                    main.log.info( "Batch withdraw latency for ONOS" +
+                                   str( node ) + " with " +
+                                   str( batchIntentSize ) + "intents: " +
+                                   str( withdrawResult ) + " ms" )
 
-                if len(batch_install_lat) > 0 and int(i) > num_ignore:
-                    max_install_lat.append(max(batch_install_lat))
-                elif len(batch_install_lat) == 0:
-                    #If I failed to read anything from the file,
-                    #increase the wait time before checking intents
-                    sleep_time += 30
-                if len(batch_withdraw_lat) > 0 and int(i) > num_ignore:
-                    max_withdraw_lat.append(max(batch_withdraw_lat))
-                batch_install_lat = []
-                batch_withdraw_lat = []
-    
-                #Sleep in between iterations
-                time.sleep(5)
-            
-            if max_install_lat:
-                avg_install_lat = str(sum(max_install_lat) /\
-                                  len(max_install_lat))
+                if len( batchInstallLat ) > 0 and int( i ) > numIgnore:
+                    maxInstallLat.append( max( batchInstallLat ) )
+                elif len( batchInstallLat ) == 0:
+                    # If I failed to read anything from the file,
+                    # increase the wait time before checking intents
+                    sleepTime += 30
+                if len( batchWithdrawLat ) > 0 and int( i ) > numIgnore:
+                    maxWithdrawLat.append( max( batchWithdrawLat ) )
+                batchInstallLat = []
+                batchWithdrawLat = []
+
+                # Sleep in between iterations
+                time.sleep( 5 )
+
+            if maxInstallLat:
+                avgInstallLat = str( sum( maxInstallLat ) /
+                                      len( maxInstallLat ) )
             else:
-                avg_install_lat = "NA"
-                main.log.report("Batch installation failed")
+                avgInstallLat = "NA"
+                main.log.report( "Batch installation failed" )
                 assertion = main.FALSE
 
-            if max_withdraw_lat:
-                avg_withdraw_lat = str(sum(max_withdraw_lat) /\
-                                   len(max_withdraw_lat))
+            if maxWithdrawLat:
+                avgWithdrawLat = str( sum( maxWithdrawLat ) /
+                                       len( maxWithdrawLat ) )
             else:
-                avg_withdraw_lat = "NA"
-                main.log.report("Batch withdraw failed")
+                avgWithdrawLat = "NA"
+                main.log.report( "Batch withdraw failed" )
                 assertion = main.FALSE
 
-            main.log.report("Avg of batch installation latency "+
-                "of size "+batch_intent_size+": "+
-                str(avg_install_lat)+" ms")
-            main.log.report("Std Deviation of batch installation latency "+
-                ": "+str(numpy.std(max_install_lat))+" ms")
+            main.log.report( "Avg of batch installation latency " +
+                             "of size " + str( batchIntentSize ) + ": " +
+                             str( avgInstallLat ) + " ms" )
+            main.log.report( "Std Deviation of batch installation latency " +
+                             ": " + str( numpy.std( maxInstallLat ) ) + " ms" )
 
-            main.log.report("Avg of batch withdraw latency "+
-                "of size "+batch_intent_size+": "+
-                str(avg_withdraw_lat)+" ms")
-            main.log.report("Std Deviation of batch withdraw latency "+
-                ": "+str(numpy.std(max_withdraw_lat))+" ms")
-           
-            batch_intent_size += 1000
-            main.log.report("Increasing batch intent size to "+
-                             batch_intent_size)
-           
-        #main.log.info("Removing all intents for next test case")
-        #json_temp = main.ONOS1cli.intents(json_format=True)
-        #json_obj_intents = json.loads(json_temp)
-        #if json_obj_intents:
-        #    for intents in json_obj_intents:
-        #        temp_id = intents['id']
-                #main.ONOS1cli.remove_intent(temp_id)
-        #        main.ONOS1cli.remove_intent(temp_id)
-        
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
+            main.log.report( "Avg of batch withdraw latency " +
+                             "of size " + str( batchIntentSize ) + ": " +
+                             str( avgWithdrawLat ) + " ms" )
+            main.log.report( "Std Deviation of batch withdraw latency " +
+                             ": " +
+                             str( numpy.std( maxWithdrawLat ) ) +
+                             " ms" )
+
+            batchIntentSize = batchIntentSize + 1000
+            main.log.report( "Increasing batch intent size to " +
+                             str(batchIntentSize) )
+
+        #main.log.info( "Removing all intents for next test case" )
+        #jsonTemp = main.ONOS1cli.intents( jsonFormat=True )
+        #jsonObjIntents = json.loads( jsonTemp )
+        # if jsonObjIntents:
+        #    for intents in jsonObjIntents:
+        #        tempId = intents[ 'id' ]
+            # main.ONOS1cli.removeIntent( tempId )
+        #        main.ONOS1cli.removeIntent( tempId )
+
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=assertion,
             onpass="Batch intent install/withdraw test successful",
-            onfail="Batch intent install/withdraw test failed")
+            onfail="Batch intent install/withdraw test failed" )
 
-    def CASE5(self,main):
-        '''
+    def CASE5( self, main ):
+        """
         Increase number of nodes and initiate CLI
-        '''
+        """
         import time
         import json
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS4_ip = main.params['CTRL']['ip4']
-        ONOS5_ip = main.params['CTRL']['ip5']
-        ONOS6_ip = main.params['CTRL']['ip6']
-        ONOS7_ip = main.params['CTRL']['ip7']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ]
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ]
 
-        global cluster_count
-        cluster_count += 2
-        main.log.report("Increasing cluster size to "+
-                str(cluster_count))
+        global clusterCount
+        clusterCount += 2
+        main.log.report( "Increasing cluster size to " +
+                         str( clusterCount ) )
 
-        install_result = main.FALSE
+        installResult = main.FALSE
 
-        if cluster_count == 3:
-            install_result1 = \
-                main.ONOSbench.onos_install(node=ONOS2_ip)
-            install_result2 = \
-                main.ONOSbench.onos_install(node=ONOS3_ip)
-            time.sleep(5)
+        if clusterCount == 3:
+            installResult1 = \
+                main.ONOSbench.onosInstall( node=ONOS2Ip )
+            installResult2 = \
+                main.ONOSbench.onosInstall( node=ONOS3Ip )
+            time.sleep( 5 )
 
-            main.log.info("Starting ONOS CLI")
-            main.ONOS2cli.start_onos_cli(ONOS2_ip)
-            main.ONOS3cli.start_onos_cli(ONOS3_ip)
+            main.log.info( "Starting ONOS CLI" )
+            main.ONOS2cli.startOnosCli( ONOS2Ip )
+            main.ONOS3cli.startOnosCli( ONOS3Ip )
 
-            install_result = install_result1 and install_result2
+            installResult = installResult1 and installResult2
 
-        if cluster_count == 5:
-            main.log.info("Installing ONOS on node 4 and 5")
-            install_result1 = \
-                main.ONOSbench.onos_install(node=ONOS4_ip)
-            install_result2 = \
-                main.ONOSbench.onos_install(node=ONOS5_ip)
+        if clusterCount == 5:
+            main.log.info( "Installing ONOS on node 4 and 5" )
+            installResult1 = \
+                main.ONOSbench.onosInstall( node=ONOS4Ip )
+            installResult2 = \
+                main.ONOSbench.onosInstall( node=ONOS5Ip )
 
-            main.log.info("Starting ONOS CLI")
-            main.ONOS4cli.start_onos_cli(ONOS4_ip)
-            main.ONOS5cli.start_onos_cli(ONOS5_ip)
+            main.log.info( "Starting ONOS CLI" )
+            main.ONOS4cli.startOnosCli( ONOS4Ip )
+            main.ONOS5cli.startOnosCli( ONOS5Ip )
 
-            install_result = install_result1 and install_result2
+            installResult = installResult1 and installResult2
 
-        if cluster_count == 7:
-            main.log.info("Installing ONOS on node 6 and 7")
-            install_result1 = \
-                main.ONOSbench.onos_install(node=ONOS6_ip)
-            install_result2 = \
-                main.ONOSbench.onos_install(node=ONOS7_ip)
+        if clusterCount == 7:
+            main.log.info( "Installing ONOS on node 6 and 7" )
+            installResult1 = \
+                main.ONOSbench.onosInstall( node=ONOS6Ip )
+            installResult2 = \
+                main.ONOSbench.onosInstall( node=ONOS7Ip )
 
-            main.log.info("Starting ONOS CLI")
-            main.ONOS6cli.start_onos_cli(ONOS6_ip)
-            main.ONOS7cli.start_onos_cli(ONOS7_ip)
+            main.log.info( "Starting ONOS CLI" )
+            main.ONOS6cli.startOnosCli( ONOS6Ip )
+            main.ONOS7cli.startOnosCli( ONOS7Ip )
 
-            install_result = install_result1 and install_result2
+            installResult = installResult1 and installResult2
 
-        time.sleep(5)
+        time.sleep( 5 )
 
-        if install_result == main.TRUE:
+        if installResult == main.TRUE:
             assertion = main.TRUE
         else:
             assertion = main.FALSE
 
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
-            onpass="Scale out to "+str(cluster_count)+\
-                   " nodes successful",
-            onfail="Scale out to "+str(cluster_count)+\
-                   " nodes failed")
-    
-    def CASE7(self, main):
-        #TODO: Fix for scale-out scenario
+        utilities.assert_equals( expect=main.TRUE, actual=assertion,
+                                onpass="Scale out to " + str( clusterCount ) +
+                                " nodes successful",
+                                onfail="Scale out to " + str( clusterCount ) +
+                                " nodes failed" )
 
-        '''
+    def CASE7( self, main ):
+        # TODO: Fix for scale-out scenario
+        """
         Batch intent reroute latency
-        '''
+        """
         import time
         import json
         import requests
         import os
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS_ip_list = []
-        for i in range(1, 8):
-            ONOS_ip_list.append(main.params['CTRL']['ip'+str(i)])
+        ONOSIpList = []
+        for i in range( 1, 8 ):
+            ONOSIpList.append( main.params[ 'CTRL' ][ 'ip' + str( i ) ] )
 
-        ONOS_user = main.params['CTRL']['user']
-        default_sw_port = main.params['CTRL']['port1']
-    
-        batch_intent_size = main.params['TEST']['batchIntentSize']
-        batch_thresh_min = int(main.params['TEST']['batchThresholdMin'])
-        batch_thresh_max = int(main.params['TEST']['batchThresholdMax'])
-        intfs = main.params['TEST']['intfs']
-        install_time = main.params['JSON']['installedTime']
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        num_ignore = int(main.params['TEST']['numIgnore'])
-        num_switch = int(main.params['TEST']['numSwitch'])
-        n_thread = main.params['TEST']['numMult']
+        batchIntentSize = main.params[ 'TEST' ][ 'batchIntentSize' ]
+        batchThreshMin = int( main.params[ 'TEST' ][ 'batchThresholdMin' ] )
+        batchThreshMax = int( main.params[ 'TEST' ][ 'batchThresholdMax' ] )
+        intfs = main.params[ 'TEST' ][ 'intfs' ]
+        installTime = main.params[ 'JSON' ][ 'installedTime' ]
 
-        main.log.report("Batch intent installation test of "+
-               batch_intent_size +" intents")
+        # number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        numIgnore = int( main.params[ 'TEST' ][ 'numIgnore' ] )
+        numSwitch = int( main.params[ 'TEST' ][ 'numSwitch' ] )
+        nThread = main.params[ 'TEST' ][ 'numMult' ]
 
-        batch_result_list = []
+        main.log.report( "Batch intent installation test of " +
+                         batchIntentSize + " intents" )
 
-        time.sleep(10)
+        batchResultList = []
 
-        main.log.info("Getting list of available devices")
-        device_id_list = []
-        json_str = main.ONOS1cli.devices()
-        json_obj = json.loads(json_str)
-        for device in json_obj:
-            device_id_list.append(device['id'])
+        time.sleep( 10 )
 
-        batch_install_lat = []
-        batch_withdraw_lat = []
-        sleep_time = 10
-        
-        base_dir = "/tmp/"
-        max_install_lat = []
+        main.log.info( "Getting list of available devices" )
+        deviceIdList = []
+        jsonStr = main.ONOS1cli.devices()
+        jsonObj = json.loads( jsonStr )
+        for device in jsonObj:
+            deviceIdList.append( device[ 'id' ] )
 
-        for i in range(0, int(num_iter)):
-            main.log.info("Pushing "+
-                    str(int(batch_intent_size)*int(n_thread))+
-                    " intents. Iteration "+str(i))
+        batchInstallLat = []
+        batchWithdrawLat = []
+        sleepTime = 10
 
-            main.ONOSbench.push_test_intents_shell(
-                device_id_list[0]+"/2",
-                device_id_list[7]+"/2",
-                batch_intent_size, "/tmp/batch_install.txt",
-                ONOS_ip_list[0], num_mult="1", app_id="1",
-                report=False, options="--install")
-            #main.ONOSbench.push_test_intents_shell(
+        baseDir = "/tmp/"
+        maxInstallLat = []
+
+        for i in range( 0, int( numIter ) ):
+            main.log.info( "Pushing " +
+                           str( int( batchIntentSize ) * int( nThread ) ) +
+                           " intents. Iteration " + str( i ) )
+
+            main.ONOSbench.pushTestIntentsShell(
+                deviceIdList[ 0 ] + "/2",
+                deviceIdList[ 7 ] + "/2",
+                batchIntentSize, "/tmp/batch_install.txt",
+                ONOSIpList[ 0 ], numMult="1", appId="1",
+                report=False, options="--install" )
+            # main.ONOSbench.pushTestIntentsShell(
             #    "of:0000000000001002/1",
             #    "of:0000000000002002/1",
             #    133, "/tmp/temp2.txt", "10.128.174.2",
-            #    num_mult="6", app_id="2",report=False)
-               
-            #TODO: Check for installation success then proceed
-            time.sleep(30)
-            
-            #NOTE: this interface is specific to
+            #    numMult="6", appId="2",report=False )
+
+            # TODO: Check for installation success then proceed
+            time.sleep( 30 )
+
+            # NOTE: this interface is specific to
             #      topo-intentFlower.py topology
             #      reroute case.
-            main.log.info("Disabling interface "+intfs)
+            main.log.info( "Disabling interface " + intfs )
             main.Mininet1.handle.sendline(
-                    "sh ifconfig "+intfs+" down")
-            t0_system = time.time()*1000
+                "sh ifconfig " + intfs + " down" )
+            t0System = time.time() * 1000
 
-            #TODO: Wait sufficient time for intents to install
-            time.sleep(10)
+            # TODO: Wait sufficient time for intents to install
+            time.sleep( 10 )
 
-            #TODO: get intent installation time
-            
-            #Obtain metrics from ONOS 1, 2, 3
-            intents_json_str_1 = main.ONOS1cli.intents_events_metrics()
-            intents_json_obj_1 = json.loads(intents_json_str_1)
-            #Parse values from the json object
-            intent_install_1 = \
-                    intents_json_obj_1[install_time]['value']
-            intent_reroute_lat_1 = \
-                    int(intent_install_1) - int(t0_system)
-            
-            
-            if cluster_count == 3: 
-                intents_json_str_2 =\
-                    main.ONOS2cli.intents_events_metrics()
-                intents_json_str_3 =\
-                    main.ONOS3cli.intents_events_metrics()
-                intents_json_obj_2 = json.loads(intents_json_str_2)
-                intents_json_obj_3 = json.loads(intents_json_str_3)
-                intent_install_2 = \
-                    intents_json_obj_2[install_time]['value']
-                intent_install_3 = \
-                    intents_json_obj_3[install_time]['value']
-                intent_reroute_lat_2 = \
-                    int(intent_install_2) - int(t0_system)
-                intent_reroute_lat_3 = \
-                    int(intent_install_3) - int(t0_system)
+            # TODO: get intent installation time
+
+            # Obtain metrics from ONOS 1, 2, 3
+            intentsJsonStr1 = main.ONOS1cli.intentsEventsMetrics()
+            intentsJsonObj1 = json.loads( intentsJsonStr1 )
+            # Parse values from the json object
+            intentInstall1 = \
+                intentsJsonObj1[ installTime ][ 'value' ]
+            intentRerouteLat1 = \
+                int( intentInstall1 ) - int( t0System )
+
+            if clusterCount == 3:
+                intentsJsonStr2 =\
+                    main.ONOS2cli.intentsEventsMetrics()
+                intentsJsonStr3 =\
+                    main.ONOS3cli.intentsEventsMetrics()
+                intentsJsonObj2 = json.loads( intentsJsonStr2 )
+                intentsJsonObj3 = json.loads( intentsJsonStr3 )
+                intentInstall2 = \
+                    intentsJsonObj2[ installTime ][ 'value' ]
+                intentInstall3 = \
+                    intentsJsonObj3[ installTime ][ 'value' ]
+                intentRerouteLat2 = \
+                    int( intentInstall2 ) - int( t0System )
+                intentRerouteLat3 = \
+                    int( intentInstall3 ) - int( t0System )
             else:
-                intent_reroute_lat_2 = 0
-                intent_reroute_lat_3 = 0
+                intentRerouteLat2 = 0
+                intentRerouteLat3 = 0
 
-            if cluster_count == 5:
-                intents_json_str_4 =\
-                    main.ONOS4cli.intents_events_metrics()
-                intents_json_str_5 =\
-                    main.ONOS5cli.intents_events_metrics()
-                intents_json_obj_4 = json.loads(intents_json_str_4)
-                intents_json_obj_5 = json.loads(intents_json_str_5)
-                intent_install_4 = \
-                    intents_json_obj_4[install_time]['value']
-                intent_install_5 = \
-                    intents_json_obj_5[install_time]['value']
-                intent_reroute_lat_4 = \
-                    int(intent_install_4) - int(t0_system)
-                intent_reroute_lat_5 = \
-                    int(intent_install_5) - int(t0_system)
+            if clusterCount == 5:
+                intentsJsonStr4 =\
+                    main.ONOS4cli.intentsEventsMetrics()
+                intentsJsonStr5 =\
+                    main.ONOS5cli.intentsEventsMetrics()
+                intentsJsonObj4 = json.loads( intentsJsonStr4 )
+                intentsJsonObj5 = json.loads( intentsJsonStr5 )
+                intentInstall4 = \
+                    intentsJsonObj4[ installTime ][ 'value' ]
+                intentInstall5 = \
+                    intentsJsonObj5[ installTime ][ 'value' ]
+                intentRerouteLat4 = \
+                    int( intentInstall4 ) - int( t0System )
+                intentRerouteLat5 = \
+                    int( intentInstall5 ) - int( t0System )
             else:
-                intent_reroute_lat_4 = 0
-                intent_reroute_lat_5 = 0
+                intentRerouteLat4 = 0
+                intentRerouteLat5 = 0
 
-            if cluster_count == 7:
-                intents_json_str_6 =\
-                    main.ONOS6cli.intents_events_metrics()
-                intents_json_str_7 =\
-                    main.ONOS7cli.intents_events_metrics()
-                intents_json_obj_6 = json.loads(intents_json_str_6)
-                intents_json_obj_7 = json.loads(intents_json_str_7)
-                intent_install_6 = \
-                    intents_json_obj_6[install_time]['value']
-                intent_install_7 = \
-                    intents_json_obj_7[install_time]['value']
-                intent_reroute_lat_6 = \
-                    int(intent_install_6) - int(t0_system)
-                intent_reroute_lat_7 = \
-                    int(intent_install_7) - int(t0_system)
+            if clusterCount == 7:
+                intentsJsonStr6 =\
+                    main.ONOS6cli.intentsEventsMetrics()
+                intentsJsonStr7 =\
+                    main.ONOS7cli.intentsEventsMetrics()
+                intentsJsonObj6 = json.loads( intentsJsonStr6 )
+                intentsJsonObj7 = json.loads( intentsJsonStr7 )
+                intentInstall6 = \
+                    intentsJsonObj6[ installTime ][ 'value' ]
+                intentInstall7 = \
+                    intentsJsonObj7[ installTime ][ 'value' ]
+                intentRerouteLat6 = \
+                    int( intentInstall6 ) - int( t0System )
+                intentRerouteLat7 = \
+                    int( intentInstall7 ) - int( t0System )
             else:
-                intent_reroute_lat_6 = 0
-                intent_reroute_lat_7 = 0
+                intentRerouteLat6 = 0
+                intentRerouteLat7 = 0
 
-            intent_reroute_lat_avg = \
-                    (intent_reroute_lat_1 + 
-                     intent_reroute_lat_2 +
-                     intent_reroute_lat_3 +
-                     intent_reroute_lat_4 + 
-                     intent_reroute_lat_5 +
-                     intent_reroute_lat_6 +
-                     intent_reroute_lat_7) / cluster_count 
-    
-            main.log.info("Intent reroute latency avg for iteration "+
-                    str(i)+": "+str(intent_reroute_lat_avg))
-            #TODO: Remove intents for next iteration
-            
-            time.sleep(5)
+            intentRerouteLatAvg = \
+                ( intentRerouteLat1 +
+                  intentRerouteLat2 +
+                  intentRerouteLat3 +
+                  intentRerouteLat4 +
+                  intentRerouteLat5 +
+                  intentRerouteLat6 +
+                  intentRerouteLat7 ) / clusterCount
 
-            intents_str = main.ONOS1cli.intents()
-            intents_json = json.loads(intents_str)
-            for intents in intents_json:
-                intent_id = intents['id']
-                #TODO: make sure this removes all intents
-                #print intent_id
-                if intent_id:
-                    main.ONOS1cli.remove_intent(intent_id)
+            main.log.info( "Intent reroute latency avg for iteration " +
+                           str( i ) + ": " + str( intentRerouteLatAvg ) )
+            # TODO: Remove intents for next iteration
+
+            time.sleep( 5 )
+
+            intentsStr = main.ONOS1cli.intents()
+            intentsJson = json.loads( intentsStr )
+            for intents in intentsJson:
+                intentId = intents[ 'id' ]
+                # TODO: make sure this removes all intents
+                # print intentId
+                if intentId:
+                    main.ONOS1cli.removeIntent( intentId )
 
             main.Mininet1.handle.sendline(
-                    "sh ifconfig "+intfs+" up")
-            
-            main.log.info("Intents removed and port back up")
+                "sh ifconfig " + intfs + " up" )
 
