diff --git a/TestON/drivers/common/cli/emulator/mininetclidriver.py b/TestON/drivers/common/cli/emulator/mininetclidriver.py
index ad16c5b..ef4c812 100644
--- a/TestON/drivers/common/cli/emulator/mininetclidriver.py
+++ b/TestON/drivers/common/cli/emulator/mininetclidriver.py
@@ -447,7 +447,7 @@
 
         except pexpect.TIMEOUT:
             main.log.exception( self.name + ": TIMEOUT exception" )
-            return main.FALSE 
+            return main.FALSE
         except pexpect.EOF:
             main.log.error( self.name + ": EOF exception found" )
             main.log.error( self.name + ":     " + self.handle.before )
diff --git a/TestON/tests/CHOtest/CHOtest.params b/TestON/tests/CHOtest/CHOtest.params
index fe54e05..ccf64c5 100644
--- a/TestON/tests/CHOtest/CHOtest.params
+++ b/TestON/tests/CHOtest/CHOtest.params
@@ -1,18 +1,25 @@
 <PARAMS>
-    # 1,20,3,[40,5,60,70,80,10,90,71,81,10,93,10]*50,21,3,[41,5,61,72,82,10,91,73,83,10,94,10]*50,22,3,[42,5,62,10,92,10,95,10,98,10]*50
+    # 1,20,3,[40,5,140,60,160,70,170,80,180,10,5,90,190,71,171,81,181,10,5]*50,21,3,[41,5,141,61,161,72,172,82,182,10,5,91,191,73,173,83,183,10,5]*50,22,3,[42,5,142,62,162,73,174,84,184,10,5,92,192,75,175,85,185,10,5]*50
     # 1. Starts ONOS cluster with 5 nodes
     # 20. Starts Att Topology
     # 21. Starts Chordal Topology
     # 22. Starts Spine-Leaf Topology
     # 3. Checks the consistency of ONOS and Mininet's topologies
     # 4X. Reactive forwarding | host discovery
+    # 14X. IPv6 Reative forwarding | host discovery
     # 5. ONOS Topology verification
     # 6X. host intents
+    # 16X. IPv6 ping across host intents
     # 7X. Bring random links down( Unique for each topology)
+    # 17X. IPv6 ping after link down
     # 8X. Bring random links back up
-    # 9X Point,Multi-single,Single-Multi Intents
+    # 18X. IPv6 ping after link backs up
+    # 9X. Point,Multi-single,Single-Multi Intents
+    # 19X. IPv6 ping across Point,Multi-single,Single-Multi Intents
 
-    <testcases>1,20,3,[40,5,60,70,80,10,90,71,81,10]*50,21,3,[41,5,61,72,82,10,91,73,83,10]*50,22,3,[42,5,62,74,84,10,92,10]*50</testcases>
+<testcases>
+1,20,3,[40,5,140,60,160,70,170,80,180,10,5,90,190,71,171,81,181,10,5]*50,21,3,[41,5,141,61,161,72,172,82,182,10,5,91,191,73,173,83,183,10,5]*50,22,3,[42,5,142,62,162,73,174,84,184,10,5,92,192,75,175,85,185,10,5]*50
+</testcases>
 
     <GIT>
         #autoPull 'on' or 'off'
@@ -26,7 +33,7 @@
     </CTRL>
 
     <TOPO1>
-        <topo>topoAtt.py</topo>
+        <topo>topoAttIpv6.py</topo>
         <numSwitches>25</numSwitches>
         <numHosts>25</numHosts>
         <numLinks>114</numLinks>
@@ -34,7 +41,7 @@
     </TOPO1>
 
     <TOPO2>
-        <topo>topoChordal.py</topo>
+        <topo>topoChordalIpv6.py</topo>
         <numSwitches>25</numSwitches>
         <numHosts>25</numHosts>
         <numLinks>600</numLinks>
@@ -42,7 +49,7 @@
     </TOPO2>
 
     <TOPO3>
-        <topo>topoSpine.py</topo>
+        <topo>topoSpineIpv6.py</topo>
         <numSwitches>78</numSwitches>
         <numHosts>68</numHosts>
         <numLinks>284</numLinks>
diff --git a/TestON/tests/CHOtest/CHOtest.py b/TestON/tests/CHOtest/CHOtest.py
index 6e58b68..62c9f56 100644
--- a/TestON/tests/CHOtest/CHOtest.py
+++ b/TestON/tests/CHOtest/CHOtest.py
@@ -143,8 +143,16 @@
         else:
             main.log.info("Successful CLI startup")
             startCliResult = main.TRUE
-        case1Result = installResult and uninstallResult and statusResult and startCliResult
-        time.sleep(30)
+
+        main.step( "Set IPv6 cfg parameters for Neighbor Discovery" )
+        cfgResult1 = main.CLIs[0].setCfg( "org.onosproject.proxyarp.ProxyArp", "ipv6NeighborDiscovery", "true" )
+        cfgResult2 = main.CLIs[0].setCfg( "org.onosproject.provider.host.impl.HostLocationProvider", "ipv6NeighborDiscovery", "true" )
+        cfgResult = cfgResult1 and cfgResult2
+        utilities.assert_equals( expect=main.TRUE, actual=cfgResult,
+                                 onpass="ipv6NeighborDiscovery cfg is set to true",
+                                 onfail="Failed to cfg set ipv6NeighborDiscovery" )
+
+        case1Result = installResult and uninstallResult and statusResult and startCliResult and cfgResult
         main.log.info("Time for connecting to CLI: %2f seconds" %(time2-time1))
         utilities.assert_equals( expect=main.TRUE, actual=case1Result,
                                  onpass="Set up test environment PASS",
@@ -510,38 +518,14 @@
             " seconds" )
 
         if ping_result == main.TRUE:
-            main.log.report( "Pingall Test in Reactive mode successful" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode successful" )
         else:
-            main.log.report( "Pingall Test in Reactive mode failed" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode failed" )
 
-        main.step( "Disable Reactive forwarding" )
-
-        main.log.info( "Uninstall reactive forwarding app" )
-        appResults = appResults and main.CLIs[0].deactivateApp( "org.onosproject.fwd" )
-        pool = []
-        for cli in main.CLIs:
-            t = main.Thread( target=cli.appToIDCheck,
-                             name="appToIDCheck-" + str( i ),
-                             args=[] )
-            pool.append( t )
-            t.start()
-
-        for t in pool:
-            t.join()
-            appCheck = appCheck and t.result
-        utilities.assert_equals( expect=main.TRUE, actual=appCheck,
-                                 onpass="App Ids seem to be correct",
-                                 onfail="Something is wrong with app Ids" )
-        if appCheck != main.TRUE:
-            main.log.warn( main.CLIs[0].apps() )
-            main.log.warn( main.CLIs[0].appIDs() )
-
-        # Waiting for reative flows to be cleared.
-        time.sleep( 30 )
-        case40Result =  installResult and uninstallResult and ping_result
+        case40Result =  appCheck and ping_result
         utilities.assert_equals( expect=main.TRUE, actual=case40Result,
-                                 onpass="Reactive Mode Pingall test PASS",
-                                 onfail="Reactive Mode Pingall test FAIL" )
+                                 onpass="Reactive Mode IPv4 Pingall test PASS",
+                                 onfail="Reactive Mode IPv4 Pingall test FAIL" )
 
     def CASE41( self, main ):
         """
@@ -590,38 +574,14 @@
             " seconds" )
 
         if ping_result == main.TRUE:
-            main.log.report( "Pingall Test in Reactive mode successful" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode successful" )
         else:
-            main.log.report( "Pingall Test in Reactive mode failed" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode failed" )
 
-        main.step( "Disable Reactive forwarding" )
-
-        main.log.info( "Uninstall reactive forwarding app" )
-        appResults = appResults and main.CLIs[0].deactivateApp( "org.onosproject.fwd" )
-        pool = []
-        for cli in main.CLIs:
-            t = main.Thread( target=cli.appToIDCheck,
-                             name="appToIDCheck-" + str( i ),
-                             args=[] )
-            pool.append( t )
-            t.start()
-
-        for t in pool:
-            t.join()
-            appCheck = appCheck and t.result
-        utilities.assert_equals( expect=main.TRUE, actual=appCheck,
-                                 onpass="App Ids seem to be correct",
-                                 onfail="Something is wrong with app Ids" )
-        if appCheck != main.TRUE:
-            main.log.warn( main.CLIs[0].apps() )
-            main.log.warn( main.CLIs[0].appIDs() )
-
-        # Waiting for reative flows to be cleared.
-        time.sleep( 30 )
-        case41Result =  installResult and uninstallResult and ping_result
+        case41Result =  appCheck and ping_result
         utilities.assert_equals( expect=main.TRUE, actual=case41Result,
-                                 onpass="Reactive Mode Pingall test PASS",
-                                 onfail="Reactive Mode Pingall test FAIL" )
+                                 onpass="Reactive Mode IPv4 Pingall test PASS",
+                                 onfail="Reactive Mode IPv4 Pingall test FAIL" )
 
     def CASE42( self, main ):
         """
@@ -670,13 +630,55 @@
             " seconds" )
 
         if ping_result == main.TRUE:
-            main.log.report( "Pingall Test in Reactive mode successful" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode successful" )
         else:
-            main.log.report( "Pingall Test in Reactive mode failed" )
+            main.log.report( "IPv4 Pingall Test in Reactive mode failed" )
+
+        case42Result =  appCheck and ping_result
+        utilities.assert_equals( expect=main.TRUE, actual=case42Result,
+                                 onpass="Reactive Mode IPv4 Pingall test PASS",
+                                 onfail="Reactive Mode IPv4 Pingall test FAIL" )
+
+    def CASE140( self, main ):
+        """
+        Verify IPv6 Reactive forwarding (Att Topology)
+        """
+        import re
+        import copy
+        import time
+        main.log.report( "Verify IPv6 Reactive forwarding (Att Topology)" )
+        main.log.report( "______________________________________________" )
+        main.case( "Enable IPv6 Reactive forwarding and Verify ping all" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+
+        main.step( "Set IPv6 cfg parameters for Reactive forwarding" )
+        cfgResult1 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "ipv6Forwarding", "true" )
+        cfgResult2 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "matchIpv6Address", "true" )
+        cfgResult = cfgResult1 and cfgResult2
+        utilities.assert_equals( expect=main.TRUE, actual=cfgResult,
+                                 onpass="Reactive mode ipv6Fowarding cfg is set to true",
+                                 onfail="Failed to cfg set Reactive mode ipv6Fowarding" )
+
+        main.step( "Verify IPv6 Pingall" )
+        ping_result = main.FALSE
+        time1 = time.time()
+        ping_result = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+
+        if ping_result == main.TRUE:
+            main.log.report( "IPv6 Pingall Test in Reactive mode successful" )
+        else:
+            main.log.report( "IPv6 Pingall Test in Reactive mode failed" )
 
         main.step( "Disable Reactive forwarding" )
 
         main.log.info( "Uninstall reactive forwarding app" )
+        appCheck = main.TRUE
         appResults = appResults and main.CLIs[0].deactivateApp( "org.onosproject.fwd" )
         pool = []
         for cli in main.CLIs:
@@ -698,10 +700,142 @@
 
