diff --git a/TestON/tests/TopoPerfNextSingleNode/TopoPerfNextSingleNode.py b/TestON/tests/TopoPerfNextSingleNode/TopoPerfNextSingleNode.py
new file mode 100644
index 0000000..d10c0ee
--- /dev/null
+++ b/TestON/tests/TopoPerfNextSingleNode/TopoPerfNextSingleNode.py
@@ -0,0 +1,1108 @@
+#TopoPerfNext
+#
+#Topology Performance test for ONOS-next
+#*** Revised for single node operation ***
+#
+#andrew@onlab.us
+
+import time
+import sys
+import os
+import re
+
+class TopoPerfNextSingleNode:
+    def __init__(self):
+        self.default = ''
+
+    def CASE1(self, main):
+        '''
+        ONOS startup sequence
+        '''
+        import time
+    
+        cell_name = main.params['ENV']['cellName']
+
+        git_pull = main.params['GIT']['autoPull']
+        checkout_branch = main.params['GIT']['checkout']
+
+        ONOS1_ip = main.params['CTRL']['ip1']
+        MN1_ip = main.params['MN']['ip1']
+        BENCH_ip = main.params['BENCH']['ip']
+
+        main.case("Setting up test environment")
+
+        main.step("Creating cell file")
+        cell_file_result = main.ONOSbench.create_cell_file(
+                BENCH_ip, cell_name, MN1_ip, "onos-core",
+                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()
+        
+        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()
+        else:
+            checkout_result = main.TRUE
+            pull_result = main.TRUE
+            main.log.info("Skipped git checkout and pull")
+
+        main.step("Using mvn clean & install")
+        #mvn_result = main.ONOSbench.clean_install()
+        mvn_result = main.TRUE
+
+        main.step("Creating ONOS package")
+        package_result = main.ONOSbench.onos_package()
+
+        main.step("Installing ONOS package")
+        install1_result = main.ONOSbench.onos_install(node=ONOS1_ip)
+
+        #NOTE: This step may be unnecessary
+        #main.step("Starting ONOS service")
+        #start_result = main.ONOSbench.onos_start(ONOS1_ip)
+
+        main.step("Set cell for ONOS cli env")
+        main.ONOS1cli.set_cell(cell_name)
+
+        time.sleep(10)
+
+        main.step("Start onos cli")
+        cli1 = main.ONOS1cli.start_onos_cli(ONOS1_ip)
+
+        main.step("Enable metrics feature")
+        main.ONOS1cli.feature_install("onos-app-metrics")
+
+        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, 
+                onpass="ONOS started successfully",
+                onfail="Failed to start ONOS")
+
+    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
+           measurement from OFP Vendor message to Graph change
+        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)
+        '''
+        import time
+        import subprocess
+        import json
+        import requests
+        import os
+
+        ONOS1_ip = main.params['CTRL']['ip1']
+        ONOS_user = main.params['CTRL']['user']
+
+        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']
+        graphTimestamp = main.params['JSON']['graphTimestamp']
+
+        #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 = []
+
+        #Directory/file to store tshark results
+        tshark_of_output = "/tmp/tshark_of_topo.txt"
+        tshark_tcp_output = "/tmp/tshark_tcp_topo.txt"
+
+        #String to grep in tshark output
+        tshark_tcp_string = "TCP 74 "+default_sw_port
+        tshark_of_string = "OFP 86 Vendor"
+     
+        #Initialize assertion to TRUE
+        assertion = main.TRUE
+        
+        main.log.report("Latency of adding one switch")
+
+        for i in range(0, int(num_iter)):
+            main.log.info("Starting tshark capture")
+
+            #* TCP [ACK, SYN] is used as t0_a, the
+            #  very first "exchange" between ONOS and 
+            #  the switch for end-to-end measurement
+            #* OFP [Stats Reply] is used for t0_b
