diff --git a/TestON/drivers/common/api/controller/onosrestdriver.py b/TestON/drivers/common/api/controller/onosrestdriver.py
index 033353b..979b0b6 100755
--- a/TestON/drivers/common/api/controller/onosrestdriver.py
+++ b/TestON/drivers/common/api/controller/onosrestdriver.py
@@ -1031,7 +1031,7 @@
             main.cleanup()
             main.exit()
 
-    def flows( self, ip="DEFAULT", port="DEFAULT" ):
+    def flows( self, ip="DEFAULT", port="DEFAULT", subjectClass=None, subjectKey=None ):
         """
         Description:
             Get flows currently added to the system
@@ -1043,6 +1043,7 @@
         """
         try:
             output = None
+            url = "/flows"
             if ip == "DEFAULT":
                 main.log.warn( "No ip given, reverting to ip from topo file" )
                 ip = self.ip_address
@@ -1050,7 +1051,13 @@
                 main.log.warn( "No port given, reverting to port " +
                                "from topo file" )
                 port = self.port
-            response = self.send( url="/flows", ip = ip, port = port )
+            if subjectKey and not subjectClass:
+                main.log.warning( "Subject Key provided without Subject Class.  Ignoring Subject Key" )
+            if subjectClass:
+                url += "/" + subjectClass
+                if subjectKey:
+                    url += "/" + subjectKey
+            response = self.send( url=url, ip=ip, port=port )
             if response:
                 if 200 <= response[ 0 ] <= 299:
                     output = response[ 1 ]
diff --git a/TestON/drivers/common/cli/onosclidriver.py b/TestON/drivers/common/cli/onosclidriver.py
index 31b02aa..306680e 100755
--- a/TestON/drivers/common/cli/onosclidriver.py
+++ b/TestON/drivers/common/cli/onosclidriver.py
@@ -2301,10 +2301,11 @@
             main.log.error( self.name + ": ONOS timeout" )
             return None
 
-    def flows( self, state="", jsonFormat=True, timeout=60, noExit=False ):
+    def flows( self, state="", jsonFormat=True, timeout=60, noExit=False, noCore=False ):
         """
         Optional:
             * jsonFormat: enable output formatting in json
+            * noCore: suppress core flows
         Description:
             Obtain flows currently installed
         """
@@ -2312,6 +2313,8 @@
             cmdStr = "flows"
             if jsonFormat:
                 cmdStr += " -j "
+            if noCore:
+                cmdStr += " -n "
             cmdStr += state
             handle = self.sendline( cmdStr, timeout=timeout, noExit=noExit )
             assert "Command not found:" not in handle, handle
diff --git a/TestON/tests/FUNC/FUNCintent/FUNCintent.params b/TestON/tests/FUNC/FUNCintent/FUNCintent.params
index c201411..7af98ee 100644
--- a/TestON/tests/FUNC/FUNCintent/FUNCintent.params
+++ b/TestON/tests/FUNC/FUNCintent/FUNCintent.params
@@ -50,6 +50,7 @@
         <checkintent>5</checkintent>
         <fwd>10</fwd>
         <topoAttempts>3</topoAttempts>
+        <flowDuration>10</flowDuration>
     </SLEEP>
 
     <MININET>
diff --git a/TestON/tests/FUNC/FUNCintent/FUNCintent.py b/TestON/tests/FUNC/FUNCintent/FUNCintent.py
index 22fcf3c..5ee3f70 100644
--- a/TestON/tests/FUNC/FUNCintent/FUNCintent.py
+++ b/TestON/tests/FUNC/FUNCintent/FUNCintent.py
@@ -49,6 +49,7 @@
             main.rerouteSleep = int( main.params[ 'SLEEP' ][ 'reroute' ] )
             main.fwdSleep = int( main.params[ 'SLEEP' ][ 'fwd' ] )
             main.checkTopoAttempts = int( main.params[ 'SLEEP' ][ 'topoAttempts' ] )
+            main.flowDurationSleep = int( main.params[ 'SLEEP' ][ 'flowDuration' ] )
             gitPull = main.params[ 'GIT' ][ 'pull' ]
             main.numSwitch = int( main.params[ 'MININET' ][ 'switch' ] )
             main.numLinks = int( main.params[ 'MININET' ][ 'links' ] )
diff --git a/TestON/tests/FUNC/FUNCintent/dependencies/FuncIntentFunction.py b/TestON/tests/FUNC/FUNCintent/dependencies/FuncIntentFunction.py
index cbf783f..89695a2 100755
--- a/TestON/tests/FUNC/FUNCintent/dependencies/FuncIntentFunction.py
+++ b/TestON/tests/FUNC/FUNCintent/dependencies/FuncIntentFunction.py
@@ -93,9 +93,16 @@
     # Check intents state
     if utilities.retry( f=checkIntentState, retValue=main.FALSE,
                         args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
-        return intentId
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
         main.log.error( "Host Intent did not install correctly" )
+        main.assertReturnString += 'Install Intent State Failed\n'
         return main.FALSE
 