         # Waiting for reative flows to be cleared.
         time.sleep( 30 )
-        case42Result =  installResult and uninstallResult and ping_result
-        utilities.assert_equals( expect=main.TRUE, actual=case42Result,
-                                 onpass="Reactive Mode Pingall test PASS",
-                                 onfail="Reactive Mode Pingall test FAIL" )
+        case140Result =  appCheck and cfgResult and ping_result
+        utilities.assert_equals( expect=main.TRUE, actual=case140Result,
+                                 onpass="Reactive Mode IPv6 Pingall test PASS",
+                                 onfail="Reactive Mode IPv6 Pingall test FAIL" )
+
+    def CASE141( self, main ):
+        """
+        Verify IPv6 Reactive forwarding (Chordal Topology)
+        """
+        import re
+        import copy
+        import time
+        main.log.report( "Verify IPv6 Reactive forwarding (Chordal Topology)" )
+        main.log.report( "______________________________________________" )
+        main.case( "Enable IPv6 Reactive forwarding and Verify ping all" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+
+        main.step( "Set IPv6 cfg parameters for Reactive forwarding" )
+        cfgResult1 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "ipv6Forwarding", "true" )
+        cfgResult2 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "matchIpv6Address", "true" )
+        cfgResult = cfgResult1 and cfgResult2
+        utilities.assert_equals( expect=main.TRUE, actual=cfgResult,
+                                 onpass="Reactive mode ipv6Fowarding cfg is set to true",
+                                 onfail="Failed to cfg set Reactive mode ipv6Fowarding" )
+
+        main.step( "Verify IPv6 Pingall" )
+        ping_result = main.FALSE
+        time1 = time.time()
+        ping_result = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+
+        if ping_result == main.TRUE:
+            main.log.report( "IPv6 Pingall Test in Reactive mode successful" )
+        else:
+            main.log.report( "IPv6 Pingall Test in Reactive mode failed" )
+
+        main.step( "Disable Reactive forwarding" )
+
+        main.log.info( "Uninstall reactive forwarding app" )
+        appCheck = main.TRUE
+        appResults = appResults and main.CLIs[0].deactivateApp( "org.onosproject.fwd" )
+        pool = []
+        for cli in main.CLIs:
+            t = main.Thread( target=cli.appToIDCheck,
+                             name="appToIDCheck-" + str( i ),
+                             args=[] )
+            pool.append( t )
+            t.start()
+
+        for t in pool:
+            t.join()
+            appCheck = appCheck and t.result
+        utilities.assert_equals( expect=main.TRUE, actual=appCheck,
+                                 onpass="App Ids seem to be correct",
+                                 onfail="Something is wrong with app Ids" )
+        if appCheck != main.TRUE:
+            main.log.warn( main.CLIs[0].apps() )
+            main.log.warn( main.CLIs[0].appIDs() )
+
+        # Waiting for reative flows to be cleared.
+        time.sleep( 30 )
+        case140Result =  appCheck and cfgResult and ping_result
+        utilities.assert_equals( expect=main.TRUE, actual=case140Result,
+                                 onpass="Reactive Mode IPv6 Pingall test PASS",
+                                 onfail="Reactive Mode IPv6 Pingall test FAIL" )
+
+    def CASE142( self, main ):
+        """
+        Verify IPv6 Reactive forwarding (Spine Topology)
+        """
+        import re
+        import copy
+        import time
+        main.log.report( "Verify IPv6 Reactive forwarding (Spine Topology)" )
+        main.log.report( "______________________________________________" )
+        main.case( "Enable IPv6 Reactive forwarding and Verify ping all" )
+        # Spine topology do not have hosts h1-h10
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        main.step( "Set IPv6 cfg parameters for Reactive forwarding" )
+        cfgResult1 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "ipv6Forwarding", "true" )
+        cfgResult2 = main.CLIs[0].setCfg( "org.onosproject.fwd.ReactiveForwarding", "matchIpv6Address", "true" )
+        cfgResult = cfgResult1 and cfgResult2
+        utilities.assert_equals( expect=main.TRUE, actual=cfgResult,
+                                 onpass="Reactive mode ipv6Fowarding cfg is set to true",
+                                 onfail="Failed to cfg set Reactive mode ipv6Fowarding" )
+
+        main.step( "Verify IPv6 Pingall" )
+        ping_result = main.FALSE
+        time1 = time.time()
+        ping_result = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+
+        if ping_result == main.TRUE:
+            main.log.report( "IPv6 Pingall Test in Reactive mode successful" )
+        else:
+            main.log.report( "IPv6 Pingall Test in Reactive mode failed" )
+
+        main.step( "Disable Reactive forwarding" )
+
+        main.log.info( "Uninstall reactive forwarding app" )
+        appCheck = main.TRUE
+        appResults = appResults and main.CLIs[0].deactivateApp( "org.onosproject.fwd" )
+        pool = []
+        for cli in main.CLIs:
+            t = main.Thread( target=cli.appToIDCheck,
+                             name="appToIDCheck-" + str( i ),
+                             args=[] )
+            pool.append( t )
+            t.start()
+
+        for t in pool:
+            t.join()
+            appCheck = appCheck and t.result
+        utilities.assert_equals( expect=main.TRUE, actual=appCheck,
+                                 onpass="App Ids seem to be correct",
+                                 onfail="Something is wrong with app Ids" )
+        if appCheck != main.TRUE:
+            main.log.warn( main.CLIs[0].apps() )
+            main.log.warn( main.CLIs[0].appIDs() )
+
+        # Waiting for reative flows to be cleared.
+        time.sleep( 30 )
+        case142Result =  appCheck and cfgResult and ping_result
+        utilities.assert_equals( expect=main.TRUE, actual=case142Result,
+                                 onpass="Reactive Mode IPv6 Pingall test PASS",
+                                 onfail="Reactive Mode IPv6 Pingall test FAIL" )
 
     def CASE5( self, main ):
         """
@@ -995,6 +1129,99 @@
             onpass="Install 2278 Host Intents and Ping All test PASS",
             onfail="Install 2278 Host Intents and Ping All test FAIL" )
 
+    def CASE160( self ):
+        """
+        Verify IPv6 ping across 300 host intents (Att Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 300 host intents (Att Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 300 host intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case160Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case160Result,
+            onpass="IPv6 Ping across 300 host intents test PASS",
+            onfail="IPv6 Ping across 300 host intents test FAIL" )
+
+    def CASE161( self ):
+        """
+        Verify IPv6 ping across 600 host intents (Chordal Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 600 host intents (Chordal Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 600 host intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case161Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case161Result,
+            onpass="IPv6 Ping across 600 host intents test PASS",
+            onfail="IPv6 Ping across 600 host intents test FAIL" )
+
+    def CASE162( self ):
+        """
+        Verify IPv6 ping across 2278 host intents (Spine Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 2278 host intents (Spine Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 600 host intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case162Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case162Result,
+            onpass="IPv6 Ping across 600 host intents test PASS",
+            onfail="IPv6 Ping across 600 host intents test FAIL" )
+
     def CASE70( self, main ):
         """
         Randomly bring some core links down and verify ping all ( Host Intents-Att Topo)
@@ -1639,6 +1866,378 @@
                                  onpass="Link Up Test PASS",
                                  onfail="Link Up Test FAIL" )
 