+            #  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)
+
+            #Wait and ensure tshark is started and 
+            #capturing
+            time.sleep(10)
+
+            main.log.info("Assigning s1 to controller")
+
+            main.Mininet1.assign_sw_controller(sw="1",
+                    ip1=ONOS1_ip, port1=default_sw_port)
+
+            #Wait and ensure switch is assigned
+            #before stopping tshark
+            time.sleep(30)
+   
+            main.log.info("Stopping all Tshark processes")
+            main.ONOS1.stop_tshark()
+
+            #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("Object read in from TCP capture: "+
+                    str(temp_text))
+            if len(temp_text) > 1:
+                t0_tcp = float(temp_text[1])*1000.0
+            else:
+                main.log.error("Tshark output file for TCP"+
+                        " returned unexpected results")
+                t0_tcp = 0
+                assertion = main.FALSE
+            
+            tcp_file.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
+            while True:
+                temp_text = of_file.readline()
+                if temp_text !='':
+                    line_ofp = temp_text
+                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
+            else:
+                main.log.error("Tshark output file for OFP"+
+                        " returned unexpected results")
+                t0_ofp = 0
+                assertion = main.FALSE
+            
+            of_file.close()
+            #****************
+           
+            json_str_1 = main.ONOS1cli.topology_events_metrics()
+
+            json_obj_1 = json.loads(json_str_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'] 
+            
+            #t0 to device processing latency 
+            delta_device_1 = int(device_timestamp_1) - int(t0_tcp)
+        
+            #Get average of delta from all instances
+            avg_delta_device = (int(delta_device_1))
+
+            #Ensure avg delta meets the threshold before appending
+            if avg_delta_device > 0.0 and avg_delta_device < 10000:
+                latency_t0_to_device_list.append(avg_delta_device)
+            else:
+                main.log.info("Results for t0-to-device ignored"+\
+                        "due to excess in threshold")
+
+            #t0 to graph processing latency (end-to-end)
+            delta_graph_1 = int(graph_timestamp_1) - int(t0_tcp)
+        
+            #Get average of delta from all instances
+            avg_delta_graph = int(delta_graph_1)
+
+            #Ensure avg delta meets the threshold before appending
+            if avg_delta_graph > 0.0 and avg_delta_graph < 10000:
+                latency_end_to_end_list.append(avg_delta_graph)
+            else:
+                main.log.info("Results for end-to-end ignored"+\
+                        "due to excess in threshold")
+
+            #ofp to graph processing latency (ONOS processing)
+            delta_ofp_graph_1 = int(graph_timestamp_1) - int(t0_ofp)
+            
+            avg_delta_ofp_graph = int(delta_ofp_graph_1)
+            
+            if avg_delta_ofp_graph > 0.0 and avg_delta_ofp_graph < 10000:
+                latency_ofp_to_graph_list.append(avg_delta_ofp_graph)
+            else:
+                main.log.info("Results for ofp-to-graph "+\
+                        "ignored due to excess in threshold")
+
+            #ofp to device processing latency (ONOS processing)
+            delta_ofp_device_1 = float(device_timestamp_1) - float(t0_ofp)
+            
+            avg_delta_ofp_device = float(delta_ofp_device_1)
+            
+            #NOTE: ofp - delta measurements are occasionally negative
+            #      due to system time misalignment.