 def testHostIntent( main,
@@ -401,8 +408,15 @@
         return main.FALSE
 
     # Check intents state
-    if utilities.retry( f=checkIntentState, retValue=main.FALSE, args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
-        return intentId
+    if utilities.retry( f=checkIntentState, retValue=main.FALSE,
+                        args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
         main.log.error( "Point Intent did not install correctly" )
         return main.FALSE
@@ -804,8 +818,15 @@
         return main.FALSE
 
     # Check intents state
-    if utilities.retry( f=checkIntentState, retValue=main.FALSE, args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
-        return intentId
+    if utilities.retry( f=checkIntentState, retValue=main.FALSE,
+                        args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
         main.log.error( "Single to Multi Intent did not install correctly" )
         return main.FALSE
@@ -923,8 +944,15 @@
         return main.FALSE
 
     # Check intents state
-    if utilities.retry( f=checkIntentState, retValue=main.FALSE, args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
-        return intentId
+    if utilities.retry( f=checkIntentState, retValue=main.FALSE,
+                        args=( main, [ intentId ] ), sleep=main.checkIntentSleep ):
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
         main.log.error( "Multi to Single Intent did not install correctly" )
         return main.FALSE
@@ -1208,8 +1236,8 @@
 
         for recipient in recipients:
             if not recipient.get( "device" ):
-                main.log.warn( "Device not given for recipient {0}. Loading from\
-                                main.hostData".format( recipient.get( "name" ) ) )
+                main.log.warn( "Device not given for recipient {0}. Loading from " +\
+                                main.hostData.format( recipient.get( "name" ) ) )
                 recipient[ "device" ] = main.hostsData.get( recipient.get( "name" ) ).get( "location" )
     except (KeyError, TypeError):
         main.log.error( "There was a problem loading the hosts data." )
@@ -1887,3 +1915,43 @@
         main.ONOSbench.logReport( main.ONOSip[ i ],
                 [ "WARN" ],
                 "d" )
+
+def flowDuration( main ):
+    """
+        Check age of flows to see if flows are being overwritten
+    """
+    import time
+    main.log.info( "Getting current flow durations" )
+    flowsJson1 = main.CLIs[ 0 ].flows( noCore=True )
+    try:
+        flowsJson1 = json.loads( flowsJson1 )
+    except ValueError:
+        main.log.error( "Unable to read flows" )
+        return main.FALSE
+    flowLife = []
+    waitFlowLife = []
+    for device in flowsJson1:
+        if device.get( 'flowcount', 0 ) > 0:
+            for i in range( device[ 'flowCount' ] ):
+                flowLife.append( device[ 'flows' ][ i ][ 'life' ] )
+    main.log.info( "Sleeping for {} seconds".format( main.flowDurationSleep ) )
+    time.sleep( main.flowDurationSleep )
+    main.log.info( "Getting new flow durations" )
+    flowsJson2 = main.CLIs[ 0 ].flows( noCore=True )
+    try:
+        flowsJson2 = json.loads( flowsJson2 )
+    except ValueError:
+        main.log.error( "Unable to read flows" )
+        return main.FALSE
+    for device in flowsJson2:
+        if device.get( 'flowcount', 0 ) > 0:
+            for i in range( device[ 'flowCount' ] ):
+                waitFlowLife.append( device[ 'flows' ][ i ][ 'life' ] )
+    main.log.info( "Determining whether flows where overwritten" )
+    if len( flowLife ) == len( waitFlowLife ):
+        for i in range( len( flowLife) ):
+            if waitFlowLife[ i ] - flowLife[ i ] < main.flowDurationSleep:
+                return main.FALSE
+    else:
+        return main.FALSE
+    return main.TRUE
diff --git a/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.params b/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.params
index d91559d..4b3af6a 100644
--- a/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.params
+++ b/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.params
@@ -50,6 +50,7 @@
         <fwd>10</fwd>
         <addIntent>10</addIntent>
         <topoAttempts>3</topoAttempts>
+        <flowDuration>10</flowDuration>
     </SLEEP>
 