+    def CASE170( self ):
+        """
+        IPv6 ping all with some core links down( Host Intents-Att Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Host Intents-Att Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Host Intents-Att Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case170Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case170Result,
+            onpass="IPv6 Ping across 300 host intents test PASS",
+            onfail="IPv6 Ping across 300 host intents test FAIL" )
+
+    def CASE180( self ):
+        """
+        IPv6 ping all with after core links back up( Host Intents-Att Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Host Intents-Att Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Host Intents-Att Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case180Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case180Result,
+            onpass="IPv6 Ping across 300 host intents test PASS",
+            onfail="IPv6 Ping across 300 host intents test FAIL" )
+
+    def CASE171( self ):
+        """
+        IPv6 ping all with some core links down( Point Intents-Att Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Point Intents-Att Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Point Intents-Att Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case171Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case171Result,
+            onpass="IPv6 Ping across 600 point intents test PASS",
+            onfail="IPv6 Ping across 600 point intents test FAIL" )
+
+    def CASE181( self ):
+        """
+        IPv6 ping all with after core links back up( Point Intents-Att Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Point Intents-Att Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Point Intents-Att Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case181Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case181Result,
+            onpass="IPv6 Ping across 600 Point intents test PASS",
+            onfail="IPv6 Ping across 600 Point intents test FAIL" )
+
+    def CASE172( self ):
+        """
+        IPv6 ping all with some core links down( Host Intents-Chordal Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Host Intents-Chordal Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Host Intents-Chordal Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case172Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case172Result,
+            onpass="IPv6 Ping across 300 host intents test PASS",
+            onfail="IPv6 Ping across 300 host intents test FAIL" )
+
+    def CASE182( self ):
+        """
+        IPv6 ping all with after core links back up( Host Intents-Chordal Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Host Intents-Chordal Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Host Intents-Chordal Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case182Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case182Result,
+            onpass="IPv6 Ping across 300 host intents test PASS",
+            onfail="IPv6 Ping across 300 host intents test FAIL" )
+
+    def CASE173( self ):
+        """
+        IPv6 ping all with some core links down( Point Intents-Chordal Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Point Intents-Chordal Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Point Intents-Chordal Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case173Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case173Result,
+            onpass="IPv6 Ping across 600 point intents test PASS",
+            onfail="IPv6 Ping across 600 point intents test FAIL" )
+
+    def CASE183( self ):
+        """
+        IPv6 ping all with after core links back up( Point Intents-Chordal Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Point Intents-Chordal Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Point Intents-Chordal Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case183Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case183Result,
+            onpass="IPv6 Ping across 600 Point intents test PASS",
+            onfail="IPv6 Ping across 600 Point intents test FAIL" )
+
+    def CASE174( self ):
+        """
+        IPv6 ping all with some core links down( Host Intents-Spine Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Host Intents-Spine Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Host Intents-Spine Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case174Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case174Result,
+            onpass="IPv6 Ping across 2278 host intents test PASS",
+            onfail="IPv6 Ping across 2278 host intents test FAIL" )
+
+    def CASE184( self ):
+        """
+        IPv6 ping all with after core links back up( Host Intents-Spine Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Host Intents-Spine Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Host Intents-Spine Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case184Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case184Result,
+            onpass="IPv6 Ping across 2278 host intents test PASS",
+            onfail="IPv6 Ping across 2278 host intents test FAIL" )
+
+    def CASE175( self ):
+        """
+        IPv6 ping all with some core links down( Point Intents-Spine Topo)
+        """
+        main.log.report( "IPv6 ping all with some core links down( Point Intents-Spine Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with some core links down( Point Intents-Spine Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case175Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case175Result,
+            onpass="IPv6 Ping across 4556 point intents test PASS",
+            onfail="IPv6 Ping across 4556 point intents test FAIL" )
+
+    def CASE185( self ):
+        """
+        IPv6 ping all with after core links back up( Point Intents-Spine Topo)
+        """
+        main.log.report( "IPv6 ping all with after core links back up( Point Intents-Spine Topo )" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all with after core links back up( Point Intents-Spine Topo )" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case183Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case183Result,
+            onpass="IPv6 Ping across 4556 Point intents test PASS",
+            onfail="IPv6 Ping across 4556 Point intents test FAIL" )
+
     def CASE90( self ):
         """
         Install 600 point intents and verify ping all (Att Topology)
@@ -1662,7 +2261,7 @@
                 t = main.Thread( target=cli.addPointIntent,
                         threadID=main.threadID,
                         name="addPointIntent",
-                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,"IPV4",main.MACsDict.get(deviceCombos[i][0]),main.MACsDict.get(deviceCombos[i][1])])
+                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,'',main.MACsDict.get(deviceCombos[i][0]),main.MACsDict.get(deviceCombos[i][1])])
                 pool.append(t)
                 t.start()
                 i = i + 1
@@ -1724,7 +2323,7 @@
                 t = main.Thread( target=cli.addPointIntent,
                         threadID=main.threadID,
                         name="addPointIntent",
-                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,"IPV4","",main.MACsDict.get(deviceCombos[i][1])])
+                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,"","",main.MACsDict.get(deviceCombos[i][1])])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -1790,7 +2389,7 @@
                 t = main.Thread( target=cli.addPointIntent,
                         threadID=main.threadID,
                         name="addPointIntent",
-                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,"IPV4","",main.MACsDict.get(deviceCombos[i][1])])
+                        args=[deviceCombos[i][0],deviceCombos[i][1],1,1,"","",main.MACsDict.get(deviceCombos[i][1])])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -1856,7 +2455,7 @@
                 t = main.Thread( target=cli.addMultipointToSinglepointIntent,
                         threadID=main.threadID,
                         name="addMultipointToSinglepointIntent",
-                        args =[ingressDeviceList,egressDevice,portIngressList,'1','IPV4','',main.MACsDict.get(egressDevice)])
+                        args =[ingressDeviceList,egressDevice,portIngressList,'1','','',main.MACsDict.get(egressDevice)])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -1931,7 +2530,7 @@
                 t = main.Thread( target=cli.addMultipointToSinglepointIntent,
                         threadID=main.threadID,
                         name="addMultipointToSinglepointIntent",
-                        args =[ingressDeviceList,egressDevice,portIngressList,'1','IPV4','',main.MACsDict.get(egressDevice)])
+                        args =[ingressDeviceList,egressDevice,portIngressList,'1','','',main.MACsDict.get(egressDevice)])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -1988,7 +2587,7 @@
                 t = main.Thread( target=cli.addSinglepointToMultipointIntent,
                         threadID=main.threadID,
                         name="addSinglepointToMultipointIntent",
-                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'IPV4',main.MACsDict.get(ingressDevice)])
+                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'',main.MACsDict.get(ingressDevice)])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -2043,7 +2642,7 @@
                 t = main.Thread( target=cli.addSinglepointToMultipointIntent,
                         threadID=main.threadID,
                         name="addSinglepointToMultipointIntent",
-                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'IPV4',main.MACsDict.get(ingressDevice),''])
+                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'',main.MACsDict.get(ingressDevice),''])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -2105,7 +2704,7 @@
                 t = main.Thread( target=cli.addSinglepointToMultipointIntent,
                         threadID=main.threadID,
                         name="addSinglepointToMultipointIntent",
-                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'IPV4',MACsDictCopy.get(ingressDevice),''])
+                        args =[ingressDevice,egressDeviceList,'1',portEgressList,'',MACsDictCopy.get(ingressDevice),''])
                 pool.append(t)
                 #time.sleep(1)
                 t.start()
@@ -2135,6 +2734,99 @@
             onpass="Install 25 single to multi point Intents and Ping All test PASS",
             onfail="Install 25 single to multi point Intents and Ping All test FAIL" )
 