+            latency_ofp_to_device_list.append(avg_delta_ofp_device)
+
+            #TODO:
+            #Fetch logs upon threshold excess
+
+            main.log.info("ONOS1 delta end-to-end: "+
+                    str(delta_graph_1) + " 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.step("Remove switch from controller")
+            main.Mininet1.delete_sw_controller("s1")
+
+            time.sleep(5)
+
+        #END of for loop iteration
+
+        #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:
+            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)
+            assertion = main.FALSE
+        elif len(latency_ofp_to_graph_list) == 0:
+            latency_ofp_to_graph_list.append(0)
+            assertion = main.FALSE
+        elif len(latency_ofp_to_device_list) == 0:
+            latency_ofp_to_device_list.append(0)
+            assertion = main.FALSE
+        elif len(latency_t0_to_device_list) == 0:
+            latency_t0_to_device_list.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_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_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_t0_to_device_max = \
+                float(max(latency_t0_to_device_list))
+        latency_t0_to_device_min = \
+                float(min(latency_t0_to_device_list))
+        latency_t0_to_device_avg = \
+                (float(sum(latency_t0_to_device_list)) / \
+                 len(latency_ofp_to_device_list))
+
+        main.log.report("Switch add - End-to-end latency: \n"+\
+                "Min: "+str(latency_end_to_end_min)+"\n"+\
+                "Max: "+str(latency_end_to_end_max)+"\n"+\
+                "Avg: "+str(latency_end_to_end_avg))
+        main.log.report("Switch add - OFP-to-Graph latency: \n"+\
+                "Min: "+str(latency_ofp_to_graph_min)+"\n"+\
+                "Max: "+str(latency_ofp_to_graph_max)+"\n"+\
+                "Avg: "+str(latency_ofp_to_graph_avg))
+        main.log.report("Switch add - t0-to-Device latency: \n"+\
+                "Min: "+str(latency_t0_to_device_min)+"\n"+\
+                "Max: "+str(latency_t0_to_device_max)+"\n"+\
+                "Avg: "+str(latency_t0_to_device_avg))
+
+        utilities.assert_equals(expect=main.TRUE, actual=assertion,
+                onpass="Switch latency test successful",
+                onfail="Switch latency test failed")
+
+    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 
+        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
+
+        ONOS1_ip = main.params['CTRL']['ip1']
+        ONOS_user = main.params['CTRL']['user']
+
+        default_sw_port = 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']
+
+        #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"
+
+        main.log.report("Port enable / disable latency")
+
+        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)
+
+        #Give enough time for metrics to propagate the 
+        #assign controller event. Otherwise, these events may
+        #carry over to our measurements
+        time.sleep(10)
+
+        main.step("Verify switch is assigned correctly")
+        result_s1 = main.Mininet1.get_sw_controller(sw="s1")
+        result_s2 = main.Mininet1.get_sw_controller(sw="s2")
+        if result_s1 == main.FALSE or result_s2 == main.FALSE:
+            main.log.info("Switch s1 was not assigned correctly")
+            assertion = main.FALSE
+        else:
+            main.log.info("Switch s1 was assigned correctly")
+
+        port_up_device_to_ofp_list = []
+        port_up_graph_to_ofp_list = []
+        port_down_device_to_ofp_list = []
+        port_down_graph_to_ofp_list = []
+
+        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(10)
+
+            #Disable interface that is connected to switch 2
+            main.step("Disable port: "+interface_config)
+            main.Mininet2.handle.sendline("sudo ifconfig "+
+                    interface_config+" down")
+            main.Mininet2.handle.expect("\$")
+            time.sleep(10)
+
+            main.ONOS1.tshark_stop()
+            time.sleep(5)
+            
+            #Copy tshark output file from ONOS to TestON instance
+            #/tmp directory
+            os.system("scp "+ONOS_user+"@"+ONOS1_ip+":"+
+                    tshark_port_down+" /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:
+                timestamp_begin_pt_down = int(float(obj_down[1]))*1000
+                main.log.info("Port down begin timestamp: "+
+                        str(timestamp_begin_pt_down))
+            else:
+                main.log.info("Tshark output file returned unexpected"+
+                        " results: "+str(obj_down))
+                timestamp_begin_pt_down = 0
+            
+            f_port_down.close()
+
+            main.log.info("TEST tshark obj: "+str(obj_down))
+