-    def CASE9(self, main):
+            main.log.info( "Intents removed and port back up" )
+
+    def CASE9( self, main ):
         count = 0
-        sw_num1 = 1 
-        sw_num2 = 1
+        swNum1 = 1
+        swNum2 = 1
         appid = 0
-        port_num1 = 1
-        port_num2 = 1
-       
-        time.sleep(30)
+        portNum1 = 1
+        portNum2 = 1
+
+        time.sleep( 30 )
 
         while True:
-            #main.ONOS1cli.push_test_intents(
+            # main.ONOS1cli.pushTestIntents(
                     #"of:0000000000001001/1",
                 #"of:0000000000002001/1",
-                #    100, num_mult="10", app_id="1")
-            #main.ONOS2cli.push_test_intents(
+                #    100, numMult="10", appId="1" )
+            # main.ONOS2cli.pushTestIntents(
             #    "of:0000000000001002/1",
             #    "of:0000000000002002/1",
-            #    100, num_mult="10", app_id="2")
-            #main.ONOS2cli.push_test_intents(
+            #    100, numMult="10", appId="2" )
+            # main.ONOS2cli.pushTestIntents(
             #    "of:0000000000001003/1",
             #    "of:0000000000002003/1",
-            #    100, num_mult="10", app_id="3")
+            #    100, numMult="10", appId="3" )
             count += 1
-           
+
             if count >= 100:
                 main.ONOSbench.handle.sendline(
-                    "onos 10.128.174.1 intents-events-metrics >>"+\
-                    " /tmp/metrics_intents_temp.txt &")
+                    "onos 10.128.174.1 intents-events-metrics >>" +
+                    " /tmp/metrics_intents_temp.txt &" )
                 count = 0
 
-            arg1 = "of:000000000000100"+str(sw_num1)+"/"+str(port_num1)
-            arg2 = "of:000000000000200"+str(sw_num2)+"/"+str(port_num2)
-            
-            sw_num1 += 1
+            arg1 = "of:000000000000100" + str( swNum1 ) + "/" + str( portNum1 )
+            arg2 = "of:000000000000200" + str( swNum2 ) + "/" + str( portNum2 )
 
-            if sw_num1 > 7:
-                sw_num1 = 1
-                sw_num2 += 1
-                if sw_num2 > 7:
+            swNum1 += 1
+
+            if swNum1 > 7:
+                swNum1 = 1
+                swNum2 += 1
+                if swNum2 > 7:
                     appid += 1
 
-            if sw_num2 > 7:
-                sw_num2 = 1
-            
-            main.ONOSbench.push_test_intents_shell(
+            if swNum2 > 7:
+                swNum2 = 1
+
+            main.ONOSbench.pushTestIntentsShell(
                 arg1,
-                arg2, 
+                arg2,
                 100, "/tmp/temp.txt", "10.128.174.1",
-                num_mult="10", app_id=appid,report=False)
-            #main.ONOSbench.push_test_intents_shell(
+                numMult="10", appId=appid, report=False )
+            # main.ONOSbench.pushTestIntentsShell(
             #    "of:0000000000001002/1",
             #    "of:0000000000002002/1",
             #    133, "/tmp/temp2.txt", "10.128.174.2",
-            #    num_mult="6", app_id="2",report=False)
-            #main.ONOSbench.push_test_intents_shell(
+            #    numMult="6", appId="2",report=False )
+            # main.ONOSbench.pushTestIntentsShell(
             #    "of:0000000000001003/1",
             #    "of:0000000000002003/1",
             #    133, "/tmp/temp3.txt", "10.128.174.3",
-            #    num_mult="6", app_id="3",report=False)
-   
-            time.sleep(0.2)
+            #    numMult="6", appId="3",report=False )
 
+            time.sleep( 0.2 )
diff --git a/TestON/tests/TopoPerfNext/TopoPerfNext.params b/TestON/tests/TopoPerfNext/TopoPerfNext.params
index 8e31e62..45de48d 100644
--- a/TestON/tests/TopoPerfNext/TopoPerfNext.params
+++ b/TestON/tests/TopoPerfNext/TopoPerfNext.params
@@ -42,16 +42,17 @@
         #pcap file located at /tmp/'capture_name'
         <debugMode>off</debugMode>
         <onosLogFile>/opt/onos/log/karaf*</onosLogFile>
+        <mci>off</mci>
 
-        <topo_config_file>
+        <topoConfigFile>
         single_topo_event_accumulator.cfg
-        </topo_config_file>
-        <topo_config_name>
+        </topoConfigFile>
+        <topoConfigName>
         org.onlab.onos.net.topology.impl.DefaultTopologyProvider.cfg
-        </topo_config_name>
+        </topoConfigName>
 
         #Number of times to iterate each case
-        <numIter>12</numIter>
+        <numIter>5</numIter>
         <numSwitch>2</numSwitch>
         #Number of iterations to ignore initially
         <iterIgnore>2</iterIgnore>
diff --git a/TestON/tests/TopoPerfNext/TopoPerfNext.py b/TestON/tests/TopoPerfNext/TopoPerfNext.py
index b737f4c..12e53e5 100644
--- a/TestON/tests/TopoPerfNext/TopoPerfNext.py
+++ b/TestON/tests/TopoPerfNext/TopoPerfNext.py
@@ -1,1931 +1,1951 @@
-#TopoPerfNext
+# TopoPerfNext
 #
-#Topology Performance test for ONOS-next
+# Topology Performance test for ONOS-next
 #
-#andrew@onlab.us
+# andrew@onlab.us
 #
-#If your machine does not come with numpy
-#run the following command:
-#sudo apt-get install python-numpy python-scipy 
+# If your machine does not come with numpy
+# run the following command:
+# sudo apt-get install python-numpy python-scipy
 
 import time
 import sys
 import os
 import re
 
+
 class TopoPerfNext:
-    def __init__(self):
+
+    def __init__( self ):
         self.default = ''
 
-    def CASE1(self, main):
-        '''
+    def CASE1( self, main ):
+        """
         ONOS startup sequence
-        '''
+        """
         import time
-        
-        ## Global cluster count for scale-out purposes
-        global cluster_count
-        #Set initial cluster count
-        cluster_count = 1 
+
+        # Global cluster count for scale-out purposes
+        global clusterCount
+        # Set initial cluster count
+        clusterCount = 1
         ##
 
-        cell_name = main.params['ENV']['cellName']
+        cellName = main.params[ 'ENV' ][ 'cellName' ]
 
-        git_pull = main.params['GIT']['autoPull']
-        checkout_branch = main.params['GIT']['checkout']
+        gitPull = main.params[ 'GIT' ][ 'autoPull' ]
+        checkoutBranch = main.params[ 'GIT' ][ 'checkout' ]
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ] 
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ] 
+
+        MN1Ip = main.params[ 'MN' ][ 'ip1' ]
+        BENCHIp = main.params[ 'BENCH' ][ 'ip' ]
+
+        topoCfgFile = main.params[ 'TEST' ][ 'topoConfigFile' ]
+        topoCfgName = main.params[ 'TEST' ][ 'topoConfigName' ]
+
+        mvnCleanInstall = main.params[ 'TEST' ][ 'mci' ]
         
-        #### Hardcoded ONOS nodes particular to my env ####
-        ONOS4_ip = "10.128.174.4"
-        ONOS5_ip = "10.128.174.5"
-        ONOS6_ip = "10.128.174.6"
-        ONOS7_ip = "10.128.174.7"
-        #### ####
+        main.case( "Setting up test environment" )
+        main.log.info( "Copying topology event accumulator config" +
+                       " to ONOS /package/etc" )
+        main.ONOSbench.handle.sendline( "cp ~/" +
+                                        topoCfgFile +
+                                        " ~/ONOS/tools/package/etc/" +
+                                        topoCfgName )
+        main.ONOSbench.handle.expect( "\$" )
 
-        MN1_ip = main.params['MN']['ip1']
-        BENCH_ip = main.params['BENCH']['ip']
+        main.log.report( "Setting up test environment" )
 
-        topo_cfg_file = main.params['TEST']['topo_config_file']
-        topo_cfg_name = main.params['TEST']['topo_config_name']
-        
-        main.case("Setting up test environment")
-        main.log.info("Copying topology event accumulator config"+\
-            " to ONOS /package/etc")
-        main.ONOSbench.handle.sendline("cp ~/"+\
-            topo_cfg_file+\
-            " ~/ONOS/tools/package/etc/"+\
-            topo_cfg_name)
-        main.ONOSbench.handle.expect("\$")
+        main.step( "Cleaning previously installed ONOS if any" )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS2Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS3Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS4Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS5Ip )
+        main.ONOSbench.onosUninstall( nodeIp=ONOS6Ip )
+        #main.ONOSbench.onosUninstall( nodeIp=ONOS7Ip )
 
-        main.log.report("Setting up test environment")
+        main.step( "Creating cell file" )
+        cellFileResult = main.ONOSbench.createCellFile(
+            BENCHIp, cellName, MN1Ip,
+            "onos-core,onos-app-metrics,onos-app-gui",
+            ONOS1Ip )
 
-        main.step("Cleaning previously installed ONOS if any")
-        main.ONOSbench.onos_uninstall(node_ip=ONOS2_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS3_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS4_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS5_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS6_ip)
-        main.ONOSbench.onos_uninstall(node_ip=ONOS7_ip)
+        main.step( "Applying cell file to environment" )
+        cellApplyResult = main.ONOSbench.setCell( cellName )
+        verifyCellResult = main.ONOSbench.verifyCell()
 
-        main.step("Creating cell file")
-        cell_file_result = main.ONOSbench.create_cell_file(
-                BENCH_ip, cell_name, MN1_ip, 
-                "onos-core,onos-app-metrics,onos-app-gui",
-                ONOS1_ip)
-
-        main.step("Applying cell file to environment")
-        cell_apply_result = main.ONOSbench.set_cell(cell_name)
-        verify_cell_result = main.ONOSbench.verify_cell()
-        
-        #NOTE: This step may be removed after proper 
+        # NOTE: This step may be removed after proper
         #      copy cat log functionality
-        main.step("Removing raft/copy-cat logs from ONOS nodes")
-        main.ONOSbench.onos_remove_raft_logs()
-        time.sleep(30)
+        main.step( "Removing raft/copy-cat logs from ONOS nodes" )
+        main.ONOSbench.onosRemoveRaftLogs()
+        time.sleep( 30 )
 
-        main.step("Git checkout and pull "+checkout_branch)
-        if git_pull == 'on':
-            #checkout_result = \
-                    #        main.ONOSbench.git_checkout(checkout_branch)
-            checkout_result = main.TRUE
-            pull_result = main.ONOSbench.git_pull()
+        main.step( "Git checkout and pull " + checkoutBranch )
+        if gitPull == 'on':
+            # checkoutResult = \
+                    #        main.ONOSbench.gitCheckout( checkoutBranch )
+            checkoutResult = main.TRUE
+            pullResult = main.ONOSbench.gitPull()
         else:
-            checkout_result = main.TRUE
-            pull_result = main.TRUE
-            main.log.info("Skipped git checkout and pull")
+            checkoutResult = main.TRUE
+            pullResult = main.TRUE
+            main.log.info( "Skipped git checkout and pull" )
 
-        main.log.report("Commit information - ")
-        main.ONOSbench.get_version(report=True)
+        main.log.report( "Commit information - " )
+        main.ONOSbench.getVersion( report=True )
 
-        main.step("Using mvn clean & install")
-        mvn_result = main.ONOSbench.clean_install()
-        mvn_result = main.TRUE
+        main.step( "Using mvn clean & install" )
+        if mvnCleanInstall == 'on':
+            mvnResult = main.ONOSbench.cleanInstall()
+        elif mvnCleanInstall == 'off':
+            main.log.info("mci turned off by settings")
+            mvnResult = main.TRUE
 
-        main.step("Set cell for ONOS cli env")
-        main.ONOS1cli.set_cell(cell_name)
-        #main.ONOS2cli.set_cell(cell_name)
-        #main.ONOS3cli.set_cell(cell_name)
+        main.step( "Set cell for ONOS cli env" )
+        main.ONOS1cli.setCell( cellName )
+        # main.ONOS2cli.setCell( cellName )
+        # main.ONOS3cli.setCell( cellName )
 
-        main.step("Creating ONOS package")
-        package_result = main.ONOSbench.onos_package()
+        main.step( "Creating ONOS package" )
+        packageResult = main.ONOSbench.onosPackage()
 
-        main.step("Installing ONOS package")
-        install1_result = main.ONOSbench.onos_install(node=ONOS1_ip)
-        #install2_result = main.ONOSbench.onos_install(node=ONOS2_ip)
-        #install3_result = main.ONOSbench.onos_install(node=ONOS3_ip)
+        main.step( "Installing ONOS package" )
+        install1Result = main.ONOSbench.onosInstall( node=ONOS1Ip )
+        #install2Result = main.ONOSbench.onosInstall( node=ONOS2Ip )
+        #install3Result = main.ONOSbench.onosInstall( node=ONOS3Ip )
 
-        time.sleep(10)
+        time.sleep( 10 )
 
-        main.step("Start onos cli")
-        cli1 = main.ONOS1cli.start_onos_cli(ONOS1_ip)
-        #cli2 = main.ONOS2cli.start_onos_cli(ONOS2_ip)
-        #cli3 = main.ONOS3cli.start_onos_cli(ONOS3_ip)
+        main.step( "Start onos cli" )
+        cli1 = main.ONOS1cli.startOnosCli( ONOS1Ip )
+        #cli2 = main.ONOS2cli.startOnosCli( ONOS2Ip )
+        #cli3 = main.ONOS3cli.startOnosCli( ONOS3Ip )
 
-        utilities.assert_equals(expect=main.TRUE,
-                actual= cell_file_result and cell_apply_result and\
-                        verify_cell_result and checkout_result and\
-                        pull_result and mvn_result and\
-                        install1_result, #and install2_result and\
-                        #install3_result,
-                onpass="Test Environment setup successful",
-                onfail="Failed to setup test environment")
+        utilities.assert_equals( expect=main.TRUE,
+                                actual=cellFileResult and cellApplyResult and
+                                verifyCellResult and checkoutResult and
+                                pullResult and mvnResult and
+                                install1Result,  # and install2Result and
+                                # install3Result,
+                                onpass="Test Environment setup successful",
+                                onfail="Failed to setup test environment" )
 
-    def CASE2(self, main):
-        '''
+    def CASE2( self, main ):
+        """
         Assign s1 to ONOS1 and measure latency
-        
+
         There are 4 levels of latency measurements to this test:
-        1) End-to-end measurement: Complete end-to-end measurement
-           from TCP (SYN/ACK) handshake to Graph change
-        2) OFP-to-graph measurement: 'ONOS processing' snippet of
+        1 ) End-to-end measurement: Complete end-to-end measurement
+           from TCP ( SYN/ACK ) handshake to Graph change
+        2 ) OFP-to-graph measurement: 'ONOS processing' snippet of
            measurement from OFP Vendor message to Graph change
-        3) OFP-to-device measurement: 'ONOS processing without 
+        3 ) OFP-to-device measurement: 'ONOS processing without
            graph change' snippet of measurement from OFP vendor
            message to Device change timestamp
-        4) T0-to-device measurement: Measurement that includes
-           the switch handshake to devices timestamp without 
-           the graph view change. (TCP handshake -> Device 
-           change)
-        '''
+        4 ) T0-to-device measurement: Measurement that includes
+           the switch handshake to devices timestamp without
+           the graph view change. ( TCP handshake -> Device
+           change )
+        """
         import time
         import subprocess
         import json
         import requests
         import os
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS4_ip = main.params['CTRL']['ip4']
-        ONOS5_ip = main.params['CTRL']['ip5']
-        ONOS6_ip = main.params['CTRL']['ip6']
-        ONOS7_ip = main.params['CTRL']['ip7']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ]
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ]
 
-        ONOS_user = main.params['CTRL']['user']
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        default_sw_port = main.params['CTRL']['port1']
-       
-        #Number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        #Number of first 'x' iterations to ignore:
-        iter_ignore = int(main.params['TEST']['iterIgnore'])
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #Timestamp 'keys' for json metrics output.
-        #These are subject to change, hence moved into params
-        deviceTimestamp = main.params['JSON']['deviceTimestamp']
-        graphTimestamp = main.params['JSON']['graphTimestamp']
+        # Number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        # Number of first 'x' iterations to ignore:
+        iterIgnore = int( main.params[ 'TEST' ][ 'iterIgnore' ] )
 
-        debug_mode = main.params['TEST']['debugMode']
-        onos_log = main.params['TEST']['onosLogFile']
+        # Timestamp 'keys' for json metrics output.
+        # These are subject to change, hence moved into params
+        deviceTimestamp = main.params[ 'JSON' ][ 'deviceTimestamp' ]
+        graphTimestamp = main.params[ 'JSON' ][ 'graphTimestamp' ]
 
-        #Threshold for the test
-        threshold_str = main.params['TEST']['singleSwThreshold']
-        threshold_obj = threshold_str.split(",")
-        threshold_min = int(threshold_obj[0])
-        threshold_max = int(threshold_obj[1])
+        debugMode = main.params[ 'TEST' ][ 'debugMode' ]
+        onosLog = main.params[ 'TEST' ][ 'onosLogFile' ]
 
-        #List of switch add latency collected from
-        #all iterations
-        latency_end_to_end_list = []
-        latency_ofp_to_graph_list = []
-        latency_ofp_to_device_list = []
-        latency_t0_to_device_list = []
-        latency_tcp_to_ofp_list = []
+        # Threshold for the test
+        thresholdStr = main.params[ 'TEST' ][ 'singleSwThreshold' ]
+        thresholdObj = thresholdStr.split( "," )
+        thresholdMin = int( thresholdObj[ 0 ] )
+        thresholdMax = int( thresholdObj[ 1 ] )
 
-        #Directory/file to store tshark results
-        tshark_of_output = "/tmp/tshark_of_topo.txt"
-        tshark_tcp_output = "/tmp/tshark_tcp_topo.txt"
+        # List of switch add latency collected from
+        # all iterations
+        latencyEndToEndList = []
+        latencyOfpToGraphList = []
+        latencyOfpToDeviceList = []
+        latencyT0ToDeviceList = []
+        latencyTcpToOfpList = []
 
-        #String to grep in tshark output
-        tshark_tcp_string = "TCP 74 "+default_sw_port
-        tshark_of_string = "OFP 86 Vendor"
-     
-        #Initialize assertion to TRUE
+        # Directory/file to store tshark results
+        tsharkOfOutput = "/tmp/tshark_of_topo.txt"
+        tsharkTcpOutput = "/tmp/tshark_tcp_topo.txt"
+
+        # String to grep in tshark output
+        tsharkTcpString = "TCP 74 " + defaultSwPort
+        tsharkOfString = "OFP 86 Vendor"
+
+        # Initialize assertion to TRUE
         assertion = main.TRUE
-      
-        local_time = time.strftime('%x %X')
-        local_time = local_time.replace("/","")
-        local_time = local_time.replace(" ","_")
-        local_time = local_time.replace(":","")
-        if debug_mode == 'on':
-            main.ONOS1.tshark_pcap("eth0",
-                    "/tmp/single_sw_lat_pcap_"+local_time) 
 
-            main.log.info("Debug mode is on")
+        localTime = time.strftime( '%x %X' )
+        localTime = localTime.replace( "/", "" )
+        localTime = localTime.replace( " ", "_" )
+        localTime = localTime.replace( ":", "" )
+        if debugMode == 'on':
+            main.ONOS1.tsharkPcap( "eth0",
+                                   "/tmp/single_sw_lat_pcap_" + localTime )
 
-        main.log.report("Latency of adding one switch to controller")
-        main.log.report("First "+str(iter_ignore)+" iterations ignored"+
-                " for jvm warmup time")
-        main.log.report("Total iterations of test: "+str(num_iter))
+            main.log.info( "Debug mode is on" )
 
-        for i in range(0, int(num_iter)):
-            main.log.info("Starting tshark capture")
+        main.log.report( "Latency of adding one switch to controller" )
+        main.log.report( "First " + str( iterIgnore ) + " iterations ignored" +
+                         " for jvm warmup time" )
+        main.log.report( "Total iterations of test: " + str( numIter ) )
 
-            #* TCP [ACK, SYN] is used as t0_a, the
-            #  very first "exchange" between ONOS and 
+        for i in range( 0, int( numIter ) ):
+            main.log.info( "Starting tshark capture" )
+
+            #* TCP [ ACK, SYN ] is used as t0A, the
+            #  very first "exchange" between ONOS and
             #  the switch for end-to-end measurement
-            #* OFP [Stats Reply] is used for t0_b
+            #* OFP [ Stats Reply ] is used for t0B
             #  the very last OFP message between ONOS
             #  and the switch for ONOS measurement
-            main.ONOS1.tshark_grep(tshark_tcp_string,
-                    tshark_tcp_output)
-            main.ONOS1.tshark_grep(tshark_of_string,
-                    tshark_of_output)
+            main.ONOS1.tsharkGrep( tsharkTcpString,
+                                   tsharkTcpOutput )
+            main.ONOS1.tsharkGrep( tsharkOfString,
+                                   tsharkOfOutput )
 
-            #Wait and ensure tshark is started and 
-            #capturing
-            time.sleep(10)
+            # Wait and ensure tshark is started and
+            # capturing
+            time.sleep( 10 )
 
-            main.log.info("Assigning s1 to controller")
+            main.log.info( "Assigning s1 to controller" )
 
-            main.Mininet1.assign_sw_controller(sw="1",
-                    ip1=ONOS1_ip, port1=default_sw_port)
+            main.Mininet1.assignSwController(
+                sw="1",
+                ip1=ONOS1Ip,
+                port1=defaultSwPort )
 
-            #Wait and ensure switch is assigned
-            #before stopping tshark
-            time.sleep(30)
-   
-            main.log.info("Stopping all Tshark processes")
-            main.ONOS1.stop_tshark()
+            # Wait and ensure switch is assigned
+            # before stopping tshark
+            time.sleep( 30 )
 
-            #tshark output is saved in ONOS. Use subprocess
-            #to copy over files to TestON for parsing
-            main.log.info("Copying over tshark files")
-            
-            #TCP CAPTURE ****
-            #Copy the tshark output from ONOS machine to
-            #TestON machine in tshark_tcp_output directory>file
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_tcp_output+" /tmp/") 
-            tcp_file = open(tshark_tcp_output, 'r')
-            temp_text = tcp_file.readline()
-            temp_text = temp_text.split(" ")
+            main.log.info( "Stopping all Tshark processes" )
+            main.ONOS1.stopTshark()
 