+    def CASE190( self ):
+        """
+        Verify IPv6 ping across 600 Point intents (Att Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 600 Point intents (Att Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 600 Point intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case160Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case160Result,
+            onpass="IPv6 Ping across 600 Point intents test PASS",
+            onfail="IPv6 Ping across 600 Point intents test FAIL" )
+
+    def CASE191( self ):
+        """
+        Verify IPv6 ping across 600 Point intents (Chordal Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 600 Point intents (Chordal Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 600 Point intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 1)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case191Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case191Result,
+            onpass="IPv6 Ping across 600 Point intents test PASS",
+            onfail="IPv6 Ping across 600 Point intents test FAIL" )
+
+    def CASE192( self ):
+        """
+        Verify IPv6 ping across 4556 Point intents (Spine Topology)
+        """
+        main.log.report( "Verify IPv6 ping across 4556 Point intents (Spine Topology)" )
+        main.log.report( "_________________________________________________" )
+        import itertools
+        import time
+        main.case( "IPv6 ping all 600 Point intents" )
+        main.step( "Verify IPv6 Ping across all hosts" )
+        hostList = [ ('h'+ str(x + 11)) for x in range (main.numMNhosts) ]
+        pingResult = main.FALSE
+        time1 = time.time()
+        pingResult = main.Mininet1.pingIpv6Hosts( hostList, prefix='1000::' )
+        time2 = time.time()
+        timeDiff = round( ( time2 - time1 ), 2 )
+        main.log.report(
+            "Time taken for IPv6 Ping All: " +
+            str( timeDiff ) +
+            " seconds" )
+        utilities.assert_equals( expect=main.TRUE, actual=pingResult,
+                                 onpass="PING ALL PASS",
+                                 onfail="PING ALL FAIL" )
+
+        case192Result = pingResult
+        utilities.assert_equals(
+            expect=main.TRUE,
+            actual=case192Result,
+            onpass="IPv6 Ping across 600 Point intents test PASS",
+            onfail="IPv6 Ping across 600 Point intents test FAIL" )
+
     def CASE10( self ):
         import time
         import re
diff --git a/TestON/tests/CHOtest/Dependencies/topoAttIpv6.py b/TestON/tests/CHOtest/Dependencies/topoAttIpv6.py
new file mode 100755
index 0000000..c5ca4c7
--- /dev/null
+++ b/TestON/tests/CHOtest/Dependencies/topoAttIpv6.py
@@ -0,0 +1,190 @@
+#!/usr/bin/python
+
+"""
+Custom topology for Mininet
+"""
+from mininet.topo import Topo
+from mininet.net import Mininet
+from mininet.node import Host, RemoteController
+from mininet.node import Node
+from mininet.node import CPULimitedHost
+from mininet.link import TCLink
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.util import dumpNodeConnections
+from mininet.node import ( UserSwitch, OVSSwitch, IVSSwitch )
+
+class dualStackHost( Host ):
+    def config( self, v6Addr='1000:1/64', **params ):
+        r = super( Host, self ).config( **params )
+        intf = self.defaultIntf()
+        self.cmd( 'ip -6 addr add %s dev %s' % ( v6Addr, intf ) )
+        return r
+
+class attTopo( Topo ):
+
+    def __init__( self, **opts ):
+        "Create a topology."
+
+        # Initialize Topology
+        Topo.__init__( self, **opts )
+
+        # add nodes, switches first...
+        NY54 = self.addSwitch( 's1' )
+        CMBR = self.addSwitch( 's2' )
+        CHCG = self.addSwitch( 's3' )
+        CLEV = self.addSwitch( 's4' )
+        RLGH = self.addSwitch( 's5' )
+        ATLN = self.addSwitch( 's6' )
+        PHLA = self.addSwitch( 's7' )
+        WASH = self.addSwitch( 's8' )
+        NSVL = self.addSwitch( 's9' )
+        STLS = self.addSwitch( 's10' )
+        NWOR = self.addSwitch( 's11' )
+        HSTN = self.addSwitch( 's12' )
+        SNAN = self.addSwitch( 's13' )
+        DLLS = self.addSwitch( 's14' )
+        ORLD = self.addSwitch( 's15' )
+        DNVR = self.addSwitch( 's16' )
+        KSCY = self.addSwitch( 's17' )
+        SNFN = self.addSwitch( 's18' )
+        SCRM = self.addSwitch( 's19' )
+        PTLD = self.addSwitch( 's20' )
+        STTL = self.addSwitch( 's21' )
+        SLKC = self.addSwitch( 's22' )
+        LA03 = self.addSwitch( 's23' )
+        SNDG = self.addSwitch( 's24' )
+        PHNX = self.addSwitch( 's25' )
+
+        # ... and now hosts
+        NY54_host = self.addHost( 'h1', ip='10.1.0.1/24', cls=dualStackHost, v6Addr='1000::1/64' )
+        CMBR_host = self.addHost( 'h2', ip='10.1.0.2/24', cls=dualStackHost, v6Addr='1000::2/64' )
+        CHCG_host = self.addHost( 'h3', ip='10.1.0.3/24', cls=dualStackHost, v6Addr='1000::3/64' )
+        CLEV_host = self.addHost( 'h4', ip='10.1.0.4/24', cls=dualStackHost, v6Addr='1000::4/64' )
+        RLGH_host = self.addHost( 'h5', ip='10.1.0.5/24', cls=dualStackHost, v6Addr='1000::5/64' )
+        ATLN_host = self.addHost( 'h6', ip='10.1.0.6/24', cls=dualStackHost, v6Addr='1000::6/64' )
+        PHLA_host = self.addHost( 'h7', ip='10.1.0.7/24', cls=dualStackHost, v6Addr='1000::7/64' )
+        WASH_host = self.addHost( 'h8', ip='10.1.0.8/24', cls=dualStackHost, v6Addr='1000::8/64' )
+        NSVL_host = self.addHost( 'h9', ip='10.1.0.9/24', cls=dualStackHost, v6Addr='1000::9/64' )
+        STLS_host = self.addHost( 'h10', ip='10.1.0.10/24', cls=dualStackHost, v6Addr='1000::10/64' )
+        NWOR_host = self.addHost( 'h11', ip='10.1.0.11/24', cls=dualStackHost, v6Addr='1000::11/64' )
+        HSTN_host = self.addHost( 'h12', ip='10.1.0.12/24', cls=dualStackHost, v6Addr='1000::12/64' )
+        SNAN_host = self.addHost( 'h13', ip='10.1.0.13/24', cls=dualStackHost, v6Addr='1000::13/64' )
+        DLLS_host = self.addHost( 'h14', ip='10.1.0.14/24', cls=dualStackHost, v6Addr='1000::14/64' )
+        ORLD_host = self.addHost( 'h15', ip='10.1.0.15/24', cls=dualStackHost, v6Addr='1000::15/64' )
+        DNVR_host = self.addHost( 'h16', ip='10.1.0.16/24', cls=dualStackHost, v6Addr='1000::16/64' )
+        KSCY_host = self.addHost( 'h17', ip='10.1.0.17/24', cls=dualStackHost, v6Addr='1000::17/64' )
+        SNFN_host = self.addHost( 'h18', ip='10.1.0.18/24', cls=dualStackHost, v6Addr='1000::18/64' )
+        SCRM_host = self.addHost( 'h19', ip='10.1.0.19/24', cls=dualStackHost, v6Addr='1000::19/64' )
+        PTLD_host = self.addHost( 'h20', ip='10.1.0.20/24', cls=dualStackHost, v6Addr='1000::20/64' )
+        STTL_host = self.addHost( 'h21', ip='10.1.0.21/24', cls=dualStackHost, v6Addr='1000::21/64' )
+        SLKC_host = self.addHost( 'h22', ip='10.1.0.22/24', cls=dualStackHost, v6Addr='1000::22/64' )
+        LA03_host = self.addHost( 'h23', ip='10.1.0.23/24', cls=dualStackHost, v6Addr='1000::23/64' )
+        SNDG_host = self.addHost( 'h24', ip='10.1.0.24/24', cls=dualStackHost, v6Addr='1000::24/64' )
+        PHNX_host = self.addHost( 'h25', ip='10.1.0.25/24', cls=dualStackHost, v6Addr='1000::25/64' )
+
+        # add edges between switch and corresponding host
+        self.addLink( NY54 , NY54_host )
+        self.addLink( CMBR , CMBR_host )
+        self.addLink( CHCG , CHCG_host )
+        self.addLink( CLEV , CLEV_host )
+        self.addLink( RLGH , RLGH_host )
+        self.addLink( ATLN , ATLN_host )
+        self.addLink( PHLA , PHLA_host )
+        self.addLink( WASH , WASH_host )
+        self.addLink( NSVL , NSVL_host )
+        self.addLink( STLS , STLS_host )
+        self.addLink( NWOR , NWOR_host )
+        self.addLink( HSTN , HSTN_host )
+        self.addLink( SNAN , SNAN_host )
+        self.addLink( DLLS , DLLS_host )
+        self.addLink( ORLD , ORLD_host )
+        self.addLink( DNVR , DNVR_host )
+        self.addLink( KSCY , KSCY_host )
+        self.addLink( SNFN , SNFN_host )
+        self.addLink( SCRM , SCRM_host )
+        self.addLink( PTLD , PTLD_host )
+        self.addLink( STTL , STTL_host )
+        self.addLink( SLKC , SLKC_host )
+        self.addLink( LA03 , LA03_host )
+        self.addLink( SNDG , SNDG_host )
+        self.addLink( PHNX , PHNX_host )
+
+        # add edges between switches
+        self.addLink( NY54 , CMBR, bw=10, delay='0.979030824185ms')
+        self.addLink( NY54 , CHCG, bw=10, delay='0.806374975652ms')
+        self.addLink( NY54 , PHLA, bw=10, delay='0.686192970166ms')
+        self.addLink( NY54 , WASH, bw=10, delay='0.605826192092ms')
+        self.addLink( CMBR , PHLA, bw=10, delay='1.4018238197ms')
+        self.addLink( CHCG , CLEV, bw=10, delay='0.232315346482ms')
+        self.addLink( CHCG , PHLA, bw=10, delay='1.07297714274ms')
+        self.addLink( CHCG , STLS, bw=10, delay='1.12827896944ms')
+        self.addLink( CHCG , DNVR, bw=10, delay='1.35964770335ms')
+        self.addLink( CHCG , KSCY, bw=10, delay='1.5199778541ms')
+        self.addLink( CHCG , SNFN, bw=10, delay='0.620743405435ms')
+        self.addLink( CHCG , STTL, bw=10, delay='0.93027212534ms')
+        self.addLink( CHCG , SLKC, bw=10, delay='0.735621751348ms')
+        self.addLink( CLEV , NSVL, bw=10, delay='0.523419372248ms')
+        self.addLink( CLEV , STLS, bw=10, delay='1.00360290845ms')
+        self.addLink( CLEV , PHLA, bw=10, delay='0.882912133249ms')
+        self.addLink( RLGH , ATLN, bw=10, delay='1.1644489729ms')
+        self.addLink( RLGH , WASH, bw=10, delay='1.48176810502ms')
+        self.addLink( ATLN , WASH, bw=10, delay='0.557636936322ms')
+        self.addLink( ATLN , NSVL, bw=10, delay='1.32869749865ms')
+        self.addLink( ATLN , STLS, bw=10, delay='0.767705554748ms')