+            main.step("Obtain t1 by REST call")
+            json_str_1 = main.ONOS1cli.topology_events_metrics()
+
+            main.log.info("TEST json_str 1: "+str(json_str_1))
+
+            json_obj_1 = json.loads(json_str_1)
+           
+            time.sleep(5)
+
+            #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)
+       
+            #Caluclate average across clusters
+            pt_down_graph_to_ofp_avg = int(pt_down_graph_to_ofp_1)
+            pt_down_device_to_ofp_avg = int(pt_down_device_to_ofp_1) 
+
+            if pt_down_graph_to_ofp_avg > 0.0 and \
+                    pt_down_graph_to_ofp_avg < 1000:
+                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")
+            else:
+                main.log.info("Average port down graph-to-ofp result" +
+                        " exceeded the threshold: "+
+                        str(pt_down_graph_to_ofp_avg))
+
+            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")
+            else:
+                main.log.info("Average port down device-to-ofp result" +
+                        " exceeded the threshold: "+
+                        str(pt_down_device_to_ofp_avg))
+
+            #Port up events 
+            main.step("Enable port and obtain timestamp")
+            main.step("Starting wireshark capture for port status up")
+            main.ONOS1.tshark_grep("OFP 130 Port Status", tshark_port_up)
+            time.sleep(5)
+
+            main.Mininet2.handle.sendline("sudo ifconfig "+
+                    interface_config+" up")
+            main.Mininet2.handle.expect("\$")
+            time.sleep(10)
+            
+            main.ONOS1.tshark_stop()
+
+            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
+                main.log.info("Port up begin timestamp: "+
+                        str(timestamp_begin_pt_up))
+            else:
+                main.log.info("Tshark output file returned unexpected"+
+                        " results.")
+                timestamp_begin_pt_up = 0
+            
+            f_port_up.close()
+
+            main.step("Obtain t1 by REST call")
+            json_str_1 = main.ONOS1cli.topology_events_metrics()
+
+            json_obj_1 = json.loads(json_str_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_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)
+
+            pt_up_graph_to_ofp_avg = float(pt_up_graph_to_ofp_1) 
+
+            pt_up_device_to_ofp_avg = float(pt_up_device_to_ofp_1) 
+
+            if pt_up_graph_to_ofp_avg > 0 and \
+                    pt_up_graph_to_ofp_avg < 1000:
+                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")
+            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 > 0 and \
+                    pt_up_device_to_ofp_avg < 1000:
+                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")
+            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):
+            assertion = main.TRUE
+
+        #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))
+        
+        main.log.report("Port down graph-to-ofp Min: "+
+                str(port_down_graph_to_ofp_min)+" ms  Max: "+
+                str(port_down_graph_to_ofp_max)+" ms  Avg: "+
+                str(port_down_graph_to_ofp_avg))
+        
+        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))
+        
+        main.log.report("Port down device-to-ofp Min: "+
+                str(port_down_device_to_ofp_min)+" ms  Max: "+
+                str(port_down_device_to_ofp_max)+" ms  Avg: "+
+                str(port_down_device_to_ofp_avg))
+        
+        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))
+        
+        main.log.report("Port up graph-to-ofp Min: "+
+                str(port_up_graph_to_ofp_min)+" ms  Max: "+
+                str(port_up_graph_to_ofp_max)+" ms  Avg: "+
+                str(port_up_graph_to_ofp_avg))
+          
+        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))
+        
+        main.log.report("Port up device-to-ofp Min: "+
+                str(port_up_device_to_ofp_min)+" ms  Max: "+
+                str(port_up_device_to_ofp_max)+" ms  Avg: "+
+                str(port_up_device_to_ofp_avg))
+
+        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 
+            switches are 1 / 2 respectively
+        '''
+        import time
+        import subprocess
+        import os
+        import requests
+        import json
+
+        ONOS1_ip = main.params['CTRL']['ip1']
+        ONOS_user = main.params['CTRL']['user']
+
+        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']
+
+        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 = [] 
+
+        main.log.report("Add / remove link latency between "+
+                "two switches")
+
+        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("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)