-            main.log.info("Object read in from TCP capture: "+
-                    str(temp_text))
-            if len(temp_text) > 1:
-                t0_tcp = float(temp_text[1])*1000.0
+            # tshark output is saved in ONOS. Use subprocess
+            # to copy over files to TestON for parsing
+            main.log.info( "Copying over tshark files" )
+
+            # TCP CAPTURE ****
+            # Copy the tshark output from ONOS machine to
+            # TestON machine in tsharkTcpOutput directory>file
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkTcpOutput + " /tmp/" )
+            tcpFile = open( tsharkTcpOutput, 'r' )
+            tempText = tcpFile.readline()
+            tempText = tempText.split( " " )
+
+            main.log.info( "Object read in from TCP capture: " +
+                           str( tempText ) )
+            if len( tempText ) > 1:
+                t0Tcp = float( tempText[ 1 ] ) * 1000.0
             else:
-                main.log.error("Tshark output file for TCP"+
-                        " returned unexpected results")
-                t0_tcp = 0
+                main.log.error( "Tshark output file for TCP" +
+                                " returned unexpected results" )
+                t0Tcp = 0
                 assertion = main.FALSE
-            
-            tcp_file.close()
+
+            tcpFile.close()
             #****************
 
-            #OF CAPTURE ****
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_of_output+" /tmp/")
-            of_file = open(tshark_of_output, 'r')
-           
-            line_ofp = ""
-            #Read until last line of file
+            # OF CAPTURE ****
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkOfOutput + " /tmp/" )
+            ofFile = open( tsharkOfOutput, 'r' )
+
+            lineOfp = ""
+            # Read until last line of file
             while True:
-                temp_text = of_file.readline()
-                if temp_text !='':
-                    line_ofp = temp_text
+                tempText = ofFile.readline()
+                if tempText != '':
+                    lineOfp = tempText
                 else:
-                    break 
-            obj = line_ofp.split(" ")
-            
-            main.log.info("Object read in from OFP capture: "+
-                    str(line_ofp))
-    
-            if len(line_ofp) > 1:
-                t0_ofp = float(obj[1])*1000.0
+                    break
+            obj = lineOfp.split( " " )
+
+            main.log.info( "Object read in from OFP capture: " +
+                           str( lineOfp ) )
+
+            if len( lineOfp ) > 1:
+                t0Ofp = float( obj[ 1 ] ) * 1000.0
             else:
-                main.log.error("Tshark output file for OFP"+
-                        " returned unexpected results")
-                t0_ofp = 0
+                main.log.error( "Tshark output file for OFP" +
+                                " returned unexpected results" )
+                t0Ofp = 0
                 assertion = main.FALSE
-            
-            of_file.close()
+
+            ofFile.close()
             #****************
-           
-            json_str_1 = main.ONOS1cli.topology_events_metrics()
-            #Initialize scale-out variables 
-            json_str_2 = "" 
-            json_str_3 = ""
-            json_str_4 = ""
-            json_str_5 = ""
-            json_str_6 = ""
-            json_str_7 = ""
 
-            json_obj_1 = json.loads(json_str_1)
-            #Initialize scale-out variables
-            json_obj_2 = ""
-            json_obj_3 = "" 
-            json_obj_4 = ""
-            json_obj_5 = ""
-            json_obj_6 = ""
-            json_obj_7 = ""
-            
-            #Obtain graph timestamp. This timestsamp captures
-            #the epoch time at which the topology graph was updated.
-            graph_timestamp_1 = \
-                    json_obj_1[graphTimestamp]['value']
-            #Obtain device timestamp. This timestamp captures
-            #the epoch time at which the device event happened
-            device_timestamp_1 = \
-                    json_obj_1[deviceTimestamp]['value'] 
-           
-            #t0 to device processing latency 
-            delta_device_1 = int(device_timestamp_1) - int(t0_tcp)
-            
-            #t0 to graph processing latency (end-to-end)
-            delta_graph_1 = int(graph_timestamp_1) - int(t0_tcp)
-            
-            #ofp to graph processing latency (ONOS processing)
-            delta_ofp_graph_1 = int(graph_timestamp_1) - int(t0_ofp)
-            
-            #ofp to device processing latency (ONOS processing)
-            delta_ofp_device_1 = float(device_timestamp_1) - float(t0_ofp)
+            jsonStr1 = main.ONOS1cli.topologyEventsMetrics()
+            # Initialize scale-out variables
+            jsonStr2 = ""
+            jsonStr3 = ""
+            jsonStr4 = ""
+            jsonStr5 = ""
+            jsonStr6 = ""
+            jsonStr7 = ""
 
-            #TODO: Create even cluster number events
+            jsonObj1 = json.loads( jsonStr1 )
+            # Initialize scale-out variables
+            jsonObj2 = ""
+            jsonObj3 = ""
+            jsonObj4 = ""
+            jsonObj5 = ""
+            jsonObj6 = ""
+            jsonObj7 = ""
 
-            #Include scale-out measurements when applicable
-            if cluster_count >= 3:
-                json_str_2 = main.ONOS2cli.topology_events_metrics()
-                json_str_3 = main.ONOS3cli.topology_events_metrics()
-                json_obj_2 = json.loads(json_str_2)
-                json_obj_3 = json.loads(json_str_3)
-                graph_timestamp_2 = \
-                    json_obj_2[graphTimestamp]['value']
-                graph_timestamp_3 = \
-                    json_obj_3[graphTimestamp]['value']
-                device_timestamp_2 = \
-                    json_obj_2[deviceTimestamp]['value'] 
-                device_timestamp_3 = \
-                    json_obj_3[deviceTimestamp]['value'] 
-                delta_device_2 = int(device_timestamp_2) - int(t0_tcp)
-                delta_device_3 = int(device_timestamp_3) - int(t0_tcp)
-                delta_graph_2 = int(graph_timestamp_2) - int(t0_tcp)
-                delta_graph_3 = int(graph_timestamp_3) - int(t0_tcp)
-                delta_ofp_graph_2 = int(graph_timestamp_2) - int(t0_ofp)
-                delta_ofp_graph_3 = int(graph_timestamp_3) - int(t0_ofp)
-                delta_ofp_device_2 = float(device_timestamp_2) -\
-                        float(t0_ofp)
-                delta_ofp_device_3 = float(device_timestamp_3) -\
-                        float(t0_ofp)
+            # Obtain graph timestamp. This timestsamp captures
+            # the epoch time at which the topology graph was updated.
+            graphTimestamp1 = \
+                jsonObj1[ graphTimestamp ][ 'value' ]
+            # Obtain device timestamp. This timestamp captures
+            # the epoch time at which the device event happened
+            deviceTimestamp1 = \
+                jsonObj1[ deviceTimestamp ][ 'value' ]
+
+            # t0 to device processing latency
+            deltaDevice1 = int( deviceTimestamp1 ) - int( t0Tcp )
+
+            # t0 to graph processing latency ( end-to-end )
+            deltaGraph1 = int( graphTimestamp1 ) - int( t0Tcp )
+
+            # ofp to graph processing latency ( ONOS processing )
+            deltaOfpGraph1 = int( graphTimestamp1 ) - int( t0Ofp )
+
+            # ofp to device processing latency ( ONOS processing )
+            deltaOfpDevice1 = float( deviceTimestamp1 ) - float( t0Ofp )
+
+            # TODO: Create even cluster number events
+
+            # Include scale-out measurements when applicable
+            if clusterCount >= 3:
+                jsonStr2 = main.ONOS2cli.topologyEventsMetrics()
+                jsonStr3 = main.ONOS3cli.topologyEventsMetrics()
+                jsonObj2 = json.loads( jsonStr2 )
+                jsonObj3 = json.loads( jsonStr3 )
+                graphTimestamp2 = \
+                    jsonObj2[ graphTimestamp ][ 'value' ]
+                graphTimestamp3 = \
+                    jsonObj3[ graphTimestamp ][ 'value' ]
+                deviceTimestamp2 = \
+                    jsonObj2[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp3 = \
+                    jsonObj3[ deviceTimestamp ][ 'value' ]
+                deltaDevice2 = int( deviceTimestamp2 ) - int( t0Tcp )
+                deltaDevice3 = int( deviceTimestamp3 ) - int( t0Tcp )
+                deltaGraph2 = int( graphTimestamp2 ) - int( t0Tcp )
+                deltaGraph3 = int( graphTimestamp3 ) - int( t0Tcp )
+                deltaOfpGraph2 = int( graphTimestamp2 ) - int( t0Ofp )
+                deltaOfpGraph3 = int( graphTimestamp3 ) - int( t0Ofp )
+                deltaOfpDevice2 = float( deviceTimestamp2 ) -\
+                    float( t0Ofp )
+                deltaOfpDevice3 = float( deviceTimestamp3 ) -\
+                    float( t0Ofp )
             else:
-                delta_device_2 = 0
-                delta_device_3 = 0
-                delta_graph_2 = 0
-                delta_graph_3 = 0
-                delta_ofp_graph_2 = 0
-                delta_ofp_graph_3 = 0
-                delta_ofp_device_2 = 0
-                delta_ofp_device_3 = 0
+                deltaDevice2 = 0
+                deltaDevice3 = 0
+                deltaGraph2 = 0
+                deltaGraph3 = 0
+                deltaOfpGraph2 = 0
+                deltaOfpGraph3 = 0
+                deltaOfpDevice2 = 0
+                deltaOfpDevice3 = 0
 
-            if cluster_count >= 5:
-                json_str_4 = main.ONOS4cli.topology_events_metrics()
-                json_str_5 = main.ONOS5cli.topology_events_metrics()
-                json_obj_4 = json.loads(json_str_4)
-                json_obj_5 = json.loads(json_str_5)
-                graph_timestamp_4 = \
-                    json_obj_4[graphTimestamp]['value']
-                graph_timestamp_5 = \
-                    json_obj_5[graphTimestamp]['value']
-                device_timestamp_4 = \
-                    json_obj_4[deviceTimestamp]['value'] 
-                device_timestamp_5 = \
-                    json_obj_5[deviceTimestamp]['value'] 
-                delta_device_4 = int(device_timestamp_4) - int(t0_tcp)
-                delta_device_5 = int(device_timestamp_5) - int(t0_tcp)
-                delta_graph_4 = int(graph_timestamp_4) - int(t0_tcp)
-                delta_graph_5 = int(graph_timestamp_5) - int(t0_tcp)
-                delta_ofp_graph_4 = int(graph_timestamp_4) - int(t0_ofp)
-                delta_ofp_graph_5 = int(graph_timestamp_5) - int(t0_ofp)
-                delta_ofp_device_4 = float(device_timestamp_4) -\
-                        float(t0_ofp)
-                delta_ofp_device_5 = float(device_timestamp_5) -\
-                        float(t0_ofp)
+            if clusterCount >= 5:
+                jsonStr4 = main.ONOS4cli.topologyEventsMetrics()
+                jsonStr5 = main.ONOS5cli.topologyEventsMetrics()
+                jsonObj4 = json.loads( jsonStr4 )
+                jsonObj5 = json.loads( jsonStr5 )
+                graphTimestamp4 = \
+                    jsonObj4[ graphTimestamp ][ 'value' ]
+                graphTimestamp5 = \
+                    jsonObj5[ graphTimestamp ][ 'value' ]
+                deviceTimestamp4 = \
+                    jsonObj4[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp5 = \
+                    jsonObj5[ deviceTimestamp ][ 'value' ]
+                deltaDevice4 = int( deviceTimestamp4 ) - int( t0Tcp )
+                deltaDevice5 = int( deviceTimestamp5 ) - int( t0Tcp )
+                deltaGraph4 = int( graphTimestamp4 ) - int( t0Tcp )
+                deltaGraph5 = int( graphTimestamp5 ) - int( t0Tcp )
+                deltaOfpGraph4 = int( graphTimestamp4 ) - int( t0Ofp )
+                deltaOfpGraph5 = int( graphTimestamp5 ) - int( t0Ofp )
+                deltaOfpDevice4 = float( deviceTimestamp4 ) -\
+                    float( t0Ofp )
+                deltaOfpDevice5 = float( deviceTimestamp5 ) -\
+                    float( t0Ofp )
             else:
-                delta_device_4 = 0
-                delta_device_5 = 0
-                delta_graph_4 = 0
-                delta_graph_5 = 0
-                delta_ofp_graph_4 = 0
-                delta_ofp_graph_5 = 0
-                delta_ofp_device_4 = 0
-                delta_ofp_device_5 = 0
+                deltaDevice4 = 0
+                deltaDevice5 = 0
+                deltaGraph4 = 0
+                deltaGraph5 = 0
+                deltaOfpGraph4 = 0
+                deltaOfpGraph5 = 0
+                deltaOfpDevice4 = 0
+                deltaOfpDevice5 = 0
 
-            if cluster_count >= 7:
-                json_str_6 = main.ONOS6cli.topology_events_metrics()
-                json_str_7 = main.ONOS7cli.topology_events_metrics()
-                json_obj_6 = json.loads(json_str_6)
-                json_obj_7 = json.loads(json_str_7)
-                graph_timestamp_6 = \
-                    json_obj_6[graphTimestamp]['value']
-                graph_timestamp_7 = \
-                    json_obj_7[graphTimestamp]['value']
-                device_timestamp_6 = \
-                    json_obj_6[deviceTimestamp]['value'] 
-                device_timestamp_7 = \
-                    json_obj_7[deviceTimestamp]['value'] 
-                delta_device_6 = int(device_timestamp_6) - int(t0_tcp)
-                delta_device_7 = int(device_timestamp_7) - int(t0_tcp)
-                delta_graph_6 = int(graph_timestamp_6) - int(t0_tcp)
-                delta_graph_7 = int(graph_timestamp_7) - int(t0_tcp)
-                delta_ofp_graph_6 = int(graph_timestamp_6) - int(t0_ofp)
-                delta_ofp_graph_7 = int(graph_timestamp_7) - int(t0_ofp)
-                delta_ofp_device_6 = float(device_timestamp_6) -\
-                        float(t0_ofp)
-                delta_ofp_device_7 = float(device_timestamp_7) -\
-                        float(t0_ofp)
+            if clusterCount >= 7:
+                jsonStr6 = main.ONOS6cli.topologyEventsMetrics()
+                jsonStr7 = main.ONOS7cli.topologyEventsMetrics()
+                jsonObj6 = json.loads( jsonStr6 )
+                jsonObj7 = json.loads( jsonStr7 )
+                graphTimestamp6 = \
+                    jsonObj6[ graphTimestamp ][ 'value' ]
+                graphTimestamp7 = \
+                    jsonObj7[ graphTimestamp ][ 'value' ]
+                deviceTimestamp6 = \
+                    jsonObj6[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp7 = \
+                    jsonObj7[ deviceTimestamp ][ 'value' ]
+                deltaDevice6 = int( deviceTimestamp6 ) - int( t0Tcp )
+                deltaDevice7 = int( deviceTimestamp7 ) - int( t0Tcp )
+                deltaGraph6 = int( graphTimestamp6 ) - int( t0Tcp )
+                deltaGraph7 = int( graphTimestamp7 ) - int( t0Tcp )
+                deltaOfpGraph6 = int( graphTimestamp6 ) - int( t0Ofp )
+                deltaOfpGraph7 = int( graphTimestamp7 ) - int( t0Ofp )
+                deltaOfpDevice6 = float( deviceTimestamp6 ) -\
+                    float( t0Ofp )
+                deltaOfpDevice7 = float( deviceTimestamp7 ) -\
+                    float( t0Ofp )
             else:
-                delta_device_6 = 0
-                delta_device_7 = 0
-                delta_graph_6 = 0
-                delta_graph_7 = 0
-                delta_ofp_graph_6 = 0 
-                delta_ofp_graph_7 = 0
-                delta_ofp_device_6 = 0
-                delta_ofp_device_7 = 0
+                deltaDevice6 = 0
+                deltaDevice7 = 0
+                deltaGraph6 = 0
+                deltaGraph7 = 0
+                deltaOfpGraph6 = 0
+                deltaOfpGraph7 = 0
+                deltaOfpDevice6 = 0
+                deltaOfpDevice7 = 0
 
-            #Get average of delta from all instances
-            avg_delta_device = \
-                    (int(delta_device_1)+\
-                     int(delta_device_2)+\
-                     int(delta_device_3)+\
-                     int(delta_device_4)+\
-                     int(delta_device_5)+\
-                     int(delta_device_6)+\
-                     int(delta_device_7)) / cluster_count 
+            # Get average of delta from all instances
+            avgDeltaDevice = \
+                ( int( deltaDevice1 ) +
+                  int( deltaDevice2 ) +
+                  int( deltaDevice3 ) +
+                  int( deltaDevice4 ) +
+                  int( deltaDevice5 ) +
+                  int( deltaDevice6 ) +
+                  int( deltaDevice7 ) ) / clusterCount
 
-            #Ensure avg delta meets the threshold before appending
-            if avg_delta_device > 0.0 and avg_delta_device < 10000\
-                    and int(i) > iter_ignore:
-                latency_t0_to_device_list.append(avg_delta_device)
+            # Ensure avg delta meets the threshold before appending
+            if avgDeltaDevice > 0.0 and avgDeltaDevice < 10000\
+                    and int( i ) > iterIgnore:
+                latencyT0ToDeviceList.append( avgDeltaDevice )
             else:
-                main.log.info("Results for t0-to-device ignored"+\
-                        "due to excess in threshold / warmup iteration.")
+                main.log.info(
+                    "Results for t0-to-device ignored" +
+                    "due to excess in threshold / warmup iteration." )
 
-            #Get average of delta from all instances
-            #TODO: use max delta graph
-            #max_delta_graph = max(three)
-            avg_delta_graph = \
-                    (int(delta_graph_1)+\
-                     int(delta_graph_2)+\
-                     int(delta_graph_3)+\
-                     int(delta_graph_4)+\
-                     int(delta_graph_5)+\
-                     int(delta_graph_6)+\
-                     int(delta_graph_7)) / cluster_count
+            # Get average of delta from all instances
+            # TODO: use max delta graph
+            #maxDeltaGraph = max( three )
+            avgDeltaGraph = \
+                ( int( deltaGraph1 ) +
+                  int( deltaGraph2 ) +
+                  int( deltaGraph3 ) +
+                  int( deltaGraph4 ) +
+                  int( deltaGraph5 ) +
+                  int( deltaGraph6 ) +
+                  int( deltaGraph7 ) ) / clusterCount
 
-            #Ensure avg delta meets the threshold before appending
-            if avg_delta_graph > 0.0 and avg_delta_graph < 10000\
-                    and int(i) > iter_ignore:
-                latency_end_to_end_list.append(avg_delta_graph)
+            # Ensure avg delta meets the threshold before appending
+            if avgDeltaGraph > 0.0 and avgDeltaGraph < 10000\
+                    and int( i ) > iterIgnore:
+                latencyEndToEndList.append( avgDeltaGraph )
             else:
-                main.log.info("Results for end-to-end ignored"+\
-                        "due to excess in threshold")
+                main.log.info( "Results for end-to-end ignored" +
+                               "due to excess in threshold" )
 
-            
-            avg_delta_ofp_graph = \
-                    (int(delta_ofp_graph_1)+\
-                     int(delta_ofp_graph_2)+\
-                     int(delta_ofp_graph_3)+\
-                     int(delta_ofp_graph_4)+\
-                     int(delta_ofp_graph_5)+\
-                     int(delta_ofp_graph_6)+\
-                     int(delta_ofp_graph_7)) / cluster_count 
-            
-            if avg_delta_ofp_graph > threshold_min \
-                    and avg_delta_ofp_graph < threshold_max\
-                    and int(i) > iter_ignore:
-                latency_ofp_to_graph_list.append(avg_delta_ofp_graph)
-            elif avg_delta_ofp_graph > (-10) and \
-                    avg_delta_ofp_graph < 0.0 and\
-                    int(i) > iter_ignore:
-                main.log.info("Sub-millisecond result likely; "+
-                    "negative result was rounded to 0")
-                #NOTE: Current metrics framework does not 
-                #support sub-millisecond accuracy. Therefore,
-                #if the result is negative, we can reasonably
-                #conclude sub-millisecond results and just 
-                #append the best rounded effort - 0 ms. 
-                latency_ofp_to_graph_list.append(0)
+            avgDeltaOfpGraph = \
+                ( int( deltaOfpGraph1 ) +
+                  int( deltaOfpGraph2 ) +
+                  int( deltaOfpGraph3 ) +
+                  int( deltaOfpGraph4 ) +
+                  int( deltaOfpGraph5 ) +
+                  int( deltaOfpGraph6 ) +
+                  int( deltaOfpGraph7 ) ) / clusterCount
+
+            if avgDeltaOfpGraph > thresholdMin \
+                    and avgDeltaOfpGraph < thresholdMax\
+                    and int( i ) > iterIgnore:
+                latencyOfpToGraphList.append( avgDeltaOfpGraph )
+            elif avgDeltaOfpGraph > ( -10 ) and \
+                    avgDeltaOfpGraph < 0.0 and\
+                    int( i ) > iterIgnore:
+                main.log.info( "Sub-millisecond result likely; " +
+                               "negative result was rounded to 0" )
+                # NOTE: Current metrics framework does not
+                # support sub-millisecond accuracy. Therefore,
+                # if the result is negative, we can reasonably
+                # conclude sub-millisecond results and just
+                # append the best rounded effort - 0 ms.
+                latencyOfpToGraphList.append( 0 )
             else:
-                main.log.info("Results for ofp-to-graph "+\
-                        "ignored due to excess in threshold")
+                main.log.info( "Results for ofp-to-graph " +
+                               "ignored due to excess in threshold" )
 
-            
-            avg_delta_ofp_device = \
-                    (float(delta_ofp_device_1)+\
-                     float(delta_ofp_device_2)+\
-                     float(delta_ofp_device_3)+\
-                     float(delta_ofp_device_4)+\
-                     float(delta_ofp_device_5)+\
-                     float(delta_ofp_device_6)+\
-                     float(delta_ofp_device_7)) / cluster_count 
-            
-            #NOTE: ofp - delta measurements are occasionally negative
+            avgDeltaOfpDevice = \
+                ( float( deltaOfpDevice1 ) +
+                  float( deltaOfpDevice2 ) +
+                  float( deltaOfpDevice3 ) +
+                  float( deltaOfpDevice4 ) +
+                  float( deltaOfpDevice5 ) +
+                  float( deltaOfpDevice6 ) +
+                  float( deltaOfpDevice7 ) ) / clusterCount
+
+            # NOTE: ofp - delta measurements are occasionally negative
             #      due to system time misalignment.
-            latency_ofp_to_device_list.append(avg_delta_ofp_device)
+            latencyOfpToDeviceList.append( avgDeltaOfpDevice )
 
-            delta_ofp_tcp = int(t0_ofp) - int(t0_tcp)
-            if delta_ofp_tcp > threshold_min \
-                    and delta_ofp_tcp < threshold_max and\
-                    int(i) > iter_ignore:
-                latency_tcp_to_ofp_list.append(delta_ofp_tcp)
+            deltaOfpTcp = int( t0Ofp ) - int( t0Tcp )
+            if deltaOfpTcp > thresholdMin \
+                    and deltaOfpTcp < thresholdMax and\
+                    int( i ) > iterIgnore:
+                latencyTcpToOfpList.append( deltaOfpTcp )
             else:
-                main.log.info("Results fo tcp-to-ofp "+\
-                        "ignored due to excess in threshold")
+                main.log.info( "Results fo tcp-to-ofp " +
+                               "ignored due to excess in threshold" )
 