+        self.addLink( ATLN , DLLS, bw=10, delay='0.544782086448ms')
+        self.addLink( ATLN , ORLD, bw=10, delay='1.46119152532ms')
+        self.addLink( PHLA , WASH, bw=10, delay='0.372209320106ms')
+        self.addLink( NSVL , STLS, bw=10, delay='1.43250491305ms')
+        self.addLink( NSVL , DLLS, bw=10, delay='1.67698215288ms')
+        self.addLink( STLS , DLLS, bw=10, delay='0.256389964194ms')
+        self.addLink( STLS , KSCY, bw=10, delay='0.395511571791ms')
+        self.addLink( STLS , LA03, bw=10, delay='0.257085227363ms')
+        self.addLink( NWOR , HSTN, bw=10, delay='0.0952906633914ms')
+        self.addLink( NWOR , DLLS, bw=10, delay='1.60231329739ms')
+        self.addLink( NWOR , ORLD, bw=10, delay='0.692731063896ms')
+        self.addLink( HSTN , SNAN, bw=10, delay='0.284150653798ms')
+        self.addLink( HSTN , DLLS, bw=10, delay='1.65690128332ms')
+        self.addLink( HSTN , ORLD, bw=10, delay='0.731886304782ms')
+        self.addLink( SNAN , PHNX, bw=10, delay='1.34258627257ms')
+        self.addLink( SNAN , DLLS, bw=10, delay='1.50063532341ms')
+        self.addLink( DLLS , DNVR, bw=10, delay='0.251471593235ms')
+        self.addLink( DLLS , KSCY, bw=10, delay='0.18026026737ms')
+        self.addLink( DLLS , SNFN, bw=10, delay='0.74304274592ms')
+        self.addLink( DLLS , LA03, bw=10, delay='0.506439293357ms')
+        self.addLink( DNVR , KSCY, bw=10, delay='0.223328790403ms')
+        self.addLink( DNVR , SNFN, bw=10, delay='0.889017541903ms')
+        self.addLink( DNVR , SLKC, bw=10, delay='0.631898982721ms')
+        self.addLink( KSCY , SNFN, bw=10, delay='0.922778522233ms')
+        self.addLink( SNFN , SCRM, bw=10, delay='0.630352278097ms')
+        self.addLink( SNFN , PTLD, bw=10, delay='0.828572513655ms')
+        self.addLink( SNFN , STTL, bw=10, delay='1.54076081649ms')
+        self.addLink( SNFN , SLKC, bw=10, delay='0.621507502625ms')
+        self.addLink( SNFN , LA03, bw=10, delay='0.602936230151ms')
+        self.addLink( SCRM , SLKC, bw=10, delay='0.461350343644ms')
+        self.addLink( PTLD , STTL, bw=10, delay='1.17591515181ms')
+        self.addLink( SLKC , LA03, bw=10, delay='0.243225267023ms')
+        self.addLink( LA03 , SNDG, bw=10, delay='0.681264950821ms')
+        self.addLink( LA03 , PHNX, bw=10, delay='0.343709457969ms')
+        self.addLink( LA03 , PHNX, bw=10, delay='0.343709457969ms')
+        self.addLink( SNDG , PHNX, bw=10, delay='0.345064487693ms')
+
+topos = { 'att': ( lambda: attTopo() ) }
+
+# HERE THE CODE DEFINITION OF THE TOPOLOGY ENDS
+
+def setupNetwork():
+    "Create network"
+    topo = attTopo()
+    #if controller_ip == '':
+        #controller_ip = '10.0.2.2';
+    #    controller_ip = '127.0.0.1';
+    network = Mininet(topo=topo, link=TCLink, autoSetMacs=True, controller=None)
+    network.start()
+    CLI( network )
+    network.stop()
+
+if __name__ == '__main__':
+    setLogLevel('info')
+    #setLogLevel('debug')
+    setupNetwork()
diff --git a/TestON/tests/CHOtest/Dependencies/topoChordalIpv6.py b/TestON/tests/CHOtest/Dependencies/topoChordalIpv6.py
new file mode 100755
index 0000000..64b0405
--- /dev/null
+++ b/TestON/tests/CHOtest/Dependencies/topoChordalIpv6.py
@@ -0,0 +1,429 @@
+#!/usr/bin/python
+"""
+"""
+from mininet.topo import Topo
+from mininet.net import Mininet
+from mininet.node import Host, RemoteController
+from mininet.node import Node
+from mininet.node import CPULimitedHost
+from mininet.link import TCLink
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.util import dumpNodeConnections
+from mininet.node import ( UserSwitch, OVSSwitch, IVSSwitch )
+
+class dualStackHost( Host ):
+    def config( self, v6Addr='1000:1/64', **params ):
+        r = super( Host, self ).config( **params )
+        intf = self.defaultIntf()
+        self.cmd( 'ip -6 addr add %s dev %s' % ( v6Addr, intf ) )
+        return r
+
+class chordalTopo( Topo ):
+
+    def __init__( self, **opts ):
+        "Create a topology."
+
+        # Initialize Topology
+        Topo.__init__( self, **opts )
+
+        # add nodes, switches first...
+        s1 = self.addSwitch( 's1' )
+        s2 = self.addSwitch( 's2' )
+        s3 = self.addSwitch( 's3' )
+        s4 = self.addSwitch( 's4' )
+        s5 = self.addSwitch( 's5' )
+        s6 = self.addSwitch( 's6' )
+        s7 = self.addSwitch( 's7' )
+        s8 = self.addSwitch( 's8' )
+        s9 = self.addSwitch( 's9' )
+        s10 = self.addSwitch( 's10' )
+        s11 = self.addSwitch( 's11' )
+        s12 = self.addSwitch( 's12' )
+        s13 = self.addSwitch( 's13' )
+        s14 = self.addSwitch( 's14' )
+        s15 = self.addSwitch( 's15' )
+        s16 = self.addSwitch( 's16' )
+        s17 = self.addSwitch( 's17' )
+        s18 = self.addSwitch( 's18' )
+        s19 = self.addSwitch( 's19' )
+        s20 = self.addSwitch( 's20' )
+        s21 = self.addSwitch( 's21' )
+        s22 = self.addSwitch( 's22' )
+        s23 = self.addSwitch( 's23' )
+        s24 = self.addSwitch( 's24' )
+        s25 = self.addSwitch( 's25' )
+
+        # ... and now hosts
+        s1_host = self.addHost( 'h1', ip='10.1.0.1/24', cls=dualStackHost, v6Addr='1000::1/64' )
+        s2_host = self.addHost( 'h2', ip='10.1.0.2/24', cls=dualStackHost, v6Addr='1000::2/64' )
+        s3_host = self.addHost( 'h3', ip='10.1.0.3/24', cls=dualStackHost, v6Addr='1000::3/64' )
+        s4_host = self.addHost( 'h4', ip='10.1.0.4/24', cls=dualStackHost, v6Addr='1000::4/64' )
+        s5_host = self.addHost( 'h5', ip='10.1.0.5/24', cls=dualStackHost, v6Addr='1000::5/64' )
+        s6_host = self.addHost( 'h6', ip='10.1.0.6/24', cls=dualStackHost, v6Addr='1000::6/64' )
+        s7_host = self.addHost( 'h7', ip='10.1.0.7/24', cls=dualStackHost, v6Addr='1000::7/64' )
+        s8_host = self.addHost( 'h8', ip='10.1.0.8/24', cls=dualStackHost, v6Addr='1000::8/64' )
+        s9_host = self.addHost( 'h9', ip='10.1.0.9/24', cls=dualStackHost, v6Addr='1000::9/64' )
+        s10_host = self.addHost( 'h10', ip='10.1.0.10/24', cls=dualStackHost, v6Addr='1000::10/64' )
+        s11_host = self.addHost( 'h11', ip='10.1.0.11/24', cls=dualStackHost, v6Addr='1000::11/64' )
+        s12_host = self.addHost( 'h12', ip='10.1.0.12/24', cls=dualStackHost, v6Addr='1000::12/64' )
+        s13_host = self.addHost( 'h13', ip='10.1.0.13/24', cls=dualStackHost, v6Addr='1000::13/64' )
+        s14_host = self.addHost( 'h14', ip='10.1.0.14/24', cls=dualStackHost, v6Addr='1000::14/64' )
+        s15_host = self.addHost( 'h15', ip='10.1.0.15/24', cls=dualStackHost, v6Addr='1000::15/64' )
+        s16_host = self.addHost( 'h16', ip='10.1.0.16/24', cls=dualStackHost, v6Addr='1000::16/64' )
+        s17_host = self.addHost( 'h17', ip='10.1.0.17/24', cls=dualStackHost, v6Addr='1000::17/64' )
+        s18_host = self.addHost( 'h18', ip='10.1.0.18/24', cls=dualStackHost, v6Addr='1000::18/64' )
+        s19_host = self.addHost( 'h19', ip='10.1.0.19/24', cls=dualStackHost, v6Addr='1000::19/64' )
+        s20_host = self.addHost( 'h20', ip='10.1.0.20/24', cls=dualStackHost, v6Addr='1000::20/64' )
+        s21_host = self.addHost( 'h21', ip='10.1.0.21/24', cls=dualStackHost, v6Addr='1000::21/64' )
+        s22_host = self.addHost( 'h22', ip='10.1.0.22/24', cls=dualStackHost, v6Addr='1000::22/64' )
+        s23_host = self.addHost( 'h23', ip='10.1.0.23/24', cls=dualStackHost, v6Addr='1000::23/64' )
+        s24_host = self.addHost( 'h24', ip='10.1.0.24/24', cls=dualStackHost, v6Addr='1000::24/64' )
+        s25_host = self.addHost( 'h25', ip='10.1.0.25/24', cls=dualStackHost, v6Addr='1000::25/64' )
+
+        # add edges between switch and corresponding host
+        self.addLink( s1 , s1_host )
+        self.addLink( s2 , s2_host )
+        self.addLink( s3 , s3_host )
+        self.addLink( s4 , s4_host )
+        self.addLink( s5 , s5_host )
+        self.addLink( s6 , s6_host )
+        self.addLink( s7 , s7_host )
+        self.addLink( s8 , s8_host )
+        self.addLink( s9 , s9_host )
+        self.addLink( s10 , s10_host )
+        self.addLink( s11 , s11_host )
+        self.addLink( s12 , s12_host )
+        self.addLink( s13 , s13_host )
+        self.addLink( s14 , s14_host )
+        self.addLink( s15 , s15_host )
+        self.addLink( s16 , s16_host )
+        self.addLink( s17 , s17_host )
+        self.addLink( s18 , s18_host )
+        self.addLink( s19 , s19_host )
+        self.addLink( s20 , s20_host )
+        self.addLink( s21 , s21_host )
+        self.addLink( s22 , s22_host )
+        self.addLink( s23 , s23_host )
+        self.addLink( s24 , s24_host )
+        self.addLink( s25 , s25_host )
+        self.addLink(s1, s2)
+        self.addLink(s1, s3)
+        self.addLink(s1, s4)
+        self.addLink(s1, s5)
+        self.addLink(s1, s6)
+        self.addLink(s1, s7)
+        self.addLink(s1, s8)
+        self.addLink(s1, s9)
+        self.addLink(s1, s10)
+        self.addLink(s1, s11)
+        self.addLink(s1, s12)
+        self.addLink(s1, s13)
+        self.addLink(s1, s14)
+        self.addLink(s1, s15)
+        self.addLink(s1, s16)
+        self.addLink(s1, s17)
+        self.addLink(s1, s18)
+        self.addLink(s1, s19)
+        self.addLink(s1, s20)
+        self.addLink(s1, s21)
+        self.addLink(s1, s22)
+        self.addLink(s1, s23)
+        self.addLink(s1, s24)
+        self.addLink(s1, s25)
+        self.addLink(s2, s3)
+        self.addLink(s2, s4)
+        self.addLink(s2, s5)
+        self.addLink(s2, s6)
+        self.addLink(s2, s7)
+        self.addLink(s2, s8)
+        self.addLink(s2, s9)
+        self.addLink(s2, s10)
+        self.addLink(s2, s11)
+        self.addLink(s2, s12)
+        self.addLink(s2, s13)
+        self.addLink(s2, s14)