     <MININET>
diff --git a/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.py b/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.py
index 3824ea3..26dabed 100644
--- a/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.py
+++ b/TestON/tests/FUNC/FUNCintentRest/FUNCintentRest.py
@@ -59,6 +59,7 @@
             main.fwdSleep = int( main.params[ 'SLEEP' ][ 'fwd' ] )
             main.addIntentSleep = int( main.params[ 'SLEEP' ][ 'addIntent' ] )
             main.checkTopoAttempts = int( main.params[ 'SLEEP' ][ 'topoAttempts' ] )
+            main.flowDurationSleep = int( main.params[ 'SLEEP' ][ 'flowDuration' ] )
             gitPull = main.params[ 'GIT' ][ 'pull' ]
             main.numSwitch = int( main.params[ 'MININET' ][ 'switch' ] )
             main.numLinks = int( main.params[ 'MININET' ][ 'links' ] )
diff --git a/TestON/tests/FUNC/FUNCintentRest/dependencies/FuncIntentFunction.py b/TestON/tests/FUNC/FUNCintentRest/dependencies/FuncIntentFunction.py
index 5d526de..92d100f 100755
--- a/TestON/tests/FUNC/FUNCintentRest/dependencies/FuncIntentFunction.py
+++ b/TestON/tests/FUNC/FUNCintentRest/dependencies/FuncIntentFunction.py
@@ -94,11 +94,18 @@
         main.log.error( errorMsg )
         return main.FALSE
 
-    if utilities.retry ( f=checkIntentState, retValue=main.FALSE,
-                         args = (main, intentsId ), sleep=main.checkIntentSleep ):
-        return intentsId
+    if utilities.retry( f=checkIntentState, retValue=main.FALSE,
+                        args=( main, intentsId ), sleep=main.checkIntentSleep, attempts=5 ):
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentsId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
         main.log.error( "Host Intent did not install correctly" )
+        main.assertReturnString += 'Install Intent State Failed\n'
         return main.FALSE
 
 def testHostIntent( main,
@@ -398,17 +405,24 @@
         intentsId = main.CLIs[ 0 ].getIntentsId()
     except (KeyError, TypeError):
         errorMsg = "There was a problem loading the hosts data."
-        if intentId:
+        if intentsId:
             errorMsg += "  There was a problem installing Point to Point intent."
         main.log.error( errorMsg )
         return main.FALSE
 
     # Check intent state
-    if utilities.retry ( f=checkIntentState, retValue=main.FALSE,
-                         args = (main, intentsId ), sleep=main.checkIntentSleep ):
-        return intentsId
+    if utilities.retry( f=checkIntentState, retValue=main.FALSE,
+                        args=( main, intentsId ), sleep=main.checkIntentSleep ):
+        main.assertReturnString += 'Install Intent State Passed\n'
+        if flowDuration( main ):
+            main.assertReturnString += 'Flow duration check Passed\n'
+            return intentsId
+        else:
+            main.assertReturnString += 'Flow duration check failed\n'
+            return main.FALSE
     else:
-        main.log.error( "Single to Single point intent did not install correctly" )
+        main.log.error( "Host Intent did not install correctly" )
+        main.assertReturnString += 'Install Intent State Failed\n'
         return main.FALSE
 