-            #TODO:
-            #Fetch logs upon threshold excess
+            # TODO:
+            # Fetch logs upon threshold excess
 
-            main.log.info("ONOS1 delta end-to-end: "+
-                    str(delta_graph_1) + " ms")
+            main.log.info( "ONOS1 delta end-to-end: " +
+                           str( deltaGraph1 ) + " ms" )
 
-            main.log.info("ONOS1 delta OFP - graph: "+
-                    str(delta_ofp_graph_1) + " ms")
-            
-            main.log.info("ONOS1 delta device - t0: "+
-                    str(delta_device_1) + " ms")
-         
-            main.log.info("TCP to OFP delta: "+
-                    str(delta_ofp_tcp) + " ms")
+            main.log.info( "ONOS1 delta OFP - graph: " +
+                           str( deltaOfpGraph1 ) + " ms" )
 
-            main.step("Remove switch from controller")
-            main.Mininet1.delete_sw_controller("s1")
+            main.log.info( "ONOS1 delta device - t0: " +
+                           str( deltaDevice1 ) + " ms" )
 
-            time.sleep(5)
+            main.log.info( "TCP to OFP delta: " +
+                           str( deltaOfpTcp ) + " ms" )
 
-        #END of for loop iteration
+            main.step( "Remove switch from controller" )
+            main.Mininet1.deleteSwController( "s1" )
 
-        #If there is at least 1 element in each list,
-        #pass the test case
-        if len(latency_end_to_end_list) > 0 and\
-           len(latency_ofp_to_graph_list) > 0 and\
-           len(latency_ofp_to_device_list) > 0 and\
-           len(latency_t0_to_device_list) > 0 and\
-           len(latency_tcp_to_ofp_list) > 0:
+            time.sleep( 5 )
+
+        # END of for loop iteration
+
+        # If there is at least 1 element in each list,
+        # pass the test case
+        if len( latencyEndToEndList ) > 0 and\
+           len( latencyOfpToGraphList ) > 0 and\
+           len( latencyOfpToDeviceList ) > 0 and\
+           len( latencyT0ToDeviceList ) > 0 and\
+           len( latencyTcpToOfpList ) > 0:
             assertion = main.TRUE
-        elif len(latency_end_to_end_list) == 0:
-            #The appending of 0 here is to prevent 
-            #the min,max,sum functions from failing 
-            #below
-            latency_end_to_end_list.append(0)
+        elif len( latencyEndToEndList ) == 0:
+            # The appending of 0 here is to prevent
+            # the min,max,sum functions from failing
+            # below
+            latencyEndToEndList.append( 0 )
             assertion = main.FALSE
-        elif len(latency_ofp_to_graph_list) == 0:
-            latency_ofp_to_graph_list.append(0)
+        elif len( latencyOfpToGraphList ) == 0:
+            latencyOfpToGraphList.append( 0 )
             assertion = main.FALSE
-        elif len(latency_ofp_to_device_list) == 0:
-            latency_ofp_to_device_list.append(0)
+        elif len( latencyOfpToDeviceList ) == 0:
+            latencyOfpToDeviceList.append( 0 )
             assertion = main.FALSE
-        elif len(latency_t0_to_device_list) == 0:
-            latency_t0_to_device_list.append(0)
+        elif len( latencyT0ToDeviceList ) == 0:
+            latencyT0ToDeviceList.append( 0 )
             assertion = main.FALSE
-        elif len(latency_tcp_to_ofp_list) == 0:
-            latency_tcp_to_ofp_list.append(0)
+        elif len( latencyTcpToOfpList ) == 0:
+            latencyTcpToOfpList.append( 0 )
             assertion = main.FALSE
 
-        #Calculate min, max, avg of latency lists
-        latency_end_to_end_max = \
-                int(max(latency_end_to_end_list))
-        latency_end_to_end_min = \
-                int(min(latency_end_to_end_list))
-        latency_end_to_end_avg = \
-                (int(sum(latency_end_to_end_list)) / \
-                 len(latency_end_to_end_list))
-        latency_end_to_end_std_dev = \
-                str(round(numpy.std(latency_end_to_end_list),1))
+        # Calculate min, max, avg of latency lists
+        latencyEndToEndMax = \
+            int( max( latencyEndToEndList ) )
+        latencyEndToEndMin = \
+            int( min( latencyEndToEndList ) )
+        latencyEndToEndAvg = \
+            ( int( sum( latencyEndToEndList ) ) /
+              len( latencyEndToEndList ) )
+        latencyEndToEndStdDev = \
+            str( round( numpy.std( latencyEndToEndList ), 1 ) )
 
-        latency_ofp_to_graph_max = \
-                int(max(latency_ofp_to_graph_list))
-        latency_ofp_to_graph_min = \
-                int(min(latency_ofp_to_graph_list))
-        latency_ofp_to_graph_avg = \
-                (int(sum(latency_ofp_to_graph_list)) / \
-                 len(latency_ofp_to_graph_list))
-        latency_ofp_to_graph_std_dev = \
-                str(round(numpy.std(latency_ofp_to_graph_list),1))
+        latencyOfpToGraphMax = \
+            int( max( latencyOfpToGraphList ) )
+        latencyOfpToGraphMin = \
+            int( min( latencyOfpToGraphList ) )
+        latencyOfpToGraphAvg = \
+            ( int( sum( latencyOfpToGraphList ) ) /
+              len( latencyOfpToGraphList ) )
+        latencyOfpToGraphStdDev = \
+            str( round( numpy.std( latencyOfpToGraphList ), 1 ) )
 
-        latency_ofp_to_device_max = \
-                int(max(latency_ofp_to_device_list))
-        latency_ofp_to_device_min = \
-                int(min(latency_ofp_to_device_list))
-        latency_ofp_to_device_avg = \
-                (int(sum(latency_ofp_to_device_list)) / \
-                 len(latency_ofp_to_device_list))
-        latency_ofp_to_device_std_dev = \
-                str(round(numpy.std(latency_ofp_to_device_list),1))
+        latencyOfpToDeviceMax = \
+            int( max( latencyOfpToDeviceList ) )
+        latencyOfpToDeviceMin = \
+            int( min( latencyOfpToDeviceList ) )
+        latencyOfpToDeviceAvg = \
+            ( int( sum( latencyOfpToDeviceList ) ) /
+              len( latencyOfpToDeviceList ) )
+        latencyOfpToDeviceStdDev = \
+            str( round( numpy.std( latencyOfpToDeviceList ), 1 ) )
 
-        latency_t0_to_device_max = \
-                int(max(latency_t0_to_device_list))
-        latency_t0_to_device_min = \
-                int(min(latency_t0_to_device_list))
-        latency_t0_to_device_avg = \
-                (int(sum(latency_t0_to_device_list)) / \
-                 len(latency_t0_to_device_list))
-        latency_ofp_to_device_std_dev = \
-                str(round(numpy.std(latency_t0_to_device_list),1))
+        latencyT0ToDeviceMax = \
+            int( max( latencyT0ToDeviceList ) )
+        latencyT0ToDeviceMin = \
+            int( min( latencyT0ToDeviceList ) )
+        latencyT0ToDeviceAvg = \
+            ( int( sum( latencyT0ToDeviceList ) ) /
+              len( latencyT0ToDeviceList ) )
+        latencyOfpToDeviceStdDev = \
+            str( round( numpy.std( latencyT0ToDeviceList ), 1 ) )
 
-        latency_tcp_to_ofp_max = \
-                int(max(latency_tcp_to_ofp_list))
-        latency_tcp_to_ofp_min = \
-                int(min(latency_tcp_to_ofp_list))
-        latency_tcp_to_ofp_avg = \
-                (int(sum(latency_tcp_to_ofp_list)) / \
-                 len(latency_tcp_to_ofp_list))
-        latency_tcp_to_ofp_std_dev = \
-                str(round(numpy.std(latency_tcp_to_ofp_list),1))
+        latencyTcpToOfpMax = \
+            int( max( latencyTcpToOfpList ) )
+        latencyTcpToOfpMin = \
+            int( min( latencyTcpToOfpList ) )
+        latencyTcpToOfpAvg = \
+            ( int( sum( latencyTcpToOfpList ) ) /
+              len( latencyTcpToOfpList ) )
+        latencyTcpToOfpStdDev = \
+            str( round( numpy.std( latencyTcpToOfpList ), 1 ) )
 
-        main.log.report("Cluster size: "+str(cluster_count)+\
-                " node(s)")
-        main.log.report("Switch add - End-to-end latency: "+\
-                "Avg: "+str(latency_end_to_end_avg)+" ms "+
-                "Std Deviation: "+latency_end_to_end_std_dev+" ms")
-        main.log.report("Switch add - OFP-to-Graph latency: "+\
-                "Note: results are not accurate to sub-millisecond. "+
-                "Any sub-millisecond results are rounded to 0 ms. ")
-        main.log.report("Avg: "+str(latency_ofp_to_graph_avg)+" ms "+
-                "Std Deviation: "+latency_ofp_to_graph_std_dev+" ms")
-        main.log.report("Switch add - TCP-to-OFP latency: "+\
-                "Avg: "+str(latency_tcp_to_ofp_avg)+" ms "+
-                "Std Deviation: "+latency_tcp_to_ofp_std_dev+" ms")
+        main.log.report( "Cluster size: " + str( clusterCount ) +
+                         " node(s)" )
+        main.log.report( "Switch add - End-to-end latency: " +
+                         "Avg: " + str( latencyEndToEndAvg ) + " ms " +
+                         "Std Deviation: " + latencyEndToEndStdDev + " ms" )
+        main.log.report(
+            "Switch add - OFP-to-Graph latency: " +
+            "Note: results are not accurate to sub-millisecond. " +
+            "Any sub-millisecond results are rounded to 0 ms. " )
+        main.log.report( "Avg: " + str( latencyOfpToGraphAvg ) + " ms " +
+                         "Std Deviation: " + latencyOfpToGraphStdDev + " ms" )
+        main.log.report( "Switch add - TCP-to-OFP latency: " +
+                         "Avg: " + str( latencyTcpToOfpAvg ) + " ms " +
+                         "Std Deviation: " + latencyTcpToOfpStdDev + " ms" )
 
-        if debug_mode == 'on':
-            main.ONOS1.cp_logs_to_dir("/opt/onos/log/karaf.log",
-                    "/tmp/", copy_file_name="sw_lat_karaf")
+        if debugMode == 'on':
+            main.ONOS1.cpLogsToDir( "/opt/onos/log/karaf.log",
+                                      "/tmp/", copyFileName="sw_lat_karaf" )
 
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
-                onpass="Switch latency test successful",
-                onfail="Switch latency test failed")
+        utilities.assert_equals( expect=main.TRUE, actual=assertion,
+                                onpass="Switch latency test successful",
+                                onfail="Switch latency test failed" )
 
-    def CASE3(self, main):
-        '''
+    def CASE3( self, main ):
+        """
         Bring port up / down and measure latency.
         Port enable / disable is simulated by ifconfig up / down
-        
-        In ONOS-next, we must ensure that the port we are 
+
+        In ONOS-next, we must ensure that the port we are
         manipulating is connected to another switch with a valid
         connection. Otherwise, graph view will not be updated.
-        '''
+        """
         import time
         import subprocess
         import os
         import requests
         import json
         import numpy
-        global cluster_count
+        global clusterCount
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS_user = main.params['CTRL']['user']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        default_sw_port = main.params['CTRL']['port1']
-      
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
+
         assertion = main.TRUE
-        #Number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-       
-        #Timestamp 'keys' for json metrics output.
-        #These are subject to change, hence moved into params
-        deviceTimestamp = main.params['JSON']['deviceTimestamp']
-        graphTimestamp = main.params['JSON']['graphTimestamp']
-        
-        debug_mode = main.params['TEST']['debugMode']
+        # Number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
 
-        local_time = time.strftime('%x %X')
-        local_time = local_time.replace("/","")
-        local_time = local_time.replace(" ","_")
-        local_time = local_time.replace(":","")
-        if debug_mode == 'on':
-            main.ONOS1.tshark_pcap("eth0",
-                    "/tmp/port_lat_pcap_"+local_time) 
+        # Timestamp 'keys' for json metrics output.
+        # These are subject to change, hence moved into params
+        deviceTimestamp = main.params[ 'JSON' ][ 'deviceTimestamp' ]
+        graphTimestamp = main.params[ 'JSON' ][ 'graphTimestamp' ]
 
-        #Threshold for this test case
-        up_threshold_str = main.params['TEST']['portUpThreshold']
-        down_threshold_str = main.params['TEST']['portDownThreshold']
-        
-        up_threshold_obj = up_threshold_str.split(",")
-        down_threshold_obj = down_threshold_str.split(",")
+        debugMode = main.params[ 'TEST' ][ 'debugMode' ]
 
-        up_threshold_min = int(up_threshold_obj[0])
-        up_threshold_max = int(up_threshold_obj[1])
+        localTime = time.strftime( '%x %X' )
+        localTime = localTime.replace( "/", "" )
+        localTime = localTime.replace( " ", "_" )
+        localTime = localTime.replace( ":", "" )
+        if debugMode == 'on':
+            main.ONOS1.tsharkPcap( "eth0",
+                                   "/tmp/port_lat_pcap_" + localTime )
 
-        down_threshold_min = int(down_threshold_obj[0])
-        down_threshold_max = int(down_threshold_obj[1])
+        # Threshold for this test case
+        upThresholdStr = main.params[ 'TEST' ][ 'portUpThreshold' ]
+        downThresholdStr = main.params[ 'TEST' ][ 'portDownThreshold' ]
 
-        #NOTE: Some hardcoded variables you may need to configure
+        upThresholdObj = upThresholdStr.split( "," )
+        downThresholdObj = downThresholdStr.split( "," )
+
+        upThresholdMin = int( upThresholdObj[ 0 ] )
+        upThresholdMax = int( upThresholdObj[ 1 ] )
+
+        downThresholdMin = int( downThresholdObj[ 0 ] )
+        downThresholdMax = int( downThresholdObj[ 1 ] )
+
+        # NOTE: Some hardcoded variables you may need to configure
         #      besides the params
-            
-        tshark_port_status = "OFP 130 Port Status"
 
-        tshark_port_up = "/tmp/tshark_port_up.txt"
-        tshark_port_down = "/tmp/tshark_port_down.txt"
-        interface_config = "s1-eth1"
+        tsharkPortStatus = "OFP 130 Port Status"
 
-        main.log.report("Port enable / disable latency")
-        main.log.report("Simulated by ifconfig up / down")
-        main.log.report("Total iterations of test: "+str(num_iter))
+        tsharkPortUp = "/tmp/tshark_port_up.txt"
+        tsharkPortDown = "/tmp/tshark_port_down.txt"
+        interfaceConfig = "s1-eth1"
 
-        main.step("Assign switches s1 and s2 to controller 1")
-        main.Mininet1.assign_sw_controller(sw="1",ip1=ONOS1_ip,
-                port1=default_sw_port)
-        main.Mininet1.assign_sw_controller(sw="2",ip1=ONOS1_ip,
-                port1=default_sw_port)
+        main.log.report( "Port enable / disable latency" )
+        main.log.report( "Simulated by ifconfig up / down" )
+        main.log.report( "Total iterations of test: " + str( numIter ) )
 
-        #Give enough time for metrics to propagate the 
-        #assign controller event. Otherwise, these events may
-        #carry over to our measurements
-        time.sleep(15)
+        main.step( "Assign switches s1 and s2 to controller 1" )
+        main.Mininet1.assignSwController( sw="1", ip1=ONOS1Ip,
+                                           port1=defaultSwPort )
+        main.Mininet1.assignSwController( sw="2", ip1=ONOS1Ip,
+                                           port1=defaultSwPort )
 
-        port_up_device_to_ofp_list = []
-        port_up_graph_to_ofp_list = []
-        port_down_device_to_ofp_list = []
-        port_down_graph_to_ofp_list = []
+        # Give enough time for metrics to propagate the
+        # assign controller event. Otherwise, these events may
+        # carry over to our measurements
+        time.sleep( 15 )
 
-        for i in range(0, int(num_iter)):
-            main.step("Starting wireshark capture for port status down")
-            main.ONOS1.tshark_grep(tshark_port_status,
-                    tshark_port_down)
-            
-            time.sleep(5)
+        portUpDeviceToOfpList = []
+        portUpGraphToOfpList = []
+        portDownDeviceToOfpList = []
+        portDownGraphToOfpList = []
 
-            #Disable interface that is connected to switch 2
-            main.step("Disable port: "+interface_config)
-            main.Mininet1.handle.sendline("sh ifconfig "+
-                    interface_config+" down")
-            main.Mininet1.handle.expect("mininet>")
+        for i in range( 0, int( numIter ) ):
+            main.step( "Starting wireshark capture for port status down" )
+            main.ONOS1.tsharkGrep( tsharkPortStatus,
+                                   tsharkPortDown )
 
-            time.sleep(3)
-            main.ONOS1.tshark_stop()
-            
-            #Copy tshark output file from ONOS to TestON instance
+            time.sleep( 5 )
+
+            # Disable interface that is connected to switch 2
+            main.step( "Disable port: " + interfaceConfig )
+            main.Mininet1.handle.sendline( "sh ifconfig " +
+                                           interfaceConfig + " down" )
+            main.Mininet1.handle.expect( "mininet>" )
+
+            time.sleep( 3 )
+            main.ONOS1.tsharkStop()
+
+            # Copy tshark output file from ONOS to TestON instance
             #/tmp directory
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_port_down+" /tmp/")
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkPortDown + " /tmp/" )
 
-            f_port_down = open(tshark_port_down, 'r')
-            #Get first line of port down event from tshark
-            f_line = f_port_down.readline()
-            obj_down = f_line.split(" ")
-            if len(f_line) > 0:
-                #NOTE: obj_down[1] is a very unreliable
-                #      way to determine the timestamp. If 
-                #      results seem way off, check the object 
+            fPortDown = open( tsharkPortDown, 'r' )
+            # Get first line of port down event from tshark
+            fLine = fPortDown.readline()
+            objDown = fLine.split( " " )
+            if len( fLine ) > 0:
+                # NOTE: objDown[ 1 ] is a very unreliable
+                #      way to determine the timestamp. If
+                #      results seem way off, check the object
                 #      itself by printing it out
-                timestamp_begin_pt_down = int(float(obj_down[1])*1000)
-                # For some reason, wireshark decides to record the 
+                timestampBeginPtDown = int( float( objDown[ 1 ] ) * 1000 )
+                # For some reason, wireshark decides to record the
                 # timestamp at the 3rd object position instead of
-                # 2nd at unpredictable times. This statement is 
+                # 2nd at unpredictable times. This statement is
                 # used to capture that odd behavior and use the
                 # correct epoch time
-                if timestamp_begin_pt_down < 1400000000000:
-                    timestamp_begin_pt_down = \
-                        int(float(obj_down[2])*1000)
+                if timestampBeginPtDown < 1400000000000:
+                    timestampBeginPtDown = \
+                        int( float( objDown[ 2 ] ) * 1000 )
 
-                main.log.info("Port down begin timestamp: "+
-                        str(timestamp_begin_pt_down))
+                main.log.info( "Port down begin timestamp: " +
+                               str( timestampBeginPtDown ) )
             else:
-                main.log.info("Tshark output file returned unexpected"+
-                        " results: "+str(obj_down))
-                timestamp_begin_pt_down = 0
-            f_port_down.close()
-            
-            main.step("Obtain t1 by metrics call")
-            json_str_up_1 = main.ONOS1cli.topology_events_metrics()
-            json_obj_1 = json.loads(json_str_up_1)
-            #Obtain graph timestamp. This timestsamp captures
-            #the epoch time at which the topology graph was updated.
-            graph_timestamp_1 = \
-                    json_obj_1[graphTimestamp]['value']
-            #Obtain device timestamp. This timestamp captures
-            #the epoch time at which the device event happened
-            device_timestamp_1 = \
-                    json_obj_1[deviceTimestamp]['value'] 
-            #Get delta between graph event and OFP 
-            pt_down_graph_to_ofp_1 = int(graph_timestamp_1) -\
-                    int(timestamp_begin_pt_down)
-            #Get delta between device event and OFP
-            pt_down_device_to_ofp_1 = int(device_timestamp_1) -\
-                    int(timestamp_begin_pt_down)
-            
-            if cluster_count >= 3:
-                json_str_up_2 = main.ONOS2cli.topology_events_metrics()
-                json_str_up_3 = main.ONOS3cli.topology_events_metrics()
-                json_obj_2 = json.loads(json_str_up_2)
-                json_obj_3 = json.loads(json_str_up_3)
-                graph_timestamp_2 = \
-                    json_obj_2[graphTimestamp]['value']
-                graph_timestamp_3 = \
-                    json_obj_3[graphTimestamp]['value']
-                device_timestamp_2 = \
-                    json_obj_2[deviceTimestamp]['value'] 
-                device_timestamp_3 = \
-                    json_obj_3[deviceTimestamp]['value'] 
-                pt_down_graph_to_ofp_2 = int(graph_timestamp_2) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_graph_to_ofp_3 = int(graph_timestamp_3) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_2 = int(device_timestamp_2) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_3 = int(device_timestamp_3) -\
-                    int(timestamp_begin_pt_down)
+                main.log.info( "Tshark output file returned unexpected" +
+                               " results: " + str( objDown ) )
+                timestampBeginPtDown = 0
+            fPortDown.close()
+
+            main.step( "Obtain t1 by metrics call" )
+            jsonStrUp1 = main.ONOS1cli.topologyEventsMetrics()
+            jsonObj1 = json.loads( jsonStrUp1 )
+            # Obtain graph timestamp. This timestsamp captures
+            # the epoch time at which the topology graph was updated.
+            graphTimestamp1 = \
+                jsonObj1[ graphTimestamp ][ 'value' ]
+            # Obtain device timestamp. This timestamp captures
+            # the epoch time at which the device event happened
+            deviceTimestamp1 = \
+                jsonObj1[ deviceTimestamp ][ 'value' ]
+            # Get delta between graph event and OFP
+            ptDownGraphToOfp1 = int( graphTimestamp1 ) -\
+                int( timestampBeginPtDown )
+            # Get delta between device event and OFP
+            ptDownDeviceToOfp1 = int( deviceTimestamp1 ) -\
+                int( timestampBeginPtDown )
+
+            if clusterCount >= 3:
+                jsonStrUp2 = main.ONOS2cli.topologyEventsMetrics()
+                jsonStrUp3 = main.ONOS3cli.topologyEventsMetrics()
+                jsonObj2 = json.loads( jsonStrUp2 )
+                jsonObj3 = json.loads( jsonStrUp3 )
+                graphTimestamp2 = \
+                    jsonObj2[ graphTimestamp ][ 'value' ]
+                graphTimestamp3 = \
+                    jsonObj3[ graphTimestamp ][ 'value' ]
+                deviceTimestamp2 = \
+                    jsonObj2[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp3 = \
+                    jsonObj3[ deviceTimestamp ][ 'value' ]
+                ptDownGraphToOfp2 = int( graphTimestamp2 ) -\
+                    int( timestampBeginPtDown )
+                ptDownGraphToOfp3 = int( graphTimestamp3 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp2 = int( deviceTimestamp2 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp3 = int( deviceTimestamp3 ) -\
+                    int( timestampBeginPtDown )
             else:
-                pt_down_graph_to_ofp_2 = 0
-                pt_down_graph_to_ofp_3 = 0
-                pt_down_device_to_ofp_2 = 0
-                pt_down_device_to_ofp_3 = 0
+                ptDownGraphToOfp2 = 0
+                ptDownGraphToOfp3 = 0
+                ptDownDeviceToOfp2 = 0
+                ptDownDeviceToOfp3 = 0
 