+
+        link_down = False
+        #Start iteration of link event test
+        for i in range(0, int(num_iter)):
+            main.step("Getting initial system time as t0")
+            
+            timestamp_link_down_t0 = 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%")
+
+            #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_down and loop_count < 30 ):
+                json_str = main.ONOS1cli.links()
+                
+                if not json_str:
+                    main.log.error("CLI command returned error ")
+                    break
+                else:
+                    json_obj = json.loads(json_str)
+                for obj in json_obj:
+                    if '01' not in obj['src']['device']:
+                        link_down = True
+                        main.log.report("Link down from "+
+                                "s1 -> s2 on ONOS1 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_down:
+                main.log.info("Link down discovery failed")
+                
+                link_down_lat_graph1 = 0
+                link_down_lat_device1 = 0
+                assertion = main.FALSE
+            else:
+                json_topo_metrics_1 =\
+                        main.ONOS1cli.topology_events_metrics()
+                json_topo_metrics_1 = json.loads(json_topo_metrics_1)
+                
+                main.log.info("Obtaining graph and device timestamp")
+                graph_timestamp_1 = \
+                    json_topo_metrics_1[graphTimestamp]['value']
+
+                link_timestamp_1 = \
+                    json_topo_metrics_1[linkTimestamp]['value']
+
+                if graph_timestamp_1 and link_timestamp_1:
+                    link_down_lat_graph1 = int(graph_timestamp_1) -\
+                            timestamp_link_down_t0
+                
+                    link_down_lat_link1 = int(link_timestamp_1) -\
+                            timestamp_link_down_t0
+                else:
+                    main.log.error("There was an error calculating"+
+                        " the delta for link down event")
+                    link_down_lat_graph1 = 0
+                    
+                    link_down_lat_device1 = 0
+        
+            main.log.report("Link down latency ONOS1 iteration "+
+                    str(i)+" (end-to-end): "+
+                    str(link_down_lat_graph1)+" ms")
+            
+            main.log.report("Link down latency ONOS1 iteration "+
+                    str(i)+" (link-event-to-system-timestamp): "+
+                    str(link_down_lat_link1)+" ms")
+      
+            #Calculate avg of node calculations
+            link_down_lat_graph_avg = link_down_lat_graph1
+            link_down_lat_link_avg = link_down_lat_link1
+
+            #Set threshold and append latency to list
+            if link_down_lat_graph_avg > 0.0 and\
+               link_down_lat_graph_avg < 30000:
+                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 > 0.0 and\
+               link_down_lat_link_avg < 30000:
+                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")
+
+            #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
+            loop_count = 0
+            while( link_down1 and loop_count < 30 ):
+                json_str1 = main.ONOS1cli.links()
+                if not json_str1:
+                    main.log.error("CLI command returned error ")
+                    break
+                else:
+                    json_obj1 = json.loads(json_str1)
+                
+                for obj1 in json_obj1:
+                    if '01' in obj1['src']['device']:
+                        link_down1 = False 
+                        main.log.report("Link up from "+
+                            "s1 -> s2 on ONOS1 detected")
+                loop_count += 1
+                time.sleep(1)
+            
+            if link_down1:
+                main.log.info("Link up discovery failed")
+                link_up_lat_graph1 = 0
+                link_up_lat_device1 = 0
+                assertion = main.FALSE
+            else:
+                json_topo_metrics_1 =\
+                        main.ONOS1cli.topology_events_metrics()
+                json_topo_metrics_1 = json.loads(json_topo_metrics_1)
+
+                main.log.info("Obtaining graph and device timestamp")
+                graph_timestamp_1 = \
+                    json_topo_metrics_1[graphTimestamp]['value']
+                
+                link_timestamp_1 = \
+                    json_topo_metrics_1[linkTimestamp]['value']
+
+                if graph_timestamp_1 and link_timestamp_1:
+                    link_up_lat_graph1 = int(graph_timestamp_1) -\
+                            timestamp_link_up_t0
