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Issue to create topology in Mininet


I have just started learning SDN. I am getting below error while trying to create topology through mininet.

tanvir@tanvir-virtual-machine:~/Desktop/Master$ sudo mn --mac --controller=remote,port=6653 --topo=tree,2[sudo] password for tanvir: * Creating network Adding controller Adding hosts: h1 h2 h3 h4 Adding switches: s1 s2 s3 Adding links: * gave up after 3 retries tanvir@tanvir-virtual-machine:~/Desktop/Master$

Below is the log from ODL Karaf (Beryllium) controller command "log:tail"

2016-05-31 00:52:44,813 | INFO | entLoopGroup-7-3 | SessionManagerOFImpl | 176 - org.opendaylight.openflowplugin - 0.2.2.Beryllium-SR2 | context for invalidation not found 2016-05-31 00:52:44,815 | INFO | entLoopGroup-7-3 | ConnectionConductorImpl | 176 - org.opendaylight.openflowplugin - 0.2.2.Beryllium-SR2 | OF handshake failed, doing cleanup.

Can someone help me out to resolve the issue.