-            if cluster_count >= 5:
-                json_str_up_4 = main.ONOS4cli.topology_events_metrics()
-                json_str_up_5 = main.ONOS5cli.topology_events_metrics()
-                json_obj_4 = json.loads(json_str_up_4)
-                json_obj_5 = json.loads(json_str_up_5)
-                graph_timestamp_4 = \
-                    json_obj_4[graphTimestamp]['value']
-                graph_timestamp_5 = \
-                    json_obj_5[graphTimestamp]['value']
-                device_timestamp_4 = \
-                    json_obj_4[deviceTimestamp]['value'] 
-                device_timestamp_5 = \
-                    json_obj_5[deviceTimestamp]['value'] 
-                pt_down_graph_to_ofp_4 = int(graph_timestamp_4) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_graph_to_ofp_5 = int(graph_timestamp_5) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_4 = int(device_timestamp_4) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_5 = int(device_timestamp_5) -\
-                    int(timestamp_begin_pt_down)
+            if clusterCount >= 5:
+                jsonStrUp4 = main.ONOS4cli.topologyEventsMetrics()
+                jsonStrUp5 = main.ONOS5cli.topologyEventsMetrics()
+                jsonObj4 = json.loads( jsonStrUp4 )
+                jsonObj5 = json.loads( jsonStrUp5 )
+                graphTimestamp4 = \
+                    jsonObj4[ graphTimestamp ][ 'value' ]
+                graphTimestamp5 = \
+                    jsonObj5[ graphTimestamp ][ 'value' ]
+                deviceTimestamp4 = \
+                    jsonObj4[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp5 = \
+                    jsonObj5[ deviceTimestamp ][ 'value' ]
+                ptDownGraphToOfp4 = int( graphTimestamp4 ) -\
+                    int( timestampBeginPtDown )
+                ptDownGraphToOfp5 = int( graphTimestamp5 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp4 = int( deviceTimestamp4 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp5 = int( deviceTimestamp5 ) -\
+                    int( timestampBeginPtDown )
             else:
-                pt_down_graph_to_ofp_4 = 0
-                pt_down_graph_to_ofp_5 = 0
-                pt_down_device_to_ofp_4 = 0
-                pt_down_device_to_ofp_5 = 0
+                ptDownGraphToOfp4 = 0
+                ptDownGraphToOfp5 = 0
+                ptDownDeviceToOfp4 = 0
+                ptDownDeviceToOfp5 = 0
 
-            if cluster_count >= 7:
-                json_str_up_6 = main.ONOS6cli.topology_events_metrics()
-                json_str_up_7 = main.ONOS7cli.topology_events_metrics()
-                json_obj_6 = json.loads(json_str_up_6)
-                json_obj_7 = json.loads(json_str_up_7)
-                graph_timestamp_6 = \
-                    json_obj_6[graphTimestamp]['value']
-                graph_timestamp_7 = \
-                    json_obj_7[graphTimestamp]['value']
-                device_timestamp_6 = \
-                    json_obj_6[deviceTimestamp]['value'] 
-                device_timestamp_7 = \
-                    json_obj_7[deviceTimestamp]['value'] 
-                pt_down_graph_to_ofp_6 = int(graph_timestamp_6) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_graph_to_ofp_7 = int(graph_timestamp_7) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_6 = int(device_timestamp_6) -\
-                    int(timestamp_begin_pt_down)
-                pt_down_device_to_ofp_7 = int(device_timestamp_7) -\
-                    int(timestamp_begin_pt_down)
+            if clusterCount >= 7:
+                jsonStrUp6 = main.ONOS6cli.topologyEventsMetrics()
+                jsonStrUp7 = main.ONOS7cli.topologyEventsMetrics()
+                jsonObj6 = json.loads( jsonStrUp6 )
+                jsonObj7 = json.loads( jsonStrUp7 )
+                graphTimestamp6 = \
+                    jsonObj6[ graphTimestamp ][ 'value' ]
+                graphTimestamp7 = \
+                    jsonObj7[ graphTimestamp ][ 'value' ]
+                deviceTimestamp6 = \
+                    jsonObj6[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp7 = \
+                    jsonObj7[ deviceTimestamp ][ 'value' ]
+                ptDownGraphToOfp6 = int( graphTimestamp6 ) -\
+                    int( timestampBeginPtDown )
+                ptDownGraphToOfp7 = int( graphTimestamp7 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp6 = int( deviceTimestamp6 ) -\
+                    int( timestampBeginPtDown )
+                ptDownDeviceToOfp7 = int( deviceTimestamp7 ) -\
+                    int( timestampBeginPtDown )
             else:
-                pt_down_graph_to_ofp_6 = 0
-                pt_down_graph_to_ofp_7 = 0
-                pt_down_device_to_ofp_6 = 0
-                pt_down_device_to_ofp_7 = 0
+                ptDownGraphToOfp6 = 0
+                ptDownGraphToOfp7 = 0
+                ptDownDeviceToOfp6 = 0
+                ptDownDeviceToOfp7 = 0
 
-            time.sleep(3)
+            time.sleep( 3 )
 
-            #Caluclate average across clusters
-            pt_down_graph_to_ofp_avg =\
-                    (int(pt_down_graph_to_ofp_1) +
-                     int(pt_down_graph_to_ofp_2) + 
-                     int(pt_down_graph_to_ofp_3) +
-                     int(pt_down_graph_to_ofp_4) +
-                     int(pt_down_graph_to_ofp_5) +
-                     int(pt_down_graph_to_ofp_6) +
-                     int(pt_down_graph_to_ofp_7)) / cluster_count 
-            pt_down_device_to_ofp_avg = \
-                    (int(pt_down_device_to_ofp_1) + 
-                     int(pt_down_device_to_ofp_2) +
-                     int(pt_down_device_to_ofp_3) +
-                     int(pt_down_device_to_ofp_4) +
-                     int(pt_down_device_to_ofp_5) +
-                     int(pt_down_device_to_ofp_6) +
-                     int(pt_down_device_to_ofp_7)) / cluster_count 
+            # Caluclate average across clusters
+            ptDownGraphToOfpAvg =\
+                ( int( ptDownGraphToOfp1 ) +
+                  int( ptDownGraphToOfp2 ) +
+                  int( ptDownGraphToOfp3 ) +
+                  int( ptDownGraphToOfp4 ) +
+                  int( ptDownGraphToOfp5 ) +
+                  int( ptDownGraphToOfp6 ) +
+                  int( ptDownGraphToOfp7 ) ) / clusterCount
+            ptDownDeviceToOfpAvg = \
+                ( int( ptDownDeviceToOfp1 ) +
+                  int( ptDownDeviceToOfp2 ) +
+                  int( ptDownDeviceToOfp3 ) +
+                  int( ptDownDeviceToOfp4 ) +
+                  int( ptDownDeviceToOfp5 ) +
+                  int( ptDownDeviceToOfp6 ) +
+                  int( ptDownDeviceToOfp7 ) ) / clusterCount
 
-            if pt_down_graph_to_ofp_avg > down_threshold_min and \
-                    pt_down_graph_to_ofp_avg < down_threshold_max:
-                port_down_graph_to_ofp_list.append(
-                    pt_down_graph_to_ofp_avg)
-                main.log.info("Port down: graph to ofp avg: "+
-                    str(pt_down_graph_to_ofp_avg) + " ms")
+            if ptDownGraphToOfpAvg > downThresholdMin and \
+                    ptDownGraphToOfpAvg < downThresholdMax:
+                portDownGraphToOfpList.append(
+                    ptDownGraphToOfpAvg )
+                main.log.info( "Port down: graph to ofp avg: " +
+                               str( ptDownGraphToOfpAvg ) + " ms" )
             else:
-                main.log.info("Average port down graph-to-ofp result" +
-                        " exceeded the threshold: "+
-                        str(pt_down_graph_to_ofp_avg))
+                main.log.info( "Average port down graph-to-ofp result" +
+                               " exceeded the threshold: " +
+                               str( ptDownGraphToOfpAvg ) )
 
-            if pt_down_device_to_ofp_avg > 0 and \
-                    pt_down_device_to_ofp_avg < 1000:
-                port_down_device_to_ofp_list.append(
-                    pt_down_device_to_ofp_avg)
-                main.log.info("Port down: device to ofp avg: "+
-                    str(pt_down_device_to_ofp_avg) + " ms")
+            if ptDownDeviceToOfpAvg > 0 and \
+                    ptDownDeviceToOfpAvg < 1000:
+                portDownDeviceToOfpList.append(
+                    ptDownDeviceToOfpAvg )
+                main.log.info( "Port down: device to ofp avg: " +
+                               str( ptDownDeviceToOfpAvg ) + " ms" )
             else:
-                main.log.info("Average port down device-to-ofp result" +
-                        " exceeded the threshold: "+
-                        str(pt_down_device_to_ofp_avg))
+                main.log.info( "Average port down device-to-ofp result" +
+                               " exceeded the threshold: " +
+                               str( ptDownDeviceToOfpAvg ) )
 
-            #Port up events 
-            main.step("Enable port and obtain timestamp")
-            main.step("Starting wireshark capture for port status up")
-            main.ONOS1.tshark_grep(tshark_port_status, tshark_port_up)
-            time.sleep(5)
+            # Port up events
+            main.step( "Enable port and obtain timestamp" )
+            main.step( "Starting wireshark capture for port status up" )
+            main.ONOS1.tsharkGrep( tsharkPortStatus, tsharkPortUp )
+            time.sleep( 5 )
 
-            main.Mininet1.handle.sendline("sh ifconfig "+
-                    interface_config+" up")
-            main.Mininet1.handle.expect("mininet>")
-            
-            #Allow time for tshark to capture event
-            time.sleep(5)
-            main.ONOS1.tshark_stop()
-            
-            time.sleep(3)
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_port_up+" /tmp/")
-            f_port_up = open(tshark_port_up, 'r')
-            f_line = f_port_up.readline()
-            obj_up = f_line.split(" ")
-            if len(f_line) > 0:
-                timestamp_begin_pt_up = int(float(obj_up[1])*1000)
-                if timestamp_begin_pt_up < 1400000000000:
-                    timestamp_begin_pt_up = \
-                        int(float(obj_up[2])*1000)
-                main.log.info("Port up begin timestamp: "+
-                        str(timestamp_begin_pt_up))
+            main.Mininet1.handle.sendline( "sh ifconfig " +
+                                           interfaceConfig + " up" )
+            main.Mininet1.handle.expect( "mininet>" )
+
+            # Allow time for tshark to capture event
+            time.sleep( 5 )
+            main.ONOS1.tsharkStop()
+
+            time.sleep( 3 )
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkPortUp + " /tmp/" )
+            fPortUp = open( tsharkPortUp, 'r' )
+            fLine = fPortUp.readline()
+            objUp = fLine.split( " " )
+            if len( fLine ) > 0:
+                timestampBeginPtUp = int( float( objUp[ 1 ] ) * 1000 )
+                if timestampBeginPtUp < 1400000000000:
+                    timestampBeginPtUp = \
+                        int( float( objUp[ 2 ] ) * 1000 )
+                main.log.info( "Port up begin timestamp: " +
+                               str( timestampBeginPtUp ) )
             else:
-                main.log.info("Tshark output file returned unexpected"+
-                        " results.")
-                timestamp_begin_pt_up = 0
-            f_port_up.close()
+                main.log.info( "Tshark output file returned unexpected" +
+                               " results." )
+                timestampBeginPtUp = 0
+            fPortUp.close()
 
-            #Obtain metrics shortly afterwards
-            #This timestsamp captures
-            #the epoch time at which the topology graph was updated.
-            main.step("Obtain t1 by REST call")
-            json_str_up_1 = main.ONOS1cli.topology_events_metrics()
-            json_obj_1 = json.loads(json_str_up_1)
-            graph_timestamp_1 = \
-                    json_obj_1[graphTimestamp]['value']
-            #Obtain device timestamp. This timestamp captures
-            #the epoch time at which the device event happened
-            device_timestamp_1 = \
-                    json_obj_1[deviceTimestamp]['value'] 
-            #Get delta between graph event and OFP 
-            pt_up_graph_to_ofp_1 = int(graph_timestamp_1) -\
-                    int(timestamp_begin_pt_up)
-            #Get delta between device event and OFP
-            pt_up_device_to_ofp_1 = int(device_timestamp_1) -\
-                    int(timestamp_begin_pt_up)
-            
-            if cluster_count >= 3:
-                json_str_up_2 = main.ONOS2cli.topology_events_metrics()
-                json_str_up_3 = main.ONOS3cli.topology_events_metrics()
-                json_obj_2 = json.loads(json_str_up_2)
-                json_obj_3 = json.loads(json_str_up_3)
-                graph_timestamp_2 = \
-                    json_obj_2[graphTimestamp]['value']
-                graph_timestamp_3 = \
-                    json_obj_3[graphTimestamp]['value']
-                device_timestamp_2 = \
-                    json_obj_2[deviceTimestamp]['value'] 
-                device_timestamp_3 = \
-                    json_obj_3[deviceTimestamp]['value'] 
-                pt_up_graph_to_ofp_2 = int(graph_timestamp_2) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_graph_to_ofp_3 = int(graph_timestamp_3) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_2 = int(device_timestamp_2) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_3 = int(device_timestamp_3) -\
-                    int(timestamp_begin_pt_up)
-            else:
-                pt_up_graph_to_ofp_2 = 0
-                pt_up_graph_to_ofp_3 = 0
-                pt_up_device_to_ofp_2 = 0
-                pt_up_device_to_ofp_3 = 0
-            
-            if cluster_count >= 5:
-                json_str_up_4 = main.ONOS4cli.topology_events_metrics()
-                json_str_up_5 = main.ONOS5cli.topology_events_metrics()
-                json_obj_4 = json.loads(json_str_up_4)
-                json_obj_5 = json.loads(json_str_up_5)
-                graph_timestamp_4 = \
-                    json_obj_4[graphTimestamp]['value']
-                graph_timestamp_5 = \
-                    json_obj_5[graphTimestamp]['value']
-                device_timestamp_4 = \
-                    json_obj_4[deviceTimestamp]['value'] 
-                device_timestamp_5 = \
-                    json_obj_5[deviceTimestamp]['value'] 
-                pt_up_graph_to_ofp_4 = int(graph_timestamp_4) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_graph_to_ofp_5 = int(graph_timestamp_5) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_4 = int(device_timestamp_4) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_5 = int(device_timestamp_5) -\
-                    int(timestamp_begin_pt_up)
-            else:
-                pt_up_graph_to_ofp_4 = 0
-                pt_up_graph_to_ofp_5 = 0
-                pt_up_device_to_ofp_4 = 0
-                pt_up_device_to_ofp_5 = 0
+            # Obtain metrics shortly afterwards
+            # This timestsamp captures
+            # the epoch time at which the topology graph was updated.
+            main.step( "Obtain t1 by REST call" )
+            jsonStrUp1 = main.ONOS1cli.topologyEventsMetrics()
+            jsonObj1 = json.loads( jsonStrUp1 )
+            graphTimestamp1 = \
+                jsonObj1[ graphTimestamp ][ 'value' ]
+            # Obtain device timestamp. This timestamp captures
+            # the epoch time at which the device event happened
+            deviceTimestamp1 = \
+                jsonObj1[ deviceTimestamp ][ 'value' ]
+            # Get delta between graph event and OFP
+            ptUpGraphToOfp1 = int( graphTimestamp1 ) -\
+                int( timestampBeginPtUp )
+            # Get delta between device event and OFP
+            ptUpDeviceToOfp1 = int( deviceTimestamp1 ) -\
+                int( timestampBeginPtUp )
 
-            if cluster_count >= 7:
-                json_str_up_6 = main.ONOS6cli.topology_events_metrics()
-                json_str_up_7 = main.ONOS7cli.topology_events_metrics()
-                json_obj_6 = json.loads(json_str_up_6)
-                json_obj_7 = json.loads(json_str_up_7)
-                graph_timestamp_6 = \
-                    json_obj_6[graphTimestamp]['value']
-                graph_timestamp_7 = \
-                    json_obj_7[graphTimestamp]['value']
-                device_timestamp_6 = \
-                    json_obj_6[deviceTimestamp]['value'] 
-                device_timestamp_7 = \
-                    json_obj_7[deviceTimestamp]['value'] 
-                pt_up_graph_to_ofp_6 = int(graph_timestamp_6) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_graph_to_ofp_7 = int(graph_timestamp_7) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_6 = int(device_timestamp_6) -\
-                    int(timestamp_begin_pt_up)
-                pt_up_device_to_ofp_7 = int(device_timestamp_7) -\
-                    int(timestamp_begin_pt_up)
+            if clusterCount >= 3:
+                jsonStrUp2 = main.ONOS2cli.topologyEventsMetrics()
+                jsonStrUp3 = main.ONOS3cli.topologyEventsMetrics()
+                jsonObj2 = json.loads( jsonStrUp2 )
+                jsonObj3 = json.loads( jsonStrUp3 )
+                graphTimestamp2 = \
+                    jsonObj2[ graphTimestamp ][ 'value' ]
+                graphTimestamp3 = \
+                    jsonObj3[ graphTimestamp ][ 'value' ]
+                deviceTimestamp2 = \
+                    jsonObj2[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp3 = \
+                    jsonObj3[ deviceTimestamp ][ 'value' ]
+                ptUpGraphToOfp2 = int( graphTimestamp2 ) -\
+                    int( timestampBeginPtUp )
+                ptUpGraphToOfp3 = int( graphTimestamp3 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp2 = int( deviceTimestamp2 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp3 = int( deviceTimestamp3 ) -\
+                    int( timestampBeginPtUp )
             else:
-                pt_up_graph_to_ofp_6 = 0
-                pt_up_graph_to_ofp_7 = 0
-                pt_up_device_to_ofp_6 = 0
-                pt_up_device_to_ofp_7 = 0
+                ptUpGraphToOfp2 = 0
+                ptUpGraphToOfp3 = 0
+                ptUpDeviceToOfp2 = 0
+                ptUpDeviceToOfp3 = 0
 
