diff --git a/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
new file mode 100644
index 0000000..7a8c0c6
--- /dev/null
+++ b/TestON/tests/SCPF/SCPFscaleTopo/dependencies/topo.py
@@ -0,0 +1,115 @@
+"""
+    These functions can be used for topology comparisons
+"""
+
+import time
+import os
+import json
+
+def getAllDevices( main ):
+    """
+        Return a list containing the devices output from each ONOS node
+    """
+    devices = []
+    threads = []
+    for i in main.activeNodes:
+        t = main.Thread( target=main.CLIs[i].devices,
+                         name="devices-" + str( i ),
+                         args=[ ] )
+        threads.append( t )
+        t.start()
+
+    for t in threads:
+        t.join()
+        devices.append( t.result )
+    return devices
+
+def getAllHosts( main ):
+    """
+        Return a list containing the hosts output from each ONOS node
+    """
+    hosts = []
+    ipResult = main.TRUE
+    threads = []
+    for i in main.activeNodes:
+        t = main.Thread( target=main.CLIs[i].hosts,
+                         name="hosts-" + str( i ),
+                         args=[ ] )
+        threads.append( t )
+        t.start()
+
+    for t in threads:
+        t.join()
+        hosts.append( t.result )
+    return hosts
+
+def getAllPorts( main ):
+    """
+        Return a list containing the ports output from each ONOS node
+    """
+    ports = []
+    threads = []
+    for i in main.activeNodes:
+        t = main.Thread( target=main.CLIs[i].ports,
+                         name="ports-" + str( i ),
+                         args=[ ] )
+        threads.append( t )
+        t.start()
+
+    for t in threads:
+        t.join()
+        ports.append( t.result )
+    return ports
+
+def getAllLinks( main ):
+    """
+        Return a list containing the links output from each ONOS node
+    """
+    links = []
+    threads = []
+    for i in main.activeNodes:
+        t = main.Thread( target=main.CLIs[i].links,
+                         name="links-" + str( i ),
+                         args=[ ] )
+        threads.append( t )
+        t.start()
+
+    for t in threads:
+        t.join()
+        links.append( t.result )
+    return links
+
+def getAllClusters( main ):
+    """
+        Return a list containing the clusters output from each ONOS node
+    """
+    clusters = []
+    threads = []
+    for i in main.activeNodes:
+        t = main.Thread( target=main.CLIs[i].clusters,
+                         name="clusters-" + str( i ),
+                         args=[ ] )
+        threads.append( t )
+        t.start()
+
+    for t in threads:
+        t.join()
+        clusters.append( t.result )
+    return clusters
+
+def sendArpPackage( main, hostList ):
+    import json
+    """
+        send arping package from host
+        return the total hosts number from Onos
+    """
+    main.log.info("Sending Arping package...")
+    if isinstance(hostList, list):
+        threads = []
+        for h in hostList:
+            main.Mininet1.arping( srcHost=h, dstHost="10.0.0.1", output=main.FALSE )
+    else:
+        main.Mininet1.arping(srcHost=hostList)
+    summaryStr = json.loads( main.CLIs[0].summary().encode() )
+    hostNum = summaryStr.get('hosts')
+    return hostNum