+        self.addLink(s2, s15)
+        self.addLink(s2, s16)
+        self.addLink(s2, s17)
+        self.addLink(s2, s18)
+        self.addLink(s2, s19)
+        self.addLink(s2, s20)
+        self.addLink(s2, s21)
+        self.addLink(s2, s22)
+        self.addLink(s2, s23)
+        self.addLink(s2, s24)
+        self.addLink(s2, s25)
+        self.addLink(s3, s4)
+        self.addLink(s3, s5)
+        self.addLink(s3, s6)
+        self.addLink(s3, s7)
+        self.addLink(s3, s8)
+        self.addLink(s3, s9)
+        self.addLink(s3, s10)
+        self.addLink(s3, s11)
+        self.addLink(s3, s12)
+        self.addLink(s3, s13)
+        self.addLink(s3, s14)
+        self.addLink(s3, s15)
+        self.addLink(s3, s16)
+        self.addLink(s3, s17)
+        self.addLink(s3, s18)
+        self.addLink(s3, s19)
+        self.addLink(s3, s20)
+        self.addLink(s3, s21)
+        self.addLink(s3, s22)
+        self.addLink(s3, s23)
+        self.addLink(s3, s24)
+        self.addLink(s3, s25)
+        self.addLink(s4, s5)
+        self.addLink(s4, s6)
+        self.addLink(s4, s7)
+        self.addLink(s4, s8)
+        self.addLink(s4, s9)
+        self.addLink(s4, s10)
+        self.addLink(s4, s11)
+        self.addLink(s4, s12)
+        self.addLink(s4, s13)
+        self.addLink(s4, s14)
+        self.addLink(s4, s15)
+        self.addLink(s4, s16)
+        self.addLink(s4, s17)
+        self.addLink(s4, s18)
+        self.addLink(s4, s19)
+        self.addLink(s4, s20)
+        self.addLink(s4, s21)
+        self.addLink(s4, s22)
+        self.addLink(s4, s23)
+        self.addLink(s4, s24)
+        self.addLink(s4, s25)
+        self.addLink(s5, s6)
+        self.addLink(s5, s7)
+        self.addLink(s5, s8)
+        self.addLink(s5, s9)
+        self.addLink(s5, s10)
+        self.addLink(s5, s11)
+        self.addLink(s5, s12)
+        self.addLink(s5, s13)
+        self.addLink(s5, s14)
+        self.addLink(s5, s15)
+        self.addLink(s5, s16)
+        self.addLink(s5, s17)
+        self.addLink(s5, s18)
+        self.addLink(s5, s19)
+        self.addLink(s5, s20)
+        self.addLink(s5, s21)
+        self.addLink(s5, s22)
+        self.addLink(s5, s23)
+        self.addLink(s5, s24)
+        self.addLink(s5, s25)
+        self.addLink(s6, s7)
+        self.addLink(s6, s8)
+        self.addLink(s6, s9)
+        self.addLink(s6, s10)
+        self.addLink(s6, s11)
+        self.addLink(s6, s12)
+        self.addLink(s6, s13)
+        self.addLink(s6, s14)
+        self.addLink(s6, s15)
+        self.addLink(s6, s16)
+        self.addLink(s6, s17)
+        self.addLink(s6, s18)
+        self.addLink(s6, s19)
+        self.addLink(s6, s20)
+        self.addLink(s6, s21)
+        self.addLink(s6, s22)
+        self.addLink(s6, s23)
+        self.addLink(s6, s24)
+        self.addLink(s6, s25)
+        self.addLink(s7, s8)
+        self.addLink(s7, s9)
+        self.addLink(s7, s10)
+        self.addLink(s7, s11)
+        self.addLink(s7, s12)
+        self.addLink(s7, s13)
+        self.addLink(s7, s14)
+        self.addLink(s7, s15)
+        self.addLink(s7, s16)
+        self.addLink(s7, s17)
+        self.addLink(s7, s18)
+        self.addLink(s7, s19)
+        self.addLink(s7, s20)
+        self.addLink(s7, s21)
+        self.addLink(s7, s22)
+        self.addLink(s7, s23)
+        self.addLink(s7, s24)
+        self.addLink(s7, s25)
+        self.addLink(s8, s9)
+        self.addLink(s8, s10)
+        self.addLink(s8, s11)
+        self.addLink(s8, s12)
+        self.addLink(s8, s13)
+        self.addLink(s8, s14)
+        self.addLink(s8, s15)
+        self.addLink(s8, s16)
+        self.addLink(s8, s17)
+        self.addLink(s8, s18)
+        self.addLink(s8, s19)
+        self.addLink(s8, s20)
+        self.addLink(s8, s21)
+        self.addLink(s8, s22)
+        self.addLink(s8, s23)
+        self.addLink(s8, s24)
+        self.addLink(s8, s25)
+        self.addLink(s9, s10)
+        self.addLink(s9, s11)
+        self.addLink(s9, s12)
+        self.addLink(s9, s13)
+        self.addLink(s9, s14)
+        self.addLink(s9, s15)
+        self.addLink(s9, s16)
+        self.addLink(s9, s17)
+        self.addLink(s9, s18)
+        self.addLink(s9, s19)
+        self.addLink(s9, s20)
+        self.addLink(s9, s21)
+        self.addLink(s9, s22)
+        self.addLink(s9, s23)
+        self.addLink(s9, s24)
+        self.addLink(s9, s25)
+        self.addLink(s10, s11)
+        self.addLink(s10, s12)
+        self.addLink(s10, s13)
+        self.addLink(s10, s14)
+        self.addLink(s10, s15)
+        self.addLink(s10, s16)
+        self.addLink(s10, s17)
+        self.addLink(s10, s18)
+        self.addLink(s10, s19)
+        self.addLink(s10, s20)
+        self.addLink(s10, s21)
+        self.addLink(s10, s22)
+        self.addLink(s10, s23)
+        self.addLink(s10, s24)
+        self.addLink(s10, s25)
+        self.addLink(s11, s12)
+        self.addLink(s11, s13)
+        self.addLink(s11, s14)
+        self.addLink(s11, s15)
+        self.addLink(s11, s16)
+        self.addLink(s11, s17)
+        self.addLink(s11, s18)
+        self.addLink(s11, s19)
+        self.addLink(s11, s20)
+        self.addLink(s11, s21)
+        self.addLink(s11, s22)
+        self.addLink(s11, s23)
+        self.addLink(s11, s24)
+        self.addLink(s11, s25)
+        self.addLink(s12, s13)
+        self.addLink(s12, s14)
+        self.addLink(s12, s15)
+        self.addLink(s12, s16)
+        self.addLink(s12, s17)
+        self.addLink(s12, s18)
+        self.addLink(s12, s19)
+        self.addLink(s12, s20)
+        self.addLink(s12, s21)
+        self.addLink(s12, s22)
+        self.addLink(s12, s23)
+        self.addLink(s12, s24)
+        self.addLink(s12, s25)
+        self.addLink(s13, s14)
+        self.addLink(s13, s15)
+        self.addLink(s13, s16)
+        self.addLink(s13, s17)
+        self.addLink(s13, s18)
+        self.addLink(s13, s19)
+        self.addLink(s13, s20)
+        self.addLink(s13, s21)
+        self.addLink(s13, s22)
+        self.addLink(s13, s23)
+        self.addLink(s13, s24)
+        self.addLink(s13, s25)
+        self.addLink(s14, s15)
+        self.addLink(s14, s16)
+        self.addLink(s14, s17)
+        self.addLink(s14, s18)
+        self.addLink(s14, s19)
+        self.addLink(s14, s20)
+        self.addLink(s14, s21)
+        self.addLink(s14, s22)
+        self.addLink(s14, s23)
+        self.addLink(s14, s24)
+        self.addLink(s14, s25)
+        self.addLink(s15, s16)
+        self.addLink(s15, s17)
+        self.addLink(s15, s18)
+        self.addLink(s15, s19)
+        self.addLink(s15, s20)
+        self.addLink(s15, s21)
+        self.addLink(s15, s22)
+        self.addLink(s15, s23)
+        self.addLink(s15, s24)
+        self.addLink(s15, s25)
+        self.addLink(s16, s17)
+        self.addLink(s16, s18)
+        self.addLink(s16, s19)
+        self.addLink(s16, s20)
+        self.addLink(s16, s21)
+        self.addLink(s16, s22)
+        self.addLink(s16, s23)
+        self.addLink(s16, s24)
+        self.addLink(s16, s25)
+        self.addLink(s17, s18)
+        self.addLink(s17, s19)
+        self.addLink(s17, s20)
+        self.addLink(s17, s21)
+        self.addLink(s17, s22)
+        self.addLink(s17, s23)
+        self.addLink(s17, s24)
+        self.addLink(s17, s25)
+        self.addLink(s18, s19)
+        self.addLink(s18, s20)
+        self.addLink(s18, s21)
+        self.addLink(s18, s22)
+        self.addLink(s18, s23)
+        self.addLink(s18, s24)
+        self.addLink(s18, s25)
+        self.addLink(s19, s20)
+        self.addLink(s19, s21)
+        self.addLink(s19, s22)
+        self.addLink(s19, s23)
+        self.addLink(s19, s24)
+        self.addLink(s19, s25)
+        self.addLink(s20, s21)
+        self.addLink(s20, s22)
+        self.addLink(s20, s23)
+        self.addLink(s20, s24)
+        self.addLink(s20, s25)
+        self.addLink(s21, s22)
+        self.addLink(s21, s23)
+        self.addLink(s21, s24)
+        self.addLink(s21, s25)
+        self.addLink(s22, s23)
+        self.addLink(s22, s24)
+        self.addLink(s22, s25)
+        self.addLink(s23, s24)
+        self.addLink(s23, s25)
+        self.addLink(s24, s25)
+
+topos = { 'chordal': ( lambda: chordalTopo() ) }
+
+# HERE THE CODE DEFINITION OF THE TOPOLOGY ENDS
+
+def setupNetwork():
+    "Create network"
+    topo = chordalTopo()
+    #if controller_ip == '':
+        #controller_ip = '10.0.2.2';
+    #    controller_ip = '127.0.0.1';
+    network = Mininet(topo=topo, switch=OVSSwitch,autoSetMacs=True, controller=None)
+    network.start()
+    CLI( network )
+    network.stop()
+
+if __name__ == '__main__':
+    setLogLevel('info')
+    #setLogLevel('debug')
+    setupNetwork()
diff --git a/TestON/tests/CHOtest/Dependencies/topoSpineIpv6.py b/TestON/tests/CHOtest/Dependencies/topoSpineIpv6.py
new file mode 100755
index 0000000..689adb3
--- /dev/null
+++ b/TestON/tests/CHOtest/Dependencies/topoSpineIpv6.py
@@ -0,0 +1,440 @@
+#!/usr/bin/python
+from mininet.topo import Topo
+from mininet.net import Mininet
+from mininet.node import Host, RemoteController
+from mininet.node import Node
+from mininet.node import CPULimitedHost
+from mininet.link import TCLink
+from mininet.cli import CLI
+from mininet.log import setLogLevel
+from mininet.util import dumpNodeConnections
+from mininet.node import ( UserSwitch, OVSSwitch, IVSSwitch )
+
+class dualStackHost( Host ):
+    def config( self, v6Addr='1000:1/64', **params ):
+        r = super( Host, self ).config( **params )
+        intf = self.defaultIntf()
+        self.cmd( 'ip -6 addr add %s dev %s' % ( v6Addr, intf ) )
+        return r
+
+class spineTopo( Topo ):
+