-            pt_up_graph_to_ofp_avg = \
-                    (int(pt_up_graph_to_ofp_1) + 
-                     int(pt_up_graph_to_ofp_2) +
-                     int(pt_up_graph_to_ofp_3) +
-                     int(pt_up_graph_to_ofp_4) +
-                     int(pt_up_graph_to_ofp_5) +
-                     int(pt_up_graph_to_ofp_6) +
-                     int(pt_up_graph_to_ofp_7)) / cluster_count 
-
-            pt_up_device_to_ofp_avg = \
-                    (int(pt_up_device_to_ofp_1) + 
-                     int(pt_up_device_to_ofp_2) +
-                     int(pt_up_device_to_ofp_3) +
-                     int(pt_up_device_to_ofp_4) +
-                     int(pt_up_device_to_ofp_5) +
-                     int(pt_up_device_to_ofp_6) +
-                     int(pt_up_device_to_ofp_7)) / cluster_count 
-
-            if pt_up_graph_to_ofp_avg > up_threshold_min and \
-                    pt_up_graph_to_ofp_avg < up_threshold_max: 
-                port_up_graph_to_ofp_list.append(
-                        pt_up_graph_to_ofp_avg)
-                main.log.info("Port down: graph to ofp avg: "+
-                    str(pt_up_graph_to_ofp_avg) + " ms")
+            if clusterCount >= 5:
+                jsonStrUp4 = main.ONOS4cli.topologyEventsMetrics()
+                jsonStrUp5 = main.ONOS5cli.topologyEventsMetrics()
+                jsonObj4 = json.loads( jsonStrUp4 )
+                jsonObj5 = json.loads( jsonStrUp5 )
+                graphTimestamp4 = \
+                    jsonObj4[ graphTimestamp ][ 'value' ]
+                graphTimestamp5 = \
+                    jsonObj5[ graphTimestamp ][ 'value' ]
+                deviceTimestamp4 = \
+                    jsonObj4[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp5 = \
+                    jsonObj5[ deviceTimestamp ][ 'value' ]
+                ptUpGraphToOfp4 = int( graphTimestamp4 ) -\
+                    int( timestampBeginPtUp )
+                ptUpGraphToOfp5 = int( graphTimestamp5 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp4 = int( deviceTimestamp4 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp5 = int( deviceTimestamp5 ) -\
+                    int( timestampBeginPtUp )
             else:
-                main.log.info("Average port up graph-to-ofp result"+
-                        " exceeded the threshold: "+
-                        str(pt_up_graph_to_ofp_avg))
-            
-            if pt_up_device_to_ofp_avg > up_threshold_min and \
-                    pt_up_device_to_ofp_avg < up_threshold_max:
-                port_up_device_to_ofp_list.append(
-                        pt_up_device_to_ofp_avg)
-                main.log.info("Port up: device to ofp avg: "+
-                    str(pt_up_device_to_ofp_avg) + " ms")
+                ptUpGraphToOfp4 = 0
+                ptUpGraphToOfp5 = 0
+                ptUpDeviceToOfp4 = 0
+                ptUpDeviceToOfp5 = 0
+
+            if clusterCount >= 7:
+                jsonStrUp6 = main.ONOS6cli.topologyEventsMetrics()
+                jsonStrUp7 = main.ONOS7cli.topologyEventsMetrics()
+                jsonObj6 = json.loads( jsonStrUp6 )
+                jsonObj7 = json.loads( jsonStrUp7 )
+                graphTimestamp6 = \
+                    jsonObj6[ graphTimestamp ][ 'value' ]
+                graphTimestamp7 = \
+                    jsonObj7[ graphTimestamp ][ 'value' ]
+                deviceTimestamp6 = \
+                    jsonObj6[ deviceTimestamp ][ 'value' ]
+                deviceTimestamp7 = \
+                    jsonObj7[ deviceTimestamp ][ 'value' ]
+                ptUpGraphToOfp6 = int( graphTimestamp6 ) -\
+                    int( timestampBeginPtUp )
+                ptUpGraphToOfp7 = int( graphTimestamp7 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp6 = int( deviceTimestamp6 ) -\
+                    int( timestampBeginPtUp )
+                ptUpDeviceToOfp7 = int( deviceTimestamp7 ) -\
+                    int( timestampBeginPtUp )
             else:
-                main.log.info("Average port up device-to-ofp result"+
-                        " exceeded the threshold: "+
-                        str(pt_up_device_to_ofp_avg))
-            
-            #END ITERATION FOR LOOP
-        
-        #Check all list for latency existence and set assertion
-        if (port_down_graph_to_ofp_list and port_down_device_to_ofp_list\
-           and port_up_graph_to_ofp_list and port_up_device_to_ofp_list):
+                ptUpGraphToOfp6 = 0
+                ptUpGraphToOfp7 = 0
+                ptUpDeviceToOfp6 = 0
+                ptUpDeviceToOfp7 = 0
+
+            ptUpGraphToOfpAvg = \
+                ( int( ptUpGraphToOfp1 ) +
+                  int( ptUpGraphToOfp2 ) +
+                  int( ptUpGraphToOfp3 ) +
+                  int( ptUpGraphToOfp4 ) +
+                  int( ptUpGraphToOfp5 ) +
+                  int( ptUpGraphToOfp6 ) +
+                  int( ptUpGraphToOfp7 ) ) / clusterCount
+
+            ptUpDeviceToOfpAvg = \
+                ( int( ptUpDeviceToOfp1 ) +
+                  int( ptUpDeviceToOfp2 ) +
+                  int( ptUpDeviceToOfp3 ) +
+                  int( ptUpDeviceToOfp4 ) +
+                  int( ptUpDeviceToOfp5 ) +
+                  int( ptUpDeviceToOfp6 ) +
+                  int( ptUpDeviceToOfp7 ) ) / clusterCount
+
+            if ptUpGraphToOfpAvg > upThresholdMin and \
+                    ptUpGraphToOfpAvg < upThresholdMax:
+                portUpGraphToOfpList.append(
+                    ptUpGraphToOfpAvg )
+                main.log.info( "Port down: graph to ofp avg: " +
+                               str( ptUpGraphToOfpAvg ) + " ms" )
+            else:
+                main.log.info( "Average port up graph-to-ofp result" +
+                               " exceeded the threshold: " +
+                               str( ptUpGraphToOfpAvg ) )
+
+            if ptUpDeviceToOfpAvg > upThresholdMin and \
+                    ptUpDeviceToOfpAvg < upThresholdMax:
+                portUpDeviceToOfpList.append(
+                    ptUpDeviceToOfpAvg )
+                main.log.info( "Port up: device to ofp avg: " +
+                               str( ptUpDeviceToOfpAvg ) + " ms" )
+            else:
+                main.log.info( "Average port up device-to-ofp result" +
+                               " exceeded the threshold: " +
+                               str( ptUpDeviceToOfpAvg ) )
+
+            # END ITERATION FOR LOOP
+
+        # Check all list for latency existence and set assertion
+        if ( portDownGraphToOfpList and portDownDeviceToOfpList
+                and portUpGraphToOfpList and portUpDeviceToOfpList ):
             assertion = main.TRUE
-        
-        main.log.report("Cluster size: "+str(cluster_count)+\
-                " node(s)")
-        #Calculate and report latency measurements
-        port_down_graph_to_ofp_min = min(port_down_graph_to_ofp_list)
-        port_down_graph_to_ofp_max = max(port_down_graph_to_ofp_list)
-        port_down_graph_to_ofp_avg = \
-                (sum(port_down_graph_to_ofp_list) / 
-                 len(port_down_graph_to_ofp_list))
-        port_down_graph_to_ofp_std_dev = \
-                str(round(numpy.std(port_down_graph_to_ofp_list),1))
-        
-        main.log.report("Port down graph-to-ofp "+
-                "Avg: "+str(port_down_graph_to_ofp_avg)+" ms "+
-                "Std Deviation: "+port_down_graph_to_ofp_std_dev+" ms")
-        
-        port_down_device_to_ofp_min = min(port_down_device_to_ofp_list)
-        port_down_device_to_ofp_max = max(port_down_device_to_ofp_list)
-        port_down_device_to_ofp_avg = \
-                (sum(port_down_device_to_ofp_list) /\
-                 len(port_down_device_to_ofp_list))
-        port_down_device_to_ofp_std_dev = \
-                str(round(numpy.std(port_down_device_to_ofp_list),1))
-        
-        main.log.report("Port down device-to-ofp "+
-                "Avg: "+str(port_down_device_to_ofp_avg)+" ms "+
-                "Std Deviation: "+port_down_device_to_ofp_std_dev+" ms")
-        
-        port_up_graph_to_ofp_min = min(port_up_graph_to_ofp_list)
-        port_up_graph_to_ofp_max = max(port_up_graph_to_ofp_list)
-        port_up_graph_to_ofp_avg = \
-                (sum(port_up_graph_to_ofp_list) /\
-                 len(port_up_graph_to_ofp_list))
-        port_up_graph_to_ofp_std_dev = \
-                str(round(numpy.std(port_up_graph_to_ofp_list),1))
-        
-        main.log.report("Port up graph-to-ofp "+
-                "Avg: "+str(port_up_graph_to_ofp_avg)+" ms "+
-                "Std Deviation: "+port_up_graph_to_ofp_std_dev+" ms")
-          
-        port_up_device_to_ofp_min = min(port_up_device_to_ofp_list)
-        port_up_device_to_ofp_max = max(port_up_device_to_ofp_list)
-        port_up_device_to_ofp_avg = \
-                (sum(port_up_device_to_ofp_list) /\
-                 len(port_up_device_to_ofp_list))
-        port_up_device_to_ofp_std_dev = \
-                str(round(numpy.std(port_up_device_to_ofp_list),1))
-        
-        main.log.report("Port up device-to-ofp "+
-                "Avg: "+str(port_up_device_to_ofp_avg)+" ms "+
-                "Std Deviation: "+port_up_device_to_ofp_std_dev+" ms")
 
-        #Remove switches from controller for next test
-        main.Mininet1.delete_sw_controller("s1")
-        main.Mininet1.delete_sw_controller("s2")
-        
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
-                onpass="Port discovery latency calculation successful",
-                onfail="Port discovery test failed")
+        main.log.report( "Cluster size: " + str( clusterCount ) +
+                         " node(s)" )
+        # Calculate and report latency measurements
+        portDownGraphToOfpMin = min( portDownGraphToOfpList )
+        portDownGraphToOfpMax = max( portDownGraphToOfpList )
+        portDownGraphToOfpAvg = \
+            ( sum( portDownGraphToOfpList ) /
+              len( portDownGraphToOfpList ) )
+        portDownGraphToOfpStdDev = \
+            str( round( numpy.std( portDownGraphToOfpList ), 1 ) )
 
-    def CASE4(self, main):
-        '''
+        main.log.report( "Port down graph-to-ofp " +
+                         "Avg: " + str( portDownGraphToOfpAvg ) + " ms " +
+                         "Std Deviation: " + portDownGraphToOfpStdDev + " ms" )
+
+        portDownDeviceToOfpMin = min( portDownDeviceToOfpList )
+        portDownDeviceToOfpMax = max( portDownDeviceToOfpList )
+        portDownDeviceToOfpAvg = \
+            ( sum( portDownDeviceToOfpList ) /
+              len( portDownDeviceToOfpList ) )
+        portDownDeviceToOfpStdDev = \
+            str( round( numpy.std( portDownDeviceToOfpList ), 1 ) )
+
+        main.log.report(
+            "Port down device-to-ofp " +
+            "Avg: " +
+            str( portDownDeviceToOfpAvg ) +
+            " ms " +
+            "Std Deviation: " +
+            portDownDeviceToOfpStdDev +
+            " ms" )
+
+        portUpGraphToOfpMin = min( portUpGraphToOfpList )
+        portUpGraphToOfpMax = max( portUpGraphToOfpList )
+        portUpGraphToOfpAvg = \
+            ( sum( portUpGraphToOfpList ) /
+              len( portUpGraphToOfpList ) )
+        portUpGraphToOfpStdDev = \
+            str( round( numpy.std( portUpGraphToOfpList ), 1 ) )
+
+        main.log.report( "Port up graph-to-ofp " +
+                         "Avg: " + str( portUpGraphToOfpAvg ) + " ms " +
+                         "Std Deviation: " + portUpGraphToOfpStdDev + " ms" )
+
+        portUpDeviceToOfpMin = min( portUpDeviceToOfpList )
+        portUpDeviceToOfpMax = max( portUpDeviceToOfpList )
+        portUpDeviceToOfpAvg = \
+            ( sum( portUpDeviceToOfpList ) /
+              len( portUpDeviceToOfpList ) )
+        portUpDeviceToOfpStdDev = \
+            str( round( numpy.std( portUpDeviceToOfpList ), 1 ) )
+
+        main.log.report( "Port up device-to-ofp " +
+                         "Avg: " + str( portUpDeviceToOfpAvg ) + " ms " +
+                         "Std Deviation: " + portUpDeviceToOfpStdDev + " ms" )
+
+        # Remove switches from controller for next test
+        main.Mininet1.deleteSwController( "s1" )
+        main.Mininet1.deleteSwController( "s2" )
+
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=assertion,
+            onpass="Port discovery latency calculation successful",
+            onfail="Port discovery test failed" )
+
+    def CASE4( self, main ):
+        """
         Link down event using loss rate 100%
-        
+
         Important:
             Use a simple 2 switch topology with 1 link between
-            the two switches. Ensure that mac addresses of the 
+            the two switches. Ensure that mac addresses of the
             switches are 1 / 2 respectively
-        '''
+        """
         import time
         import subprocess
         import os
         import requests
         import json
-        import numpy 
-    
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS_user = main.params['CTRL']['user']
+        import numpy
 
-        default_sw_port = main.params['CTRL']['port1']
-       
-        #Number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-       
-        #Timestamp 'keys' for json metrics output.
-        #These are subject to change, hence moved into params
-        deviceTimestamp = main.params['JSON']['deviceTimestamp']
-        linkTimestamp = main.params['JSON']['linkTimestamp'] 
-        graphTimestamp = main.params['JSON']['graphTimestamp']
-        
-        debug_mode = main.params['TEST']['debugMode']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        local_time = time.strftime('%x %X')
-        local_time = local_time.replace("/","")
-        local_time = local_time.replace(" ","_")
-        local_time = local_time.replace(":","")
-        if debug_mode == 'on':
-            main.ONOS1.tshark_pcap("eth0",
-                    "/tmp/link_lat_pcap_"+local_time) 
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #Threshold for this test case
-        up_threshold_str = main.params['TEST']['linkUpThreshold']
-        down_threshold_str = main.params['TEST']['linkDownThreshold']
+        # Number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
 
-        up_threshold_obj = up_threshold_str.split(",")
-        down_threshold_obj = down_threshold_str.split(",")
+        # Timestamp 'keys' for json metrics output.
+        # These are subject to change, hence moved into params
+        deviceTimestamp = main.params[ 'JSON' ][ 'deviceTimestamp' ]
+        linkTimestamp = main.params[ 'JSON' ][ 'linkTimestamp' ]
+        graphTimestamp = main.params[ 'JSON' ][ 'graphTimestamp' ]
 
-        up_threshold_min = int(up_threshold_obj[0])
-        up_threshold_max = int(up_threshold_obj[1])
+        debugMode = main.params[ 'TEST' ][ 'debugMode' ]
 
-        down_threshold_min = int(down_threshold_obj[0])
-        down_threshold_max = int(down_threshold_obj[1])
+        localTime = time.strftime( '%x %X' )
+        localTime = localTime.replace( "/", "" )
+        localTime = localTime.replace( " ", "_" )
+        localTime = localTime.replace( ":", "" )
+        if debugMode == 'on':
+            main.ONOS1.tsharkPcap( "eth0",
+                                   "/tmp/link_lat_pcap_" + localTime )
+
+        # Threshold for this test case
+        upThresholdStr = main.params[ 'TEST' ][ 'linkUpThreshold' ]
+        downThresholdStr = main.params[ 'TEST' ][ 'linkDownThreshold' ]
+
+        upThresholdObj = upThresholdStr.split( "," )
+        downThresholdObj = downThresholdStr.split( "," )
+
+        upThresholdMin = int( upThresholdObj[ 0 ] )
+        upThresholdMax = int( upThresholdObj[ 1 ] )
+
+        downThresholdMin = int( downThresholdObj[ 0 ] )
+        downThresholdMax = int( downThresholdObj[ 1 ] )
 
         assertion = main.TRUE
-        #Link event timestamp to system time list
-        link_down_link_to_system_list = []
-        link_up_link_to_system_list = []
-        #Graph event timestamp to system time list
-        link_down_graph_to_system_list = []
-        link_up_graph_to_system_list = [] 
+        # Link event timestamp to system time list
+        linkDownLinkToSystemList = []
+        linkUpLinkToSystemList = []
+        # Graph event timestamp to system time list
+        linkDownGraphToSystemList = []
+        linkUpGraphToSystemList = []
 
-        main.log.report("Link up / down discovery latency between "+
-                "two switches")
-        main.log.report("Simulated by setting loss-rate 100%")
-        main.log.report("'tc qdisc add dev <intfs> root netem loss 100%'") 
-        main.log.report("Total iterations of test: "+str(num_iter))
+        main.log.report( "Link up / down discovery latency between " +
+                         "two switches" )
+        main.log.report( "Simulated by setting loss-rate 100%" )
+        main.log.report( "'tc qdisc add dev <intfs> root netem loss 100%'" )
+        main.log.report( "Total iterations of test: " + str( numIter ) )
 
-        main.step("Assign all switches")
-        main.Mininet1.assign_sw_controller(sw="1",
-                ip1=ONOS1_ip, port1=default_sw_port)
-        main.Mininet1.assign_sw_controller(sw="2",
-                ip1=ONOS1_ip, port1=default_sw_port)
+        main.step( "Assign all switches" )
+        main.Mininet1.assignSwController( sw="1",
+                                           ip1=ONOS1Ip, port1=defaultSwPort )
+        main.Mininet1.assignSwController( sw="2",
+                                           ip1=ONOS1Ip, port1=defaultSwPort )
 
-        main.step("Verifying switch assignment")
-        result_s1 = main.Mininet1.get_sw_controller(sw="s1")
-        result_s2 = main.Mininet1.get_sw_controller(sw="s2")
-          
-        #Allow time for events to finish before taking measurements
-        time.sleep(10)
+        main.step( "Verifying switch assignment" )
+        resultS1 = main.Mininet1.getSwController( sw="s1" )
+        resultS2 = main.Mininet1.getSwController( sw="s2" )
 
-        link_down1 = False
-        link_down2 = False
-        link_down3 = False
-        #Start iteration of link event test
-        for i in range(0, int(num_iter)):
-            main.step("Getting initial system time as t0")
-        
-            #System time in epoch ms
-            timestamp_link_down_t0 = time.time() * 1000
-            #Link down is simulated by 100% loss rate using traffic 
-            #control command
+        # Allow time for events to finish before taking measurements
+        time.sleep( 10 )
+
+        linkDown1 = False
+        linkDown2 = False
+        linkDown3 = False
+        # Start iteration of link event test
+        for i in range( 0, int( numIter ) ):
+            main.step( "Getting initial system time as t0" )
+
+            # System time in epoch ms
+            timestampLinkDownT0 = time.time() * 1000
+            # Link down is simulated by 100% loss rate using traffic
+            # control command
             main.Mininet1.handle.sendline(
-                    "sh tc qdisc add dev s1-eth1 root netem loss 100%")
+                "sh tc qdisc add dev s1-eth1 root netem loss 100%" )
 
-            #TODO: Iterate through 'links' command to verify that
-            #      link s1 -> s2 went down (loop timeout 30 seconds) 
+            # TODO: Iterate through 'links' command to verify that
+            #      link s1 -> s2 went down ( loop timeout 30 seconds )
             #      on all 3 ONOS instances
-            main.log.info("Checking ONOS for link update")
-            loop_count = 0
-            while( not (link_down1 and link_down2 and link_down3)\
-                    and loop_count < 30 ):
-                json_str1 = main.ONOS1cli.links()
-                json_str2 = main.ONOS2cli.links()
-                json_str3 = main.ONOS3cli.links()
-                
-                if not (json_str1 and json_str2 and json_str3):
-                    main.log.error("CLI command returned error ")
+            main.log.info( "Checking ONOS for link update" )
+            loopCount = 0
+            while( not ( linkDown1 and linkDown2 and linkDown3 )
+                    and loopCount < 30 ):
+                jsonStr1 = main.ONOS1cli.links()
+                jsonStr2 = main.ONOS2cli.links()
+                jsonStr3 = main.ONOS3cli.links()
+
+                if not ( jsonStr1 and jsonStr2 and jsonStr3 ):
+                    main.log.error( "CLI command returned error " )
                     break
                 else:
-                    json_obj1 = json.loads(json_str1)
-                    json_obj2 = json.loads(json_str2)
-                    json_obj3 = json.loads(json_str3)
-                for obj1 in json_obj1:
-                    if '01' not in obj1['src']['device']:
-                        link_down1 = True
-                        main.log.info("Link down from "+
-                                "s1 -> s2 on ONOS1 detected")
-                for obj2 in json_obj2:
-                    if '01' not in obj2['src']['device']:
-                        link_down2 = True
-                        main.log.info("Link down from "+
-                                "s1 -> s2 on ONOS2 detected")
-                for obj3 in json_obj3:
-                    if '01' not in obj3['src']['device']:
-                        link_down3 = True
-                        main.log.info("Link down from "+
-                                "s1 -> s2 on ONOS3 detected")
-                
-                loop_count += 1
-                #If CLI doesn't like the continuous requests
-                #and exits in this loop, increase the sleep here.
-                #Consequently, while loop timeout will increase
-                time.sleep(1)
-    
-            #Give time for metrics measurement to catch up
-            #NOTE: May need to be configured more accurately
-            time.sleep(10)
-            #If we exited the while loop and link down 1,2,3 are still 
-            #false, then ONOS has failed to discover link down event
-            if not (link_down1 and link_down2 and link_down3):
-                main.log.info("Link down discovery failed")
-                
-                link_down_lat_graph1 = 0
-                link_down_lat_graph2 = 0
-                link_down_lat_graph3 = 0
-                link_down_lat_device1 = 0
-                link_down_lat_device2 = 0
-                link_down_lat_device3 = 0
-                
+                    jsonObj1 = json.loads( jsonStr1 )
+                    jsonObj2 = json.loads( jsonStr2 )
+                    jsonObj3 = json.loads( jsonStr3 )
+                for obj1 in jsonObj1:
+                    if '01' not in obj1[ 'src' ][ 'device' ]:
+                        linkDown1 = True
+                        main.log.info( "Link down from " +
+                                       "s1 -> s2 on ONOS1 detected" )
+                for obj2 in jsonObj2:
+                    if '01' not in obj2[ 'src' ][ 'device' ]:
+                        linkDown2 = True
+                        main.log.info( "Link down from " +
+                                       "s1 -> s2 on ONOS2 detected" )
+                for obj3 in jsonObj3:
+                    if '01' not in obj3[ 'src' ][ 'device' ]:
+                        linkDown3 = True
+                        main.log.info( "Link down from " +
+                                       "s1 -> s2 on ONOS3 detected" )
+
+                loopCount += 1
+                # If CLI doesn't like the continuous requests
+                # and exits in this loop, increase the sleep here.
+                # Consequently, while loop timeout will increase
+                time.sleep( 1 )
+
+            # Give time for metrics measurement to catch up
+            # NOTE: May need to be configured more accurately
+            time.sleep( 10 )
+            # If we exited the while loop and link down 1,2,3 are still
+            # false, then ONOS has failed to discover link down event
+            if not ( linkDown1 and linkDown2 and linkDown3 ):
+                main.log.info( "Link down discovery failed" )
+
+                linkDownLatGraph1 = 0
+                linkDownLatGraph2 = 0
+                linkDownLatGraph3 = 0
+                linkDownLatDevice1 = 0
+                linkDownLatDevice2 = 0
+                linkDownLatDevice3 = 0
+
                 assertion = main.FALSE
             else:
-                json_topo_metrics_1 =\
-                        main.ONOS1cli.topology_events_metrics()
-                json_topo_metrics_2 =\
-                        main.ONOS2cli.topology_events_metrics()
-                json_topo_metrics_3 =\
-                        main.ONOS3cli.topology_events_metrics()
-                json_topo_metrics_1 = json.loads(json_topo_metrics_1)
-                json_topo_metrics_2 = json.loads(json_topo_metrics_2)
-                json_topo_metrics_3 = json.loads(json_topo_metrics_3)
+                jsonTopoMetrics1 =\
+                    main.ONOS1cli.topologyEventsMetrics()
+                jsonTopoMetrics2 =\
+                    main.ONOS2cli.topologyEventsMetrics()
+                jsonTopoMetrics3 =\
+                    main.ONOS3cli.topologyEventsMetrics()
+                jsonTopoMetrics1 = json.loads( jsonTopoMetrics1 )
+                jsonTopoMetrics2 = json.loads( jsonTopoMetrics2 )
+                jsonTopoMetrics3 = json.loads( jsonTopoMetrics3 )
 
-                main.log.info("Obtaining graph and device timestamp")
-                graph_timestamp_1 = \
-                    json_topo_metrics_1[graphTimestamp]['value']
-                graph_timestamp_2 = \
-                    json_topo_metrics_2[graphTimestamp]['value']
-                graph_timestamp_3 = \
-                    json_topo_metrics_3[graphTimestamp]['value']
+                main.log.info( "Obtaining graph and device timestamp" )
+                graphTimestamp1 = \
+                    jsonTopoMetrics1[ graphTimestamp ][ 'value' ]
+                graphTimestamp2 = \
+                    jsonTopoMetrics2[ graphTimestamp ][ 'value' ]
+                graphTimestamp3 = \
+                    jsonTopoMetrics3[ graphTimestamp ][ 'value' ]
 