+                    link_up_lat_link1 = int(link_timestamp_1) -\
+                            timestamp_link_up_t0
+                else:
+                    main.log.error("There was an error calculating"+
+                        " the delta for link down event")
+                    link_up_lat_graph1 = 0
+                    link_up_lat_device1 = 0
+        
+            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 ONOS1 iteration "+
+                    str(i)+" (link-event-to-system-timestamp): "+
+                    str(link_up_lat_link1)+" ms")
+      
+            #Calculate avg of node calculations
+            link_up_lat_graph_avg = link_up_lat_graph1
+            link_up_lat_link_avg = link_up_lat_link1
+
+            #Set threshold and append latency to list
+            if link_up_lat_graph_avg > 0.0 and\
+               link_up_lat_graph_avg < 30000:
+                link_up_graph_to_system_list.append(
+                        link_up_lat_graph_avg)
+            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 > 0.0 and\
+               link_up_lat_link_avg < 30000:
+                link_up_link_to_system_list.append(
+                        link_up_lat_link_avg)
+            else:
+                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)
+
+        main.log.report("Link down latency - Min: "+
+                str(link_down_min)+"ms  Max: "+
+                str(link_down_max)+"ms  Avg: "+
+                str(link_down_avg)+"ms")
+        main.log.report("Link up latency - Min: "+
+                str(link_up_min)+"ms  Max: "+
+                str(link_up_max)+"ms  Avg: "+
+                str(link_up_avg)+"ms")
+
+        utilities.assert_equals(expect=main.TRUE, actual=assertion,
+                onpass="Link discovery latency calculation successful",
+                onfail="Link discovery latency case failed")
+
+    def CASE5(self, main):
+        '''
+        100 Switch discovery latency
+
+        Important:
+            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 
+            params file to adjust the switch discovery size
+            (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']
+        MN1_ip = main.params['MN']['ip1']
+        ONOS_user = 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']
+
+        #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"
+
+        tshark_ofp_result_list = []
+        tshark_tcp_result_list = []
+
+        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)
+
+        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:
+            #   Append to INPUT rule,
+            #   behavior DROP that matches following:
+            #       * packet type: tcp
+            #       * source IP: MN1_ip
+            #       * 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, 
+            #   behavior DROP that matches following:
+            #       * packet type: tcp
+            #       * source IP: MN1_ip
+            #       * 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 
+            #      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)
+
+            #NOTE: Remove all iptables rule quickly (flush)
+            #      Before removal, obtain TestON timestamp at which 
+            #      removal took place
+            #      (ensuring nodes are configured via ptp)
+            #      sudo iptables -F
+            
+            t0_system = time.time() * 1000
+            main.ONOS1.handle.sendline(
+                    "sudo iptables -F")
+
+            #Counter to track loop count
+            counter_loop = 0
+            counter_avail1 = 0
+            onos1_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_json1 = json.loads(device_str_obj1)                
+                
+                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")
+                    else:
+                        counter_avail1 = 0
+
+                if onos1_dev: 
+                    main.log.info("All devices have been discovered "+
+                            "on all ONOS instances")
+                    json_str_topology_metrics_1 =\
+                        main.ONOS1cli.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)
+
+            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/")
+            ofp_file = open(tshark_ofp_output, 'r')
+
+            #The following is for information purpose only.
+            #TODO: Automate OFP output analysis
+            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()
+
+            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()
+
+            json_obj_1 = json.loads(json_str_topology_metrics_1)
+
+            graph_timestamp_1 = \
+                    json_obj_1[graphTimestamp]['value']
+
+            main.log.info(
+                    int(graph_timestamp_1) - int(t0_system))
+
+
+
+
+
+
+