+    def __init__( self, **opts ):
+        "Create a topology."
+
+        # Initialize Topology
+        Topo.__init__( self, **opts )
+
+        # add nodes, Leaf switches
+        s1 = self.addSwitch( 's1' )
+        s2 = self.addSwitch( 's2' )
+        s3 = self.addSwitch( 's3' )
+        s4 = self.addSwitch( 's4' )
+        s5 = self.addSwitch( 's5' )
+        s6 = self.addSwitch( 's6' )
+        s7 = self.addSwitch( 's7' )
+        s8 = self.addSwitch( 's8' )
+        s9 = self.addSwitch( 's9' )
+        s10 = self.addSwitch( 's10' )
+        s11 = self.addSwitch( 's11' )
+        s12 = self.addSwitch( 's12' )
+        s13 = self.addSwitch( 's13' )
+        s14 = self.addSwitch( 's14' )
+
+        # add nodes, Spine switches first...
+        s15 = self.addSwitch( 's15' )
+        s16 = self.addSwitch( 's16' )
+        s17 = self.addSwitch( 's17' )
+        s18 = self.addSwitch( 's18' )
+        s19 = self.addSwitch( 's19' )
+        s20 = self.addSwitch( 's20' )
+        s21 = self.addSwitch( 's21' )
+        s22 = self.addSwitch( 's22' )
+        s23 = self.addSwitch( 's23' )
+        s24 = self.addSwitch( 's24' )
+        s25 = self.addSwitch( 's25' )
+        s26 = self.addSwitch( 's26' )
+        s27 = self.addSwitch( 's27' )
+        s28 = self.addSwitch( 's28' )
+        s29 = self.addSwitch( 's29' )
+        s30 = self.addSwitch( 's30' )
+        s31 = self.addSwitch( 's31' )
+        s32 = self.addSwitch( 's32' )
+        s33 = self.addSwitch( 's33' )
+        s34 = self.addSwitch( 's34' )
+        s35 = self.addSwitch( 's35' )
+        s36 = self.addSwitch( 's36' )
+        s37 = self.addSwitch( 's37' )
+        s38 = self.addSwitch( 's38' )
+        s39 = self.addSwitch( 's39' )
+        s40 = self.addSwitch( 's40' )
+        s41 = self.addSwitch( 's41' )
+        s42 = self.addSwitch( 's42' )
+        s43 = self.addSwitch( 's43' )
+        s44 = self.addSwitch( 's44' )
+        s45 = self.addSwitch( 's45' )
+        s46 = self.addSwitch( 's46' )
+        s47 = self.addSwitch( 's47' )
+        s48 = self.addSwitch( 's48' )
+        s49 = self.addSwitch( 's49' )
+        s50 = self.addSwitch( 's50' )
+        s51 = self.addSwitch( 's51' )
+        s52 = self.addSwitch( 's52' )
+        s53 = self.addSwitch( 's53' )
+        s54 = self.addSwitch( 's54' )
+        s55 = self.addSwitch( 's55' )
+        s56 = self.addSwitch( 's56' )
+        s57 = self.addSwitch( 's57' )
+        s58 = self.addSwitch( 's58' )
+        s59 = self.addSwitch( 's59' )
+        s60 = self.addSwitch( 's60' )
+        s61 = self.addSwitch( 's61' )
+        s62 = self.addSwitch( 's62' )
+        s63 = self.addSwitch( 's63' )
+        s64 = self.addSwitch( 's64' )
+        s65 = self.addSwitch( 's65' )
+        s66 = self.addSwitch( 's66' )
+        s67 = self.addSwitch( 's67' )
+        s68 = self.addSwitch( 's68' )
+        s69 = self.addSwitch( 's69' )
+        s70 = self.addSwitch( 's70' )
+        s71 = self.addSwitch( 's71' )
+        s72 = self.addSwitch( 's72' )
+        s73 = self.addSwitch( 's73' )
+        s74 = self.addSwitch( 's74' )
+        s75 = self.addSwitch( 's75' )
+        s76 = self.addSwitch( 's76' )
+        s77 = self.addSwitch( 's77' )
+        s78 = self.addSwitch( 's78' )
+
+        # ... and now hosts
+        # s1_host = self.addHost( 'h1', ip='10.1.0.1/24', cls=dualStackHost, v6Addr='1000::1/64' )
+        # s2_host = self.addHost( 'h2', ip='10.1.0.2/24', cls=dualStackHost, v6Addr='1000::2/64' )
+        # s3_host = self.addHost( 'h3', ip='10.1.0.3/24', cls=dualStackHost, v6Addr='1000::3/64' )
+        # s4_host = self.addHost( 'h4', ip='10.1.0.4/24', cls=dualStackHost, v6Addr='1000::4/64' )
+        # s5_host = self.addHost( 'h5', ip='10.1.0.5/24', cls=dualStackHost, v6Addr='1000::5/64' )
+        # s6_host = self.addHost( 'h6', ip='10.1.0.6/24', cls=dualStackHost, v6Addr='1000::6/64' )
+        # s7_host = self.addHost( 'h7', ip='10.1.0.7/24', cls=dualStackHost, v6Addr='1000::7/64' )
+        # s8_host = self.addHost( 'h8', ip='10.1.0.8/24', cls=dualStackHost, v6Addr='1000::8/64' )
+        # s9_host = self.addHost( 'h9', ip='10.1.0.9/24', cls=dualStackHost, v6Addr='1000::9/64' )
+        # s10_host = self.addHost( 'h10', ip='10.1.0.10/24', cls=dualStackHost, v6Addr='1000::10/64' )
+        s11_host = self.addHost( 'h11', ip='10.1.0.11/24', cls=dualStackHost, v6Addr='1000::11/64' )
+        s12_host = self.addHost( 'h12', ip='10.1.0.12/24', cls=dualStackHost, v6Addr='1000::12/64' )
+        s13_host = self.addHost( 'h13', ip='10.1.0.13/24', cls=dualStackHost, v6Addr='1000::13/64' )
+        s14_host = self.addHost( 'h14', ip='10.1.0.14/24', cls=dualStackHost, v6Addr='1000::14/64' )
+        s15_host = self.addHost( 'h15', ip='10.1.0.15/24', cls=dualStackHost, v6Addr='1000::15/64' )
+        s16_host = self.addHost( 'h16', ip='10.1.0.16/24', cls=dualStackHost, v6Addr='1000::16/64' )
+        s17_host = self.addHost( 'h17', ip='10.1.0.17/24', cls=dualStackHost, v6Addr='1000::17/64' )
+        s18_host = self.addHost( 'h18', ip='10.1.0.18/24', cls=dualStackHost, v6Addr='1000::18/64' )
+        s19_host = self.addHost( 'h19', ip='10.1.0.19/24', cls=dualStackHost, v6Addr='1000::19/64' )
+        s20_host = self.addHost( 'h20', ip='10.1.0.20/24', cls=dualStackHost, v6Addr='1000::20/64' )
+        s21_host = self.addHost( 'h21', ip='10.1.0.21/24', cls=dualStackHost, v6Addr='1000::21/64' )
+        s22_host = self.addHost( 'h22', ip='10.1.0.22/24', cls=dualStackHost, v6Addr='1000::22/64' )
+        s23_host = self.addHost( 'h23', ip='10.1.0.23/24', cls=dualStackHost, v6Addr='1000::23/64' )
+        s24_host = self.addHost( 'h24', ip='10.1.0.24/24', cls=dualStackHost, v6Addr='1000::24/64' )
+        s25_host = self.addHost( 'h25', ip='10.1.0.25/24', cls=dualStackHost, v6Addr='1000::25/64' )
+        s26_host = self.addHost( 'h26', ip='10.1.0.26/24', cls=dualStackHost, v6Addr='1000::26/64' )
+        s27_host = self.addHost( 'h27', ip='10.1.0.27/24', cls=dualStackHost, v6Addr='1000::27/64' )
+        s28_host = self.addHost( 'h28', ip='10.1.0.28/24', cls=dualStackHost, v6Addr='1000::28/64' )
+        s29_host = self.addHost( 'h29', ip='10.1.0.29/24', cls=dualStackHost, v6Addr='1000::29/64' )
+        s30_host = self.addHost( 'h30', ip='10.1.0.30/24', cls=dualStackHost, v6Addr='1000::30/64' )
+        s31_host = self.addHost( 'h31', ip='10.1.0.31/24', cls=dualStackHost, v6Addr='1000::31/64' )
+        s32_host = self.addHost( 'h32', ip='10.1.0.32/24', cls=dualStackHost, v6Addr='1000::32/64' )
+        s33_host = self.addHost( 'h33', ip='10.1.0.33/24', cls=dualStackHost, v6Addr='1000::33/64' )
+        s34_host = self.addHost( 'h34', ip='10.1.0.34/24', cls=dualStackHost, v6Addr='1000::34/64' )
+        s35_host = self.addHost( 'h35', ip='10.1.0.35/24', cls=dualStackHost, v6Addr='1000::35/64' )
+        s36_host = self.addHost( 'h36', ip='10.1.0.36/24', cls=dualStackHost, v6Addr='1000::36/64' )
+        s37_host = self.addHost( 'h37', ip='10.1.0.37/24', cls=dualStackHost, v6Addr='1000::37/64' )
+        s38_host = self.addHost( 'h38', ip='10.1.0.38/24', cls=dualStackHost, v6Addr='1000::38/64' )
+        s39_host = self.addHost( 'h39', ip='10.1.0.39/24', cls=dualStackHost, v6Addr='1000::39/64' )
+        s40_host = self.addHost( 'h40', ip='10.1.0.40/24', cls=dualStackHost, v6Addr='1000::40/64' )
+        s41_host = self.addHost( 'h41', ip='10.1.0.41/24', cls=dualStackHost, v6Addr='1000::41/64' )
+        s42_host = self.addHost( 'h42', ip='10.1.0.42/24', cls=dualStackHost, v6Addr='1000::42/64' )
+        s43_host = self.addHost( 'h43', ip='10.1.0.43/24', cls=dualStackHost, v6Addr='1000::43/64' )
+        s44_host = self.addHost( 'h44', ip='10.1.0.44/24', cls=dualStackHost, v6Addr='1000::44/64' )
+        s45_host = self.addHost( 'h45', ip='10.1.0.45/24', cls=dualStackHost, v6Addr='1000::45/64' )
+        s46_host = self.addHost( 'h46', ip='10.1.0.46/24', cls=dualStackHost, v6Addr='1000::46/64' )
+        s47_host = self.addHost( 'h47', ip='10.1.0.47/24', cls=dualStackHost, v6Addr='1000::47/64' )
+        s48_host = self.addHost( 'h48', ip='10.1.0.48/24', cls=dualStackHost, v6Addr='1000::48/64' )
+        s49_host = self.addHost( 'h49', ip='10.1.0.49/24', cls=dualStackHost, v6Addr='1000::49/64' )
+        s50_host = self.addHost( 'h50', ip='10.1.0.50/24', cls=dualStackHost, v6Addr='1000::50/64' )
+        s51_host = self.addHost( 'h51', ip='10.1.0.51/24', cls=dualStackHost, v6Addr='1000::51/64' )
+        s52_host = self.addHost( 'h52', ip='10.1.0.52/24', cls=dualStackHost, v6Addr='1000::52/64' )
+        s53_host = self.addHost( 'h53', ip='10.1.0.53/24', cls=dualStackHost, v6Addr='1000::53/64' )
+        s54_host = self.addHost( 'h54', ip='10.1.0.54/24', cls=dualStackHost, v6Addr='1000::54/64' )
+        s55_host = self.addHost( 'h55', ip='10.1.0.55/24', cls=dualStackHost, v6Addr='1000::55/64' )
+        s56_host = self.addHost( 'h56', ip='10.1.0.56/24', cls=dualStackHost, v6Addr='1000::56/64' )
+        s57_host = self.addHost( 'h57', ip='10.1.0.57/24', cls=dualStackHost, v6Addr='1000::57/64' )
+        s58_host = self.addHost( 'h58', ip='10.1.0.58/24', cls=dualStackHost, v6Addr='1000::58/64' )
+        s59_host = self.addHost( 'h59', ip='10.1.0.59/24', cls=dualStackHost, v6Addr='1000::59/64' )
+        s60_host = self.addHost( 'h60', ip='10.1.0.60/24', cls=dualStackHost, v6Addr='1000::60/64' )
+        s61_host = self.addHost( 'h61', ip='10.1.0.61/24', cls=dualStackHost, v6Addr='1000::61/64' )
+        s62_host = self.addHost( 'h62', ip='10.1.0.62/24', cls=dualStackHost, v6Addr='1000::62/64' )
+        s63_host = self.addHost( 'h63', ip='10.1.0.63/24', cls=dualStackHost, v6Addr='1000::63/64' )
+        s64_host = self.addHost( 'h64', ip='10.1.0.64/24', cls=dualStackHost, v6Addr='1000::64/64' )