-                link_timestamp_1 = \
-                    json_topo_metrics_1[linkTimestamp]['value']
-                link_timestamp_2 = \
-                    json_topo_metrics_2[linkTimestamp]['value']
-                link_timestamp_3 = \
-                    json_topo_metrics_3[linkTimestamp]['value']
+                linkTimestamp1 = \
+                    jsonTopoMetrics1[ linkTimestamp ][ 'value' ]
+                linkTimestamp2 = \
+                    jsonTopoMetrics2[ linkTimestamp ][ 'value' ]
+                linkTimestamp3 = \
+                    jsonTopoMetrics3[ linkTimestamp ][ 'value' ]
 
-                if graph_timestamp_1 and graph_timestamp_2 and\
-                        graph_timestamp_3 and link_timestamp_1 and\
-                        link_timestamp_2 and link_timestamp_3:
-                    link_down_lat_graph1 = int(graph_timestamp_1) -\
-                            int(timestamp_link_down_t0)
-                    link_down_lat_graph2 = int(graph_timestamp_2) -\
-                            int(timestamp_link_down_t0)
-                    link_down_lat_graph3 = int(graph_timestamp_3) -\
-                            int(timestamp_link_down_t0)
-                
-                    link_down_lat_link1 = int(link_timestamp_1) -\
-                            int(timestamp_link_down_t0)
-                    link_down_lat_link2 = int(link_timestamp_2) -\
-                            int(timestamp_link_down_t0)
-                    link_down_lat_link3 = int(link_timestamp_3) -\
-                            int(timestamp_link_down_t0)
+                if graphTimestamp1 and graphTimestamp2 and\
+                        graphTimestamp3 and linkTimestamp1 and\
+                        linkTimestamp2 and linkTimestamp3:
+                    linkDownLatGraph1 = int( graphTimestamp1 ) -\
+                        int( timestampLinkDownT0 )
+                    linkDownLatGraph2 = int( graphTimestamp2 ) -\
+                        int( timestampLinkDownT0 )
+                    linkDownLatGraph3 = int( graphTimestamp3 ) -\
+                        int( timestampLinkDownT0 )
+
+                    linkDownLatLink1 = int( linkTimestamp1 ) -\
+                        int( timestampLinkDownT0 )
+                    linkDownLatLink2 = int( linkTimestamp2 ) -\
+                        int( timestampLinkDownT0 )
+                    linkDownLatLink3 = int( linkTimestamp3 ) -\
+                        int( timestampLinkDownT0 )
                 else:
-                    main.log.error("There was an error calculating"+
-                        " the delta for link down event")
-                    link_down_lat_graph1 = 0
-                    link_down_lat_graph2 = 0
-                    link_down_lat_graph3 = 0
-                    
-                    link_down_lat_device1 = 0
-                    link_down_lat_device2 = 0
-                    link_down_lat_device3 = 0
-        
-            main.log.info("Link down latency ONOS1 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_down_lat_graph1)+" ms")
-            main.log.info("Link down latency ONOS2 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_down_lat_graph2)+" ms")
-            main.log.info("Link down latency ONOS3 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_down_lat_graph3)+" ms")
-            
-            main.log.info("Link down latency ONOS1 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_down_lat_link1)+" ms")
-            main.log.info("Link down latency ONOS2 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_down_lat_link2)+" ms")
-            main.log.info("Link down latency ONOS3 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_down_lat_link3))
-      
-            #Calculate avg of node calculations
-            link_down_lat_graph_avg =\
-                    (link_down_lat_graph1 +
-                     link_down_lat_graph2 +
-                     link_down_lat_graph3) / 3
-            link_down_lat_link_avg =\
-                    (link_down_lat_link1 +
-                     link_down_lat_link2 +
-                     link_down_lat_link3) / 3
+                    main.log.error( "There was an error calculating" +
+                                    " the delta for link down event" )
+                    linkDownLatGraph1 = 0
+                    linkDownLatGraph2 = 0
+                    linkDownLatGraph3 = 0
 
-            #Set threshold and append latency to list
-            if link_down_lat_graph_avg > down_threshold_min and\
-               link_down_lat_graph_avg < down_threshold_max:
-                link_down_graph_to_system_list.append(
-                        link_down_lat_graph_avg)
-            else:
-                main.log.info("Link down latency exceeded threshold")
-                main.log.info("Results for iteration "+str(i)+
-                        "have been omitted")
-            if link_down_lat_link_avg > down_threshold_min and\
-               link_down_lat_link_avg < down_threshold_max:
-                link_down_link_to_system_list.append(
-                        link_down_lat_link_avg)
-            else:
-                main.log.info("Link down latency exceeded threshold")
-                main.log.info("Results for iteration "+str(i)+
-                        "have been omitted")
+                    linkDownLatDevice1 = 0
+                    linkDownLatDevice2 = 0
+                    linkDownLatDevice3 = 0
 
-            #NOTE: To remove loss rate and measure latency:
+            main.log.info( "Link down latency ONOS1 iteration " +
+                           str( i ) + " (end-to-end): " +
+                           str( linkDownLatGraph1 ) + " ms" )
+            main.log.info( "Link down latency ONOS2 iteration " +
+                           str( i ) + " (end-to-end): " +
+                           str( linkDownLatGraph2 ) + " ms" )
+            main.log.info( "Link down latency ONOS3 iteration " +
+                           str( i ) + " (end-to-end): " +
+                           str( linkDownLatGraph3 ) + " ms" )
+
+            main.log.info( "Link down latency ONOS1 iteration " +
+                           str( i ) + " (link-event-to-system-timestamp): " +
+                           str( linkDownLatLink1 ) + " ms" )
+            main.log.info( "Link down latency ONOS2 iteration " +
+                           str( i ) + " (link-event-to-system-timestamp): " +
+                           str( linkDownLatLink2 ) + " ms" )
+            main.log.info( "Link down latency ONOS3 iteration " +
+                           str( i ) + " (link-event-to-system-timestamp): " +
+                           str( linkDownLatLink3 ) )
+
+            # Calculate avg of node calculations
+            linkDownLatGraphAvg =\
+                ( linkDownLatGraph1 +
+                  linkDownLatGraph2 +
+                  linkDownLatGraph3 ) / 3
+            linkDownLatLinkAvg =\
+                ( linkDownLatLink1 +
+                  linkDownLatLink2 +
+                  linkDownLatLink3 ) / 3
+
+            # Set threshold and append latency to list
+            if linkDownLatGraphAvg > downThresholdMin and\
+               linkDownLatGraphAvg < downThresholdMax:
+                linkDownGraphToSystemList.append(
+                    linkDownLatGraphAvg )
+            else:
+                main.log.info( "Link down latency exceeded threshold" )
+                main.log.info( "Results for iteration " + str( i ) +
+                               "have been omitted" )
+            if linkDownLatLinkAvg > downThresholdMin and\
+               linkDownLatLinkAvg < downThresholdMax:
+                linkDownLinkToSystemList.append(
+                    linkDownLatLinkAvg )
+            else:
+                main.log.info( "Link down latency exceeded threshold" )
+                main.log.info( "Results for iteration " + str( i ) +
+                               "have been omitted" )
+
+            # NOTE: To remove loss rate and measure latency:
             #       'sh tc qdisc del dev s1-eth1 root'
-            timestamp_link_up_t0 = time.time() * 1000
-            main.Mininet1.handle.sendline("sh tc qdisc del dev "+
-                    "s1-eth1 root")
-            main.Mininet1.handle.expect("mininet>")
-            
-            main.log.info("Checking ONOS for link update")
-            
-            link_down1 = True
-            link_down2 = True
-            link_down3 = True
-            loop_count = 0
-            while( (link_down1 and link_down2 and link_down3)\
-                    and loop_count < 30 ):
-                json_str1 = main.ONOS1cli.links()
-                json_str2 = main.ONOS2cli.links()
-                json_str3 = main.ONOS3cli.links()
-                if not (json_str1 and json_str2 and json_str3):
-                    main.log.error("CLI command returned error ")
+            timestampLinkUpT0 = time.time() * 1000
+            main.Mininet1.handle.sendline( "sh tc qdisc del dev " +
+                                           "s1-eth1 root" )
+            main.Mininet1.handle.expect( "mininet>" )
+
+            main.log.info( "Checking ONOS for link update" )
+
+            linkDown1 = True
+            linkDown2 = True
+            linkDown3 = True
+            loopCount = 0
+            while( ( linkDown1 and linkDown2 and linkDown3 )
+                    and loopCount < 30 ):
+                jsonStr1 = main.ONOS1cli.links()
+                jsonStr2 = main.ONOS2cli.links()
+                jsonStr3 = main.ONOS3cli.links()
+                if not ( jsonStr1 and jsonStr2 and jsonStr3 ):
+                    main.log.error( "CLI command returned error " )
                     break
                 else:
-                    json_obj1 = json.loads(json_str1)
-                    json_obj2 = json.loads(json_str2)
-                    json_obj3 = json.loads(json_str3)
-                
-                for obj1 in json_obj1:
-                    if '01' in obj1['src']['device']:
-                        link_down1 = False 
-                        main.log.info("Link up from "+
-                            "s1 -> s2 on ONOS1 detected")
-                for obj2 in json_obj2:
-                    if '01' in obj2['src']['device']:
-                        link_down2 = False 
-                        main.log.info("Link up from "+
-                            "s1 -> s2 on ONOS2 detected")
-                for obj3 in json_obj3:
-                    if '01' in obj3['src']['device']:
-                        link_down3 = False 
-                        main.log.info("Link up from "+
-                            "s1 -> s2 on ONOS3 detected")
-                
-                loop_count += 1
-                time.sleep(1)
-            
-            if (link_down1 and link_down2 and link_down3):
-                main.log.info("Link up discovery failed")
-                
-                link_up_lat_graph1 = 0
-                link_up_lat_graph2 = 0
-                link_up_lat_graph3 = 0
-                link_up_lat_device1 = 0
-                link_up_lat_device2 = 0
-                link_up_lat_device3 = 0
-                
+                    jsonObj1 = json.loads( jsonStr1 )
+                    jsonObj2 = json.loads( jsonStr2 )
+                    jsonObj3 = json.loads( jsonStr3 )
+
+                for obj1 in jsonObj1:
+                    if '01' in obj1[ 'src' ][ 'device' ]:
+                        linkDown1 = False
+                        main.log.info( "Link up from " +
+                                       "s1 -> s2 on ONOS1 detected" )
+                for obj2 in jsonObj2:
+                    if '01' in obj2[ 'src' ][ 'device' ]:
+                        linkDown2 = False
+                        main.log.info( "Link up from " +
+                                       "s1 -> s2 on ONOS2 detected" )
+                for obj3 in jsonObj3:
+                    if '01' in obj3[ 'src' ][ 'device' ]:
+                        linkDown3 = False
+                        main.log.info( "Link up from " +
+                                       "s1 -> s2 on ONOS3 detected" )
+
+                loopCount += 1
+                time.sleep( 1 )
+
+            if ( linkDown1 and linkDown2 and linkDown3 ):
+                main.log.info( "Link up discovery failed" )
+
+                linkUpLatGraph1 = 0
+                linkUpLatGraph2 = 0
+                linkUpLatGraph3 = 0
+                linkUpLatDevice1 = 0
+                linkUpLatDevice2 = 0
+                linkUpLatDevice3 = 0
+
                 assertion = main.FALSE
             else:
-                json_topo_metrics_1 =\
-                        main.ONOS1cli.topology_events_metrics()
-                json_topo_metrics_2 =\
-                        main.ONOS2cli.topology_events_metrics()
-                json_topo_metrics_3 =\
-                        main.ONOS3cli.topology_events_metrics()
-                json_topo_metrics_1 = json.loads(json_topo_metrics_1)
-                json_topo_metrics_2 = json.loads(json_topo_metrics_2)
-                json_topo_metrics_3 = json.loads(json_topo_metrics_3)
+                jsonTopoMetrics1 =\
+                    main.ONOS1cli.topologyEventsMetrics()
+                jsonTopoMetrics2 =\
+                    main.ONOS2cli.topologyEventsMetrics()
+                jsonTopoMetrics3 =\
+                    main.ONOS3cli.topologyEventsMetrics()
+                jsonTopoMetrics1 = json.loads( jsonTopoMetrics1 )
+                jsonTopoMetrics2 = json.loads( jsonTopoMetrics2 )
+                jsonTopoMetrics3 = json.loads( jsonTopoMetrics3 )
 
-                main.log.info("Obtaining graph and device timestamp")
-                graph_timestamp_1 = \
-                    json_topo_metrics_1[graphTimestamp]['value']
-                graph_timestamp_2 = \
-                    json_topo_metrics_2[graphTimestamp]['value']
-                graph_timestamp_3 = \
-                    json_topo_metrics_3[graphTimestamp]['value']
+                main.log.info( "Obtaining graph and device timestamp" )
+                graphTimestamp1 = \
+                    jsonTopoMetrics1[ graphTimestamp ][ 'value' ]
+                graphTimestamp2 = \
+                    jsonTopoMetrics2[ graphTimestamp ][ 'value' ]
+                graphTimestamp3 = \
+                    jsonTopoMetrics3[ graphTimestamp ][ 'value' ]
 
-                link_timestamp_1 = \
-                    json_topo_metrics_1[linkTimestamp]['value']
-                link_timestamp_2 = \
-                    json_topo_metrics_2[linkTimestamp]['value']
-                link_timestamp_3 = \
-                    json_topo_metrics_3[linkTimestamp]['value']
+                linkTimestamp1 = \
+                    jsonTopoMetrics1[ linkTimestamp ][ 'value' ]
+                linkTimestamp2 = \
+                    jsonTopoMetrics2[ linkTimestamp ][ 'value' ]
+                linkTimestamp3 = \
+                    jsonTopoMetrics3[ linkTimestamp ][ 'value' ]
 
-                if graph_timestamp_1 and graph_timestamp_2 and\
-                        graph_timestamp_3 and link_timestamp_1 and\
-                        link_timestamp_2 and link_timestamp_3:
-                    link_up_lat_graph1 = int(graph_timestamp_1) -\
-                            int(timestamp_link_up_t0)
-                    link_up_lat_graph2 = int(graph_timestamp_2) -\
-                            int(timestamp_link_up_t0)
-                    link_up_lat_graph3 = int(graph_timestamp_3) -\
-                            int(timestamp_link_up_t0)
-                
-                    link_up_lat_link1 = int(link_timestamp_1) -\
-                            int(timestamp_link_up_t0)
-                    link_up_lat_link2 = int(link_timestamp_2) -\
-                            int(timestamp_link_up_t0)
-                    link_up_lat_link3 = int(link_timestamp_3) -\
-                            int(timestamp_link_up_t0)
+                if graphTimestamp1 and graphTimestamp2 and\
+                        graphTimestamp3 and linkTimestamp1 and\
+                        linkTimestamp2 and linkTimestamp3:
+                    linkUpLatGraph1 = int( graphTimestamp1 ) -\
+                        int( timestampLinkUpT0 )
+                    linkUpLatGraph2 = int( graphTimestamp2 ) -\
+                        int( timestampLinkUpT0 )
+                    linkUpLatGraph3 = int( graphTimestamp3 ) -\
+                        int( timestampLinkUpT0 )
+
+                    linkUpLatLink1 = int( linkTimestamp1 ) -\
+                        int( timestampLinkUpT0 )
+                    linkUpLatLink2 = int( linkTimestamp2 ) -\
+                        int( timestampLinkUpT0 )
+                    linkUpLatLink3 = int( linkTimestamp3 ) -\
+                        int( timestampLinkUpT0 )
                 else:
-                    main.log.error("There was an error calculating"+
-                        " the delta for link down event")
-                    link_up_lat_graph1 = 0
-                    link_up_lat_graph2 = 0
-                    link_up_lat_graph3 = 0
-                    
-                    link_up_lat_device1 = 0
-                    link_up_lat_device2 = 0
-                    link_up_lat_device3 = 0
-       
-            if debug_mode == 'on':
-                main.log.info("Link up latency ONOS1 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_up_lat_graph1)+" ms")
-                main.log.info("Link up latency ONOS2 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_up_lat_graph2)+" ms")
-                main.log.info("Link up latency ONOS3 iteration "+
-                    str(i)+" (end-to-end): "+
-                    str(link_up_lat_graph3)+" ms")
-            
-                main.log.info("Link up latency ONOS1 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_up_lat_link1)+" ms")
-                main.log.info("Link up latency ONOS2 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_up_lat_link2)+" ms")
-                main.log.info("Link up latency ONOS3 iteration "+
-                    str(i)+" (link-event-to-system-timestamp): "+
-                    str(link_up_lat_link3))
-      
-            #Calculate avg of node calculations
-            link_up_lat_graph_avg =\
-                    (link_up_lat_graph1 +
-                     link_up_lat_graph2 +
-                     link_up_lat_graph3) / 3
-            link_up_lat_link_avg =\
-                    (link_up_lat_link1 +
-                     link_up_lat_link2 +
-                     link_up_lat_link3) / 3
+                    main.log.error( "There was an error calculating" +
+                                    " the delta for link down event" )
+                    linkUpLatGraph1 = 0
+                    linkUpLatGraph2 = 0
+                    linkUpLatGraph3 = 0
 
-            #Set threshold and append latency to list
-            if link_up_lat_graph_avg > up_threshold_min and\
-               link_up_lat_graph_avg < up_threshold_max:
-                link_up_graph_to_system_list.append(
-                        link_up_lat_graph_avg)
+                    linkUpLatDevice1 = 0
+                    linkUpLatDevice2 = 0
+                    linkUpLatDevice3 = 0
+
+            if debugMode == 'on':
+                main.log.info( "Link up latency ONOS1 iteration " +
+                               str( i ) + " (end-to-end): " +
+                               str( linkUpLatGraph1 ) + " ms" )
+                main.log.info( "Link up latency ONOS2 iteration " +
+                               str( i ) + " (end-to-end): " +
+                               str( linkUpLatGraph2 ) + " ms" )
+                main.log.info( "Link up latency ONOS3 iteration " +
+                               str( i ) + " (end-to-end): " +
+                               str( linkUpLatGraph3 ) + " ms" )
+
+                main.log.info(
+                    "Link up latency ONOS1 iteration " +
+                    str( i ) +
+                    " (link-event-to-system-timestamp): " +
+                    str( linkUpLatLink1 ) +
+                    " ms" )
+                main.log.info(
+                    "Link up latency ONOS2 iteration " +
+                    str( i ) +
+                    " (link-event-to-system-timestamp): " +
+                    str( linkUpLatLink2 ) +
+                    " ms" )
+                main.log.info(
+                    "Link up latency ONOS3 iteration " +
+                    str( i ) +
+                    " (link-event-to-system-timestamp): " +
+                    str( linkUpLatLink3 ) )
+
+            # Calculate avg of node calculations
+            linkUpLatGraphAvg =\
+                ( linkUpLatGraph1 +
+                  linkUpLatGraph2 +
+                  linkUpLatGraph3 ) / 3
+            linkUpLatLinkAvg =\
+                ( linkUpLatLink1 +
+                  linkUpLatLink2 +
+                  linkUpLatLink3 ) / 3
+
+            # Set threshold and append latency to list
+            if linkUpLatGraphAvg > upThresholdMin and\
+               linkUpLatGraphAvg < upThresholdMax:
+                linkUpGraphToSystemList.append(
+                    linkUpLatGraphAvg )
             else:
-                main.log.info("Link up latency exceeded threshold")
-                main.log.info("Results for iteration "+str(i)+
-                        "have been omitted")
-            if link_up_lat_link_avg > up_threshold_min and\
-               link_up_lat_link_avg < up_threshold_max:
-                link_up_link_to_system_list.append(
-                        link_up_lat_link_avg)
+                main.log.info( "Link up latency exceeded threshold" )
+                main.log.info( "Results for iteration " + str( i ) +
+                               "have been omitted" )
+            if linkUpLatLinkAvg > upThresholdMin and\
+               linkUpLatLinkAvg < upThresholdMax:
+                linkUpLinkToSystemList.append(
+                    linkUpLatLinkAvg )
             else:
-                main.log.info("Link up latency exceeded threshold")
-                main.log.info("Results for iteration "+str(i)+
-                        "have been omitted")
+                main.log.info( "Link up latency exceeded threshold" )
+                main.log.info( "Results for iteration " + str( i ) +
+                               "have been omitted" )
 
-        #Calculate min, max, avg of list and report
-        link_down_min = min(link_down_graph_to_system_list)
-        link_down_max = max(link_down_graph_to_system_list)
-        link_down_avg = sum(link_down_graph_to_system_list) / \
-                        len(link_down_graph_to_system_list)
-        link_up_min = min(link_up_graph_to_system_list)
-        link_up_max = max(link_up_graph_to_system_list)
-        link_up_avg = sum(link_up_graph_to_system_list) / \
-                        len(link_up_graph_to_system_list)
-        link_down_std_dev = \
-                str(round(numpy.std(link_down_graph_to_system_list),1))
-        link_up_std_dev = \
-                str(round(numpy.std(link_up_graph_to_system_list),1))
+        # Calculate min, max, avg of list and report
+        linkDownMin = min( linkDownGraphToSystemList )
+        linkDownMax = max( linkDownGraphToSystemList )
+        linkDownAvg = sum( linkDownGraphToSystemList ) / \
+            len( linkDownGraphToSystemList )
+        linkUpMin = min( linkUpGraphToSystemList )
+        linkUpMax = max( linkUpGraphToSystemList )
+        linkUpAvg = sum( linkUpGraphToSystemList ) / \
+            len( linkUpGraphToSystemList )
+        linkDownStdDev = \
+            str( round( numpy.std( linkDownGraphToSystemList ), 1 ) )
+        linkUpStdDev = \
+            str( round( numpy.std( linkUpGraphToSystemList ), 1 ) )
 
-        main.log.report("Link down latency " +
-                "Avg: "+str(link_down_avg)+" ms "+
-                "Std Deviation: "+link_down_std_dev+" ms")
-        main.log.report("Link up latency "+
-                "Avg: "+str(link_up_avg)+" ms "+
-                "Std Deviation: "+link_up_std_dev+" ms")
+        main.log.report( "Link down latency " +
+                         "Avg: " + str( linkDownAvg ) + " ms " +
+                         "Std Deviation: " + linkDownStdDev + " ms" )
+        main.log.report( "Link up latency " +
+                         "Avg: " + str( linkUpAvg ) + " ms " +
+                         "Std Deviation: " + linkUpStdDev + " ms" )
 
-        utilities.assert_equals(expect=main.TRUE, actual=assertion,
-                onpass="Link discovery latency calculation successful",
-                onfail="Link discovery latency case failed")
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=assertion,
+            onpass="Link discovery latency calculation successful",
+            onfail="Link discovery latency case failed" )
 
-    def CASE5(self, main):
-        '''
+    def CASE5( self, main ):
+        """
         100 Switch discovery latency
 
