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please check the controller IP's are changed in the multitree.py script before creating topology. we have tested the multicontroller tutorial for VTN it was working fine in our environment. could you please tell me which karaf distribution your using. after creating mininet topology please execute below command in both controller see your able to get topology information curl -v --user "admin":"admin" -H "Accept: application/json" -H "Content-type: application/json" -X GET http://10.106.138.249:8282/restconf/operational/vtn-topology:vtn-topology { "vtn-topology": { "vtn-link": [ { "destination": "openflow:1:1", "link-id": "openflow:2:3", "source": "openflow:2:3" }, { "destination": "openflow:1:2", "link-id": "openflow:3:3", "source": "openflow:3:3" }, { "destination": "openflow:3:3", "link-id": "openflow:1:2", "source": "openflow:1:2" }, { "destination": "openflow:2:3", "link-id": "openflow:1:1", "source": "openflow:1:1" } ] } } "sudo ovs-vsctl show" will list the switches connected to the controller as below you are getting only mininet version could be mininet issue. mininet@mininet-only:~$ sudo ovs-vsctl show [sudo] password for mininet: dedcbf5a-b730-4937-b453-6a36246917ae Bridge "s2" Controller "tcp:10.106.138.249:6633" is connected: true Controller "ptcp:6635" failmode: secure Port "s2-eth2" Interface "s2-eth2" Port "s2-eth3" Interface "s2-eth3" Port "s2" Interface "s2" type: internal Port "s2-eth1" Interface "s2-eth1" ...