 def testPointIntent( main,
@@ -1771,3 +1785,41 @@
         main.ONOSbench.logReport( main.ONOSip[ i ],
                 [ "WARN" ],
                 "d" )
+
+def flowDuration( main ):
+    """
+        Check age of flows to see if flows are being overwritten
+    """
+    import time
+    main.log.info( "Getting current flow durations" )
+    flowsJson1 = main.CLIs[ 0 ].flows()
+    try:
+        flowsJson1 = json.loads( flowsJson1 )
+    except ValueError:
+        main.log.error( "Unable to read flows" )
+        return main.FALSE
+    flowLife = []
+    waitFlowLife = []
+    for flow in flowsJson1:
+        if flow[ 'appId' ] == "org.onosproject.net.intent":
+            flowLife.append( flow[ 'life' ] )
+    main.log.info( "Sleeping for {} seconds".format( main.flowDurationSleep ) )
+    time.sleep( main.flowDurationSleep )
+    main.log.info( "Getting new flow durations" )
+    flowsJson2 = main.CLIs[ 0 ].flows()
+    try:
+        flowsJson2 = json.loads( flowsJson2 )
+    except ValueError:
+        main.log.error( "Unable to read flows" )
+        return main.FALSE
+    for flow in flowsJson2:
+        if flow[ 'appId' ] == "org.onosproject.net.intent":
+            waitFlowLife.append( flow[ 'life' ] )
+    main.log.info( "Determining whether flows where overwritten" )
+    if len( flowLife ) == len( waitFlowLife ):
+        for i in range( len( flowLife) ):
+            if waitFlowLife[ i ] - flowLife[ i ] < main.flowDurationSleep:
+                return main.FALSE
+    else:
+        return main.FALSE
+    return main.TRUE
\ No newline at end of file
diff --git a/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.params b/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.params
index 79e8620..0abc6b7 100755
--- a/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.params
+++ b/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.params
@@ -7,8 +7,8 @@
     # 100 - balance master and bring onos node down
     # 200 - bring onos node up and balance masters
     # 1000 - report logs
-
-    <testcases>1,[2,10,300,11,100,300,11,200,300,11,1000]*3</testcases>
+    # 1,[2,10,300,11,100,300,11,200,300,11,1000]*3
+    <testcases>1,[2,10,300,11,1000]*10</testcases>
 
     <DEPENDENCY>
         <path>/tests/SCPF/SCPFscaleTopo/dependencies/</path>
@@ -19,7 +19,7 @@
     </DEPENDENCY>
 
     <ENV>
-        <cellApps>drivers,openflow,fwd</cellApps>
+        <cellApps>drivers,openflow</cellApps>
     </ENV>
 
     <GIT>
@@ -38,6 +38,7 @@
         <nodeSleep>10</nodeSleep>
         <pingall>15</pingall>
         <MNsleep>60</MNsleep>
+        <host>0</host>
     </SLEEP>
 
     <TIMEOUT>
@@ -52,7 +53,8 @@
 
     <TOPOLOGY>
         <topology>torus</topology>
-        <scale>10,15,20</scale>
+        <scale>20,25,30,35,40,45,50,55,60</scale>
+        <host>True</host>
     </TOPOLOGY>
 
 </PARAMS>
diff --git a/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.py b/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.py
index 71c7d3a..e8e5b94 100644
--- a/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.py
+++ b/TestON/tests/SCPF/SCPFscaleTopo/SCPFscaleTopo.py
@@ -8,10 +8,8 @@
         self.default = ''
 
     def CASE1( self, main ):
-        import time
         import os
         import imp
-        import re
 
         """
         - Construct tests variables
@@ -48,6 +46,12 @@
         main.pingallSleep = int( main.params[ 'SLEEP' ][ 'pingall' ] )
         main.MNSleep = int( main.params[ 'SLEEP' ][ 'MNsleep' ] )
         main.pingTimeout = float( main.params[ 'TIMEOUT' ][ 'pingall' ] )
+        main.hostDiscover = main.params[ 'TOPOLOGY' ][ 'host' ]
+        main.hostDiscoverSleep = float( main.params['SLEEP']['host'] )
+        if main.hostDiscover == 'True':
+            main.hostDiscover = True
+        else:
+            main.hostDiscover = False
         gitPull = main.params[ 'GIT' ][ 'pull' ]
         main.homeDir = os.path.expanduser('~')
         main.cellData = {} # for creating cell file
@@ -118,6 +122,7 @@
         - Install ONOS cluster
         - Connect to cli
         """
+        import time
         main.log.info( "Checking if mininet is already running" )
         if len( main.topoScale ) < main.topoScaleSize:
             main.log.info( "Mininet is already running. Stopping mininet." )
@@ -234,7 +239,6 @@
         """
             Starting up torus topology
         """
-        import json
 