+        s65_host = self.addHost( 'h65', ip='10.1.0.65/24', cls=dualStackHost, v6Addr='1000::65/64' )
+        s66_host = self.addHost( 'h66', ip='10.1.0.66/24', cls=dualStackHost, v6Addr='1000::66/64' )
+        s67_host = self.addHost( 'h67', ip='10.1.0.67/24', cls=dualStackHost, v6Addr='1000::67/64' )
+        s68_host = self.addHost( 'h68', ip='10.1.0.68/24', cls=dualStackHost, v6Addr='1000::68/64' )
+        s69_host = self.addHost( 'h69', ip='10.1.0.69/24', cls=dualStackHost, v6Addr='1000::69/64' )
+        s70_host = self.addHost( 'h70', ip='10.1.0.70/24', cls=dualStackHost, v6Addr='1000::70/64' )
+        s71_host = self.addHost( 'h71', ip='10.1.0.71/24', cls=dualStackHost, v6Addr='1000::71/64' )
+        s72_host = self.addHost( 'h72', ip='10.1.0.72/24', cls=dualStackHost, v6Addr='1000::72/64' )
+        s73_host = self.addHost( 'h73', ip='10.1.0.73/24', cls=dualStackHost, v6Addr='1000::73/64' )
+        s74_host = self.addHost( 'h74', ip='10.1.0.74/24', cls=dualStackHost, v6Addr='1000::74/64' )
+        s75_host = self.addHost( 'h75', ip='10.1.0.75/24', cls=dualStackHost, v6Addr='1000::75/64' )
+        s76_host = self.addHost( 'h76', ip='10.1.0.76/24', cls=dualStackHost, v6Addr='1000::76/64' )
+        s77_host = self.addHost( 'h77', ip='10.1.0.77/24', cls=dualStackHost, v6Addr='1000::77/64' )
+        s78_host = self.addHost( 'h78', ip='10.1.0.78/24', cls=dualStackHost, v6Addr='1000::78/64' )
+
+        # add edges between switch and corresponding host
+        #self.addLink( s1 , s1_host )
+        #self.addLink( s2 , s2_host )
+        #self.addLink( s3 , s3_host )
+        #self.addLink( s4 , s4_host )
+        #self.addLink( s5 , s5_host )
+        #self.addLink( s6 , s6_host )
+        #self.addLink( s7 , s7_host )
+        #self.addLink( s8 , s8_host )
+        #self.addLink( s9 , s9_host )
+        #self.addLink( s10 , s10_host )
+        self.addLink( s11 , s11_host )
+        self.addLink( s12 , s12_host )
+        self.addLink( s13 , s13_host )
+        self.addLink( s14 , s14_host )
+        self.addLink( s15 , s15_host )
+        self.addLink( s16 , s16_host )
+        self.addLink( s17 , s17_host )
+        self.addLink( s18 , s18_host )
+        self.addLink( s19 , s19_host )
+        self.addLink( s20 , s20_host )
+        self.addLink( s21 , s21_host )
+        self.addLink( s22 , s22_host )
+        self.addLink( s23 , s23_host )
+        self.addLink( s24 , s24_host )
+        self.addLink( s25 , s25_host )
+        self.addLink( s26 , s26_host )
+        self.addLink( s27 , s27_host )
+        self.addLink( s28 , s28_host )
+        self.addLink( s29 , s29_host )
+        self.addLink( s30 , s30_host )
+        self.addLink( s31 , s31_host )
+        self.addLink( s32 , s32_host )
+        self.addLink( s33 , s33_host )
+        self.addLink( s34 , s34_host )
+        self.addLink( s35 , s35_host )
+        self.addLink( s36 , s36_host )
+        self.addLink( s37 , s37_host )
+        self.addLink( s38 , s38_host )
+        self.addLink( s39 , s39_host )
+        self.addLink( s40 , s40_host )
+        self.addLink( s41 , s41_host )
+        self.addLink( s42 , s42_host )
+        self.addLink( s43 , s43_host )
+        self.addLink( s44 , s44_host )
+        self.addLink( s45 , s45_host )
+        self.addLink( s46 , s46_host )
+        self.addLink( s47 , s47_host )
+        self.addLink( s48 , s48_host )
+        self.addLink( s49 , s49_host )
+        self.addLink( s50 , s50_host )
+        self.addLink( s51 , s51_host )
+        self.addLink( s52 , s52_host )
+        self.addLink( s53 , s53_host )
+        self.addLink( s54 , s54_host )
+        self.addLink( s55 , s55_host )
+        self.addLink( s56 , s56_host )
+        self.addLink( s57 , s57_host )
+        self.addLink( s58 , s58_host )
+        self.addLink( s59 , s59_host )
+        self.addLink( s60 , s60_host )
+        self.addLink( s61 , s61_host )
+        self.addLink( s62 , s62_host )
+        self.addLink( s63 , s63_host )
+        self.addLink( s64 , s64_host )
+        self.addLink( s65 , s65_host )
+        self.addLink( s66 , s66_host )
+        self.addLink( s67 , s67_host )
+        self.addLink( s68 , s68_host )
+        self.addLink( s69 , s69_host )
+        self.addLink( s70 , s70_host )
+        self.addLink( s71 , s71_host )
+        self.addLink( s72 , s72_host )
+        self.addLink( s73 , s73_host )
+        self.addLink( s74 , s74_host )
+        self.addLink( s75 , s75_host )
+        self.addLink( s76 , s76_host )
+        self.addLink( s77 , s77_host )
+        self.addLink( s78 , s78_host )
+
+        #info( '*** Add Leaf links\n')
+        self.addLink(s1, s9)
+        self.addLink(s2, s10)
+        self.addLink(s3, s9)
+        self.addLink(s4, s10)
+        self.addLink(s5, s9)
+        self.addLink(s6, s10)
+        self.addLink(s7, s9)
+        self.addLink(s8, s10)
+        self.addLink(s9, s11)
+        self.addLink(s9, s12)
+        self.addLink(s10, s13)
+        self.addLink(s10, s14)
+        self.addLink(s11, s12)
+        self.addLink(s13, s14)
+
+        #info( '*** Add Spine-1 links\n')
+        self.addLink(s15, s1)
+        self.addLink(s15, s2)
+        self.addLink(s16, s1)
+        self.addLink(s16, s2)
+        self.addLink(s17, s1)
+        self.addLink(s17, s2)
+        self.addLink(s18, s1)
+        self.addLink(s18, s2)
+        self.addLink(s19, s1)
+        self.addLink(s19, s2)
+        self.addLink(s20, s1)
+        self.addLink(s20, s2)
+        self.addLink(s21, s1)
+        self.addLink(s21, s2)
+        self.addLink(s22, s1)
+        self.addLink(s22, s2)
+        self.addLink(s23, s1)
+        self.addLink(s23, s2)
+        self.addLink(s24, s1)
+        self.addLink(s24, s2)
+        self.addLink(s25, s1)
+        self.addLink(s25, s2)
+        self.addLink(s26, s1)
+        self.addLink(s26, s2)
+        self.addLink(s27, s1)
+        self.addLink(s27, s2)
+        self.addLink(s28, s1)
+        self.addLink(s28, s2)
+        self.addLink(s29, s1)
+        self.addLink(s29, s2)
+        self.addLink(s30, s1)
+        self.addLink(s30, s2)
+
+        #info( '*** Add Spine-2 links\n')
+        self.addLink(s31, s3)
+        self.addLink(s31, s4)
+        self.addLink(s32, s3)
+        self.addLink(s32, s4)
+        self.addLink(s33, s3)
+        self.addLink(s33, s4)
+        self.addLink(s34, s3)
+        self.addLink(s34, s4)
+        self.addLink(s35, s3)
+        self.addLink(s35, s4)
+        self.addLink(s36, s3)
+        self.addLink(s36, s4)
+        self.addLink(s37, s3)
+        self.addLink(s37, s4)
+        self.addLink(s38, s3)
+        self.addLink(s38, s4)
+        self.addLink(s39, s3)
+        self.addLink(s39, s4)
+        self.addLink(s40, s3)
+        self.addLink(s40, s4)
+        self.addLink(s41, s3)
+        self.addLink(s41, s4)
+        self.addLink(s42, s3)
+        self.addLink(s42, s4)
+        self.addLink(s43, s3)
+        self.addLink(s43, s4)
+        self.addLink(s44, s3)
+        self.addLink(s44, s4)
+        self.addLink(s45, s3)
+        self.addLink(s45, s4)
+        self.addLink(s46, s3)
+        self.addLink(s46, s4)
+
+        #info( '*** Add Spine-3 links\n')
+        self.addLink(s47, s5)
+        self.addLink(s47, s6)
+        self.addLink(s48, s5)
+        self.addLink(s48, s6)
+        self.addLink(s49, s5)
+        self.addLink(s49, s6)
+        self.addLink(s50, s5)
+        self.addLink(s50, s6)
+        self.addLink(s51, s5)
+        self.addLink(s51, s6)
+        self.addLink(s52, s5)
+        self.addLink(s52, s6)
+        self.addLink(s53, s5)
+        self.addLink(s53, s6)
+        self.addLink(s54, s5)
+        self.addLink(s54, s6)
+        self.addLink(s55, s5)
+        self.addLink(s55, s6)
+        self.addLink(s56, s5)
+        self.addLink(s56, s6)
+        self.addLink(s57, s5)
+        self.addLink(s57, s6)
+        self.addLink(s58, s5)
+        self.addLink(s58, s6)
+        self.addLink(s59, s5)
+        self.addLink(s59, s6)
+        self.addLink(s60, s5)
+        self.addLink(s60, s6)
+        self.addLink(s61, s5)
+        self.addLink(s61, s6)
+        self.addLink(s62, s5)
+        self.addLink(s62, s6)
+
+        #info( '*** Add Spine-4 links\n')
+        self.addLink(s63, s7)
+        self.addLink(s63, s8)
+        self.addLink(s64, s7)
+        self.addLink(s64, s8)
+        self.addLink(s65, s7)
+        self.addLink(s65, s8)
+        self.addLink(s66, s7)
+        self.addLink(s66, s8)
+        self.addLink(s67, s7)
+        self.addLink(s67, s8)
+        self.addLink(s68, s7)
+        self.addLink(s68, s8)
+        self.addLink(s69, s7)
+        self.addLink(s69, s8)
+        self.addLink(s70, s7)
+        self.addLink(s70, s8)
+        self.addLink(s71, s7)
+        self.addLink(s71, s8)
+        self.addLink(s72, s7)
+        self.addLink(s72, s8)
+        self.addLink(s73, s7)
+        self.addLink(s73, s8)
+        self.addLink(s74, s7)
+        self.addLink(s74, s8)
+        self.addLink(s75, s7)
+        self.addLink(s75, s8)
+        self.addLink(s76, s7)
+        self.addLink(s76, s8)
+        self.addLink(s77, s7)
+        self.addLink(s77, s8)
+        self.addLink(s78, s7)
+        self.addLink(s78, s8)
+
+topos = { 'spine': ( lambda: spineTopo() ) }
+
+# HERE THE CODE DEFINITION OF THE TOPOLOGY ENDS
+
+def setupNetwork():
+    "Create network"
+    topo = spineTopo()
+    #if controller_ip == '':
+        #controller_ip = '10.0.2.2';
+    #    controller_ip = '127.0.0.1';
+    network = Mininet(topo=topo, switch=OVSSwitch, link=TCLink, autoSetMacs = True, controller=None)
+    network.start()
+    CLI( network )
+    network.stop()
+
+if __name__ == '__main__':
+    setLogLevel('info')
+    #setLogLevel('debug')
+    setupNetwork()