         Important:
-            This test case can be potentially dangerous if 
+            This test case can be potentially dangerous if
             your machine has previously set iptables rules.
             One of the steps of the test case will flush
             all existing iptables rules.
         Note:
-            You can specify the number of switches in the 
+            You can specify the number of switches in the
             params file to adjust the switch discovery size
-            (and specify the corresponding topology in Mininet1 
-            .topo file)
-        '''
+            ( and specify the corresponding topology in Mininet1
+            .topo file )
+        """
         import time
         import subprocess
         import os
         import requests
         import json
 
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        MN1_ip = main.params['MN']['ip1']
-        ONOS_user = main.params['CTRL']['user']
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        MN1Ip = main.params[ 'MN' ][ 'ip1' ]
+        ONOSUser = main.params[ 'CTRL' ][ 'user' ]
 
-        default_sw_port = main.params['CTRL']['port1']
-       
-        #Number of iterations of case
-        num_iter = main.params['TEST']['numIter']
-        num_sw = main.params['TEST']['numSwitch']
+        defaultSwPort = main.params[ 'CTRL' ][ 'port1' ]
 
-        #Timestamp 'keys' for json metrics output.
-        #These are subject to change, hence moved into params
-        deviceTimestamp = main.params['JSON']['deviceTimestamp']
-        graphTimestamp = main.params['JSON']['graphTimestamp']
-        
-        debug_mode = main.params['TEST']['debugMode']
+        # Number of iterations of case
+        numIter = main.params[ 'TEST' ][ 'numIter' ]
+        numSw = main.params[ 'TEST' ][ 'numSwitch' ]
 
-        local_time = time.strftime('%X')
-        local_time = local_time.replace("/","")
-        local_time = local_time.replace(" ","_")
-        local_time = local_time.replace(":","")
-        if debug_mode == 'on':
-            main.ONOS1.tshark_pcap("eth0",
-                    "/tmp/100_sw_lat_pcap_"+local_time) 
- 
-        #Threshold for this test case
-        sw_disc_threshold_str = main.params['TEST']['swDisc100Threshold']
-        sw_disc_threshold_obj = sw_disc_threshold_str.split(",")
-        sw_disc_threshold_min = int(sw_disc_threshold_obj[0])
-        sw_disc_threshold_max = int(sw_disc_threshold_obj[1])
+        # Timestamp 'keys' for json metrics output.
+        # These are subject to change, hence moved into params
+        deviceTimestamp = main.params[ 'JSON' ][ 'deviceTimestamp' ]
+        graphTimestamp = main.params[ 'JSON' ][ 'graphTimestamp' ]
 
-        tshark_ofp_output = "/tmp/tshark_ofp_"+num_sw+"sw.txt"
-        tshark_tcp_output = "/tmp/tshark_tcp_"+num_sw+"sw.txt"
+        debugMode = main.params[ 'TEST' ][ 'debugMode' ]
 
-        tshark_ofp_result_list = []
-        tshark_tcp_result_list = []
+        localTime = time.strftime( '%X' )
+        localTime = localTime.replace( "/", "" )
+        localTime = localTime.replace( " ", "_" )
+        localTime = localTime.replace( ":", "" )
+        if debugMode == 'on':
+            main.ONOS1.tsharkPcap( "eth0",
+                                   "/tmp/100_sw_lat_pcap_" + localTime )
 
-        sw_discovery_lat_list = []
+        # Threshold for this test case
+        swDiscThresholdStr = main.params[ 'TEST' ][ 'swDisc100Threshold' ]
+        swDiscThresholdObj = swDiscThresholdStr.split( "," )
+        swDiscThresholdMin = int( swDiscThresholdObj[ 0 ] )
+        swDiscThresholdMax = int( swDiscThresholdObj[ 1 ] )
 
-        main.case(num_sw+" Switch discovery latency")
-        main.step("Assigning all switches to ONOS1")
-        for i in range(1, int(num_sw)+1):
-            main.Mininet1.assign_sw_controller(
-                    sw=str(i),
-                    ip1=ONOS1_ip,
-                    port1=default_sw_port)
-        
-        #Ensure that nodes are configured with ptpd
-        #Just a warning message
-        main.log.info("Please check ptpd configuration to ensure"+\
-                " All nodes' system times are in sync")
-        time.sleep(5)
+        tsharkOfpOutput = "/tmp/tshark_ofp_" + numSw + "sw.txt"
+        tsharkTcpOutput = "/tmp/tshark_tcp_" + numSw + "sw.txt"
 
-        for i in range(0, int(num_iter)):
-            
-            main.step("Set iptables rule to block incoming sw connections")
-            #Set iptables rule to block incoming switch connections
-            #The rule description is as follows:
+        tsharkOfpResultList = []
+        tsharkTcpResultList = []
+
+        swDiscoveryLatList = []
+
+        main.case( numSw + " Switch discovery latency" )
+        main.step( "Assigning all switches to ONOS1" )
+        for i in range( 1, int( numSw ) + 1 ):
+            main.Mininet1.assignSwController(
+                sw=str( i ),
+                ip1=ONOS1Ip,
+                port1=defaultSwPort )
+
+        # Ensure that nodes are configured with ptpd
+        # Just a warning message
+        main.log.info( "Please check ptpd configuration to ensure" +
+                       " All nodes' system times are in sync" )
+        time.sleep( 5 )
+
+        for i in range( 0, int( numIter ) ):
+
+            main.step( "Set iptables rule to block incoming sw connections" )
+            # Set iptables rule to block incoming switch connections
+            # The rule description is as follows:
             #   Append to INPUT rule,
             #   behavior DROP that matches following:
             #       * packet type: tcp
-            #       * source IP: MN1_ip
+            #       * source IP: MN1Ip
             #       * destination PORT: 6633
             main.ONOS1.handle.sendline(
-                    "sudo iptables -A INPUT -p tcp -s "+MN1_ip+
-                    " --dport "+default_sw_port+" -j DROP")
-            main.ONOS1.handle.expect("\$") 
-            #   Append to OUTPUT rule, 
+                "sudo iptables -A INPUT -p tcp -s " + MN1Ip +
+                " --dport " + defaultSwPort + " -j DROP" )
+            main.ONOS1.handle.expect( "\$" )
+            #   Append to OUTPUT rule,
             #   behavior DROP that matches following:
             #       * packet type: tcp
-            #       * source IP: MN1_ip
+            #       * source IP: MN1Ip
             #       * destination PORT: 6633
             main.ONOS1.handle.sendline(
-                    "sudo iptables -A OUTPUT -p tcp -s "+MN1_ip+
-                    " --dport "+default_sw_port+" -j DROP")
-            main.ONOS1.handle.expect("\$")
-            #Give time to allow rule to take effect
-            #NOTE: Sleep period may need to be configured 
+                "sudo iptables -A OUTPUT -p tcp -s " + MN1Ip +
+                " --dport " + defaultSwPort + " -j DROP" )
+            main.ONOS1.handle.expect( "\$" )
+            # Give time to allow rule to take effect
+            # NOTE: Sleep period may need to be configured
             #      based on the number of switches in the topology
-            main.log.info("Please wait for switch connection to "+
-                    "time out")
-            time.sleep(60)
-            
-            #Gather vendor OFP with tshark
-            main.ONOS1.tshark_grep("OFP 86 Vendor", 
-                    tshark_ofp_output)
-            main.ONOS1.tshark_grep("TCP 74 ",
-                    tshark_tcp_output)
+            main.log.info( "Please wait for switch connection to " +
+                           "time out" )
+            time.sleep( 60 )
 
-            #NOTE: Remove all iptables rule quickly (flush)
-            #      Before removal, obtain TestON timestamp at which 
+            # Gather vendor OFP with tshark
+            main.ONOS1.tsharkGrep( "OFP 86 Vendor",
+                                   tsharkOfpOutput )
+            main.ONOS1.tsharkGrep( "TCP 74 ",
+                                   tsharkTcpOutput )
+
+            # NOTE: Remove all iptables rule quickly ( flush )
+            #      Before removal, obtain TestON timestamp at which
             #      removal took place
-            #      (ensuring nodes are configured via ptp)
+            #      ( ensuring nodes are configured via ptp )
             #      sudo iptables -F
-            
-            t0_system = time.time() * 1000
+
+            t0System = time.time() * 1000
             main.ONOS1.handle.sendline(
-                    "sudo iptables -F")
+                "sudo iptables -F" )
 
-            #Counter to track loop count
-            counter_loop = 0
-            counter_avail1 = 0
-            counter_avail2 = 0
-            counter_avail3 = 0
-            onos1_dev = False
-            onos2_dev = False
-            onos3_dev = False
-            while counter_loop < 60:
-                #Continue to check devices for all device 
-                #availability. When all devices in all 3
-                #ONOS instances indicate that devices are available
-                #obtain graph event timestamp for t1.
-                device_str_obj1 = main.ONOS1cli.devices()
-                device_str_obj2 = main.ONOS2cli.devices()
-                device_str_obj3 = main.ONOS3cli.devices()
+            # Counter to track loop count
+            counterLoop = 0
+            counterAvail1 = 0
+            counterAvail2 = 0
+            counterAvail3 = 0
+            onos1Dev = False
+            onos2Dev = False
+            onos3Dev = False
+            while counterLoop < 60:
+                # Continue to check devices for all device
+                # availability. When all devices in all 3
+                # ONOS instances indicate that devices are available
+                # obtain graph event timestamp for t1.
+                deviceStrObj1 = main.ONOS1cli.devices()
+                deviceStrObj2 = main.ONOS2cli.devices()
+                deviceStrObj3 = main.ONOS3cli.devices()
 
-                device_json1 = json.loads(device_str_obj1)                
-                device_json2 = json.loads(device_str_obj2)                
-                device_json3 = json.loads(device_str_obj3)           
-                
-                for device1 in device_json1:
-                    if device1['available'] == True:
-                        counter_avail1 += 1
-                        if counter_avail1 == int(num_sw):
-                            onos1_dev = True
-                            main.log.info("All devices have been "+
-                                    "discovered on ONOS1")
+                deviceJson1 = json.loads( deviceStrObj1 )
+                deviceJson2 = json.loads( deviceStrObj2 )
+                deviceJson3 = json.loads( deviceStrObj3 )
+
+                for device1 in deviceJson1:
+                    if device1[ 'available' ]:
+                        counterAvail1 += 1
+                        if counterAvail1 == int( numSw ):
+                            onos1Dev = True
+                            main.log.info( "All devices have been " +
+                                           "discovered on ONOS1" )
                     else:
-                        counter_avail1 = 0
-                for device2 in device_json2:
-                    if device2['available'] == True:
-                        counter_avail2 += 1
-                        if counter_avail2 == int(num_sw):
-                            onos2_dev = True
-                            main.log.info("All devices have been "+
-                                    "discovered on ONOS2")
+                        counterAvail1 = 0
+                for device2 in deviceJson2:
+                    if device2[ 'available' ]:
+                        counterAvail2 += 1
+                        if counterAvail2 == int( numSw ):
+                            onos2Dev = True
+                            main.log.info( "All devices have been " +
+                                           "discovered on ONOS2" )
                     else:
-                        counter_avail2 = 0
-                for device3 in device_json3:
-                    if device3['available'] == True:
-                        counter_avail3 += 1
-                        if counter_avail3 == int(num_sw):
-                            onos3_dev = True
-                            main.log.info("All devices have been "+
-                                    "discovered on ONOS3")
+                        counterAvail2 = 0
+                for device3 in deviceJson3:
+                    if device3[ 'available' ]:
+                        counterAvail3 += 1
+                        if counterAvail3 == int( numSw ):
+                            onos3Dev = True
+                            main.log.info( "All devices have been " +
+                                           "discovered on ONOS3" )
                     else:
-                        counter_avail3 = 0
+                        counterAvail3 = 0
 
-                if onos1_dev and onos2_dev and onos3_dev:
-                    main.log.info("All devices have been discovered "+
-                            "on all ONOS instances")
-                    json_str_topology_metrics_1 =\
-                        main.ONOS1cli.topology_events_metrics()
-                    json_str_topology_metrics_2 =\
-                        main.ONOS2cli.topology_events_metrics()
-                    json_str_topology_metrics_3 =\
-                        main.ONOS3cli.topology_events_metrics()
-                   
-                    #Exit while loop if all devices discovered
-                    break 
-                
-                counter_loop += 1
-                #Give some time in between CLI calls
-                #(will not affect measurement)
-                time.sleep(3)
+                if onos1Dev and onos2Dev and onos3Dev:
+                    main.log.info( "All devices have been discovered " +
+                                   "on all ONOS instances" )
+                    jsonStrTopologyMetrics1 =\
+                        main.ONOS1cli.topologyEventsMetrics()
+                    jsonStrTopologyMetrics2 =\
+                        main.ONOS2cli.topologyEventsMetrics()
+                    jsonStrTopologyMetrics3 =\
+                        main.ONOS3cli.topologyEventsMetrics()
 
-            main.ONOS1.tshark_stop()
-            
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_ofp_output+" /tmp/") 
-            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
-                    tshark_tcp_output+" /tmp/")
+                    # Exit while loop if all devices discovered
+                    break
 
-            #TODO: Automate OFP output analysis
-            #Debug mode - print out packets captured at runtime     
-            if debug_mode == 'on': 
-                ofp_file = open(tshark_ofp_output, 'r')
-                main.log.info("Tshark OFP Vendor output: ")
-                for line in ofp_file:
-                    tshark_ofp_result_list.append(line)
-                    main.log.info(line)
-                ofp_file.close()
+                counterLoop += 1
+                # Give some time in between CLI calls
+                #( will not affect measurement )
+                time.sleep( 3 )
 
-                tcp_file = open(tshark_tcp_output, 'r')
-                main.log.info("Tshark TCP 74 output: ")
-                for line in tcp_file:
-                    tshark_tcp_result_list.append(line)
-                    main.log.info(line)
-                tcp_file.close()
+            main.ONOS1.tsharkStop()
 
-            json_obj_1 = json.loads(json_str_topology_metrics_1)
-            json_obj_2 = json.loads(json_str_topology_metrics_2)
-            json_obj_3 = json.loads(json_str_topology_metrics_3)
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkOfpOutput + " /tmp/" )
+            os.system( "scp " + ONOSUser + "@" + ONOS1Ip + ":" +
+                       tsharkTcpOutput + " /tmp/" )
 
-            graph_timestamp_1 = \
-                    json_obj_1[graphTimestamp]['value']
-            graph_timestamp_2 = \
-                    json_obj_2[graphTimestamp]['value']
-            graph_timestamp_3 = \
-                    json_obj_3[graphTimestamp]['value']
+            # TODO: Automate OFP output analysis
+            # Debug mode - print out packets captured at runtime
+            if debugMode == 'on':
+                ofpFile = open( tsharkOfpOutput, 'r' )
+                main.log.info( "Tshark OFP Vendor output: " )
+                for line in ofpFile:
+                    tsharkOfpResultList.append( line )
+                    main.log.info( line )
+                ofpFile.close()
 
-            graph_lat_1 = int(graph_timestamp_1) - int(t0_system)
-            graph_lat_2 = int(graph_timestamp_2) - int(t0_system)
-            graph_lat_3 = int(graph_timestamp_3) - int(t0_system)
+                tcpFile = open( tsharkTcpOutput, 'r' )
+                main.log.info( "Tshark TCP 74 output: " )
+                for line in tcpFile:
+                    tsharkTcpResultList.append( line )
+                    main.log.info( line )
+                tcpFile.close()
 
-            avg_graph_lat = \
-                    (int(graph_lat_1) +\
-                     int(graph_lat_2) +\
-                     int(graph_lat_3)) / 3
-    
-            if avg_graph_lat > sw_disc_threshold_min \
-                    and avg_graph_lat < sw_disc_threshold_max:
-                sw_discovery_lat_list.append(
-                        avg_graph_lat)
+            jsonObj1 = json.loads( jsonStrTopologyMetrics1 )
+            jsonObj2 = json.loads( jsonStrTopologyMetrics2 )
+            jsonObj3 = json.loads( jsonStrTopologyMetrics3 )
+
+            graphTimestamp1 = \
+                jsonObj1[ graphTimestamp ][ 'value' ]
+            graphTimestamp2 = \
+                jsonObj2[ graphTimestamp ][ 'value' ]
+            graphTimestamp3 = \
+                jsonObj3[ graphTimestamp ][ 'value' ]
+
+            graphLat1 = int( graphTimestamp1 ) - int( t0System )
+            graphLat2 = int( graphTimestamp2 ) - int( t0System )
+            graphLat3 = int( graphTimestamp3 ) - int( t0System )
+
+            avgGraphLat = \
+                ( int( graphLat1 ) +
+                  int( graphLat2 ) +
+                  int( graphLat3 ) ) / 3
+
+            if avgGraphLat > swDiscThresholdMin \
+                    and avgGraphLat < swDiscThresholdMax:
+                swDiscoveryLatList.append(
+                    avgGraphLat )
             else:
-                main.log.info("100 Switch discovery latency "+
-                        "exceeded the threshold.")
-            
-            #END ITERATION FOR LOOP
+                main.log.info( "100 Switch discovery latency " +
+                               "exceeded the threshold." )
 
-        sw_lat_min = min(sw_discovery_lat_list)
-        sw_lat_max = max(sw_discovery_lat_list)
-        sw_lat_avg = sum(sw_discovery_lat_list) /\
-                     len(sw_discovery_lat_list)
+            # END ITERATION FOR LOOP
 
-        main.log.report("100 Switch discovery lat "+\
-                "Min: "+str(sw_lat_min)+" ms"+\
-                "Max: "+str(sw_lat_max)+" ms"+\
-                "Avg: "+str(sw_lat_avg)+" ms")
+        swLatMin = min( swDiscoveryLatList )
+        swLatMax = max( swDiscoveryLatList )
+        swLatAvg = sum( swDiscoveryLatList ) /\
+            len( swDiscoveryLatList )
 
-    def CASE6(self, main):
-        '''
+        main.log.report( "100 Switch discovery lat " +
+                         "Min: " + str( swLatMin ) + " ms" +
+                         "Max: " + str( swLatMax ) + " ms" +
+                         "Avg: " + str( swLatAvg ) + " ms" )
+
+    def CASE6( self, main ):
+        """
         Increase number of nodes and initiate CLI
-        '''
+        """
         import time
-        
-        ONOS1_ip = main.params['CTRL']['ip1']
-        ONOS2_ip = main.params['CTRL']['ip2']
-        ONOS3_ip = main.params['CTRL']['ip3']
-        ONOS4_ip = main.params['CTRL']['ip4']
-        ONOS5_ip = main.params['CTRL']['ip5']
-        ONOS6_ip = main.params['CTRL']['ip6']
-        ONOS7_ip = main.params['CTRL']['ip7']
 
-        cell_name = main.params['ENV']['cellName']
-    
-        global cluster_count
-        
-        #Cluster size increased everytime the case is defined
-        cluster_count += 2 
+        ONOS1Ip = main.params[ 'CTRL' ][ 'ip1' ]
+        ONOS2Ip = main.params[ 'CTRL' ][ 'ip2' ]
+        ONOS3Ip = main.params[ 'CTRL' ][ 'ip3' ]
+        ONOS4Ip = main.params[ 'CTRL' ][ 'ip4' ]
+        ONOS5Ip = main.params[ 'CTRL' ][ 'ip5' ]
+        ONOS6Ip = main.params[ 'CTRL' ][ 'ip6' ]
+        ONOS7Ip = main.params[ 'CTRL' ][ 'ip7' ]
 
-        main.log.report("Increasing cluster size to "+
-                str(cluster_count))
+        cellName = main.params[ 'ENV' ][ 'cellName' ]
 
-        install_result = main.FALSE
-        if cluster_count == 3:
-            main.log.info("Installing nodes 2 and 3")
-            node2_result = \
-                main.ONOSbench.onos_install(node=ONOS2_ip)
-            node3_result = \
-                main.ONOSbench.onos_install(node=ONOS3_ip)
-            install_result = node2_result and node3_result
-            
-            time.sleep(5)
+        global clusterCount
 
-            main.ONOS2cli.start_onos_cli(ONOS2_ip)
-            main.ONOS3cli.start_onos_cli(ONOS3_ip)
+        # Cluster size increased everytime the case is defined
+        clusterCount += 2
 
-        elif cluster_count == 5:
-            main.log.info("Installing nodes 4 and 5")
-            node4_result = \
-                main.ONOSbench.onos_install(node=ONOS4_ip)
-            node5_result = \
-                main.ONOSbench.onos_install(node=ONOS5_ip)
-            install_result = node4_result and node5_result
+        main.log.report( "Increasing cluster size to " +
+                         str( clusterCount ) )
 
-            time.sleep(5)
+        installResult = main.FALSE
+        if clusterCount == 3:
+            main.log.info( "Installing nodes 2 and 3" )
+            node2Result = \
+                main.ONOSbench.onosInstall( node=ONOS2Ip )
+            node3Result = \
+                main.ONOSbench.onosInstall( node=ONOS3Ip )
+            installResult = node2Result and node3Result
 
-            main.ONOS4cli.start_onos_cli(ONOS4_ip)
-            main.ONOS5cli.start_onos_cli(ONOS5_ip)
+            time.sleep( 5 )
 
-        elif cluster_count == 7:
-            main.log.info("Installing nodes 4 and 5")
-            node6_result = \
-                main.ONOSbench.onos_install(node=ONOS6_ip)
-            node7_result = \
-                main.ONOSbench.onos_install(node=ONOS7_ip)
-            install_result = node6_result and node7_result
+            main.ONOS2cli.startOnosCli( ONOS2Ip )
+            main.ONOS3cli.startOnosCli( ONOS3Ip )
 
-            time.sleep(5)
+        elif clusterCount == 5:
+            main.log.info( "Installing nodes 4 and 5" )
+            node4Result = \
+                main.ONOSbench.onosInstall( node=ONOS4Ip )
+            node5Result = \
+                main.ONOSbench.onosInstall( node=ONOS5Ip )
+            installResult = node4Result and node5Result
 
-            main.ONOS6cli.start_onos_cli(ONOS6_ip)
-            main.ONOS7cli.start_onos_cli(ONOS7_ip)
+            time.sleep( 5 )
 
+            main.ONOS4cli.startOnosCli( ONOS4Ip )
+            main.ONOS5cli.startOnosCli( ONOS5Ip )
 
+        elif clusterCount == 7:
+            main.log.info( "Installing nodes 4 and 5" )
+            node6Result = \
+                main.ONOSbench.onosInstall( node=ONOS6Ip )
+            node7Result = \
+                main.ONOSbench.onosInstall( node=ONOS7Ip )
+            installResult = node6Result and node7Result
 
+            time.sleep( 5 )
+
+            main.ONOS6cli.startOnosCli( ONOS6Ip )
+            main.ONOS7cli.startOnosCli( ONOS7Ip )