         main.case( "Starting up Mininet and verifying topology" )
         main.caseExplanation = "Starting Mininet with a scalling topology and " +\
@@ -245,9 +249,8 @@
         main.step( "Starting up TORUS %sx%s topology" % (main.currScale, main.currScale) )
 
         main.log.info( "Constructing Mininet command" )
-        mnCmd = " mn --custom " + main.Mininet1.home + main.multiovs +\
-                " --switch ovsm --topo " + main.topoName + ","+ main.currScale + "," + main.currScale
-
+        mnCmd = " mn --custom " + main.Mininet1.home + main.multiovs + \
+                " --switch ovsm --topo " + main.topoName + "," + main.currScale + "," + main.currScale
         for i in range( main.numCtrls ):
                 mnCmd += " --controller remote,ip=" + main.ONOSip[ i ]
 
@@ -263,11 +266,11 @@
 
     def CASE11( self, main ):
         """
-            Pingall, and compare topo
-            We don't care the pingall result,
+            Compare topo, and sending Arping package
             if the topology is same, then Pass.
         """
         import json
+        import time
 
         main.case( "Verifying topology: TORUS %sx%s" % (main.currScale, main.currScale) )
         main.caseExplanation = "Pinging all hosts and comparing topology " +\
@@ -275,10 +278,6 @@
 
         main.log.info( "Gathering topology information" )
         time.sleep( main.MNSleep )
-
-        devicesResults = main.TRUE
-        linksResults = main.TRUE
-        hostsResults = main.TRUE
         stepResult = main.TRUE
         main.step( "Comparing MN topology to ONOS topology" )
 
@@ -288,17 +287,14 @@
             devices = main.topo.getAllDevices( main )
             ports = main.topo.getAllPorts( main )
             links = main.topo.getAllLinks( main)
-            clusters = main.topo.getAllClusters( main )
             mnSwitches = main.Mininet1.getSwitches()
             mnLinks = main.Mininet1.getLinks(timeout=180)
-            mnHosts = main.Mininet1.getHosts()
 
             for controller in range(len(main.activeNodes)):
-                controllerStr = str( main.activeNodes[controller] + 1 )
-                if devices[ controller ] and ports[ controller ] and\
-                    "Error" not in devices[ controller ] and\
-                    "Error" not in ports[ controller ]:
-
+                # controllerStr = str( main.activeNodes[controller] + 1 )
+                if devices[ controller ] and ports[ controller ] and \
+                                "Error" not in devices[ controller ] and \
+                                "Error" not in ports[ controller ]:
                     currentDevicesResult = main.Mininet1.compareSwitches(
                             mnSwitches,
                             json.loads( devices[ controller ] ),
@@ -313,40 +309,52 @@
                 else:
                     currentLinksResult = main.FALSE
 
-                stepResult = currentDevicesResult and currentLinksResult
+                stepResult = stepResult and currentDevicesResult and currentLinksResult
             if stepResult:
                 break
             compareRetry += 1
+        utilities.assert_equals(expect=main.TRUE,
+                                actual=stepResult,
+                                onpass=" Topology match Mininet",
+                                onfail="ONOS Topology doesn't match Mininet")
 
-        # host discover
-        hostList=[]
-        for i in range( 1, int(main.currScale)+1 ):
-            for j in range( 1, int(main.currScale)+1 ):
-                hoststr = "h" + str(i)+ "x" + str(j)
-                hostList.append(hoststr)
-        totalNum = main.topo.sendArpPackage(main, hostList)
-        # check host number
-        main.log.info("{} hosts has been discovered".format( totalNum ))
-        if int(totalNum) == ( int(main.currScale) * int(main.currScale) ):
-            main.log.info("All hosts has been discovered")
-            stepResult = stepResult and main.TRUE
+        if stepResult:
+            if main.hostDiscover:
+                hostList = []
+                for i in range( 1, int( main.currScale ) + 1 ):
+                    for j in range( 1, int( main.currScale ) + 1) :
+                        # Generate host list
+                        hoststr = "h" + str(i) + "x" + str(j)
+                        hostList.append(hoststr)
+                for i in range( len(hostList) ):
+                    totalHost = main.topo.sendArpPackage( main, hostList[i] )
+                    time.sleep( main.hostDiscoverSleep )
+                    if totalHost < 0:
+                        # if totalHost less than 0 which means dependence function has exception.
+                        main.log.info( "Error when discover host!" )
+                        break
+                if totalHost == int( main.currScale ) *  int( main.currScale ):
+                    main.log.info( "Discovered all hosts" )
+                    stepResult = stepResult and main.TRUE
+                else:
+                    main.log.warn( "Some hosts ware not discovered by ONOS... Topology doesn't match!" )
+                    stepResult = main.FALSE
+                utilities.assert_equals(expect=main.TRUE,
+                                        actual=stepResult,
+                                        onpass=" Topology match Mininet",
+                                        onfail="ONOS Topology doesn't match Mininet")
+            main.log.info( "Finished this iteration, continue to scale next topology." )
         else:
-            main.log.warn("Hosts number is not correct!")
-            stepResult = stepResult and main.FALSE
-
-        utilities.assert_equals( expect=main.TRUE,
-                                 actual=stepResult,
-                                 onpass=" Topology match Mininet",
-                                 onfail="ONOS" + controllerStr +
-                                 " Topology doesn't match Mininet" )
-
+            main.log.info( "Clean up and exit TestON. Finished this test." )
+            main.cleanup()
+            main.exit()
 
     def CASE100( self, main ):
         '''
            Bring Down node 3
         '''
 
-        main.case("Balancing Masters and bring ONOS node 3 down: TORUS %sx%s" % (main.currScale, main.currScale))
+        main.case("Bring ONOS node 3 down: TORUS %sx%s" % (main.currScale, main.currScale))
         main.caseExplanation = "Balance masters to make sure " +\
                         "each controller has some devices and " +\
                         "stop ONOS node 3 service. "
@@ -369,10 +377,10 @@
 
     def CASE200( self, main ):
         '''
-            Bring up onos node and balance masters
+            Bring up onos node
         '''
 
-        main.case("Bring ONOS node 3 up and balance masters: TORUS %sx%s" % (main.currScale, main.currScale))
+        main.case("Bring ONOS node 3 up: TORUS %sx%s" % (main.currScale, main.currScale))
         main.caseExplanation = "Bring node 3 back up and balance the masters"
 
         node = main.deadNode + 1
diff --git a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
index 4f7bfb7..22505ff 100644
--- a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
+++ b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
@@ -104,14 +104,23 @@
         send arping package from host
         return the total hosts number from Onos
     """
-    main.log.info("Sending Arping package...")
+    main.log.info( "Sending Arping package..." )
     if isinstance(hostList, list):
-        threads = []
         for h in hostList:
             main.Mininet1.arping( srcHost=h, dstHost="10.0.0.1", output=main.FALSE, noResult=True )
             time.sleep(0.5)
     else:
-        main.Mininet1.arping(srcHost=hostList)
-    summaryStr = json.loads( main.CLIs[0].summary().encode() )
-    hostNum = summaryStr.get('hosts')
+        main.Mininet1.arping( srcHost=hostList, dstHost="10.0.0.1", output=main.FALSE, noResult=True )
+    try:
+        summaryStr = ""
+        summaryStr = json.loads( main.CLIs[0].summary().encode() )
+        hostNum = summaryStr.get( 'hosts' )
+
+    except (TypeError, ValueError):
+        main.log.exception( " Object not as expected: {!r}".format( summaryStr) )
+        return -1
+    except Exception:
+        main.log.exception( self.name + ": Uncaught exception!" )
+        return -1
+
     return hostNum