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Controller Topology discovery

Hi ,

I have successfully connected my switches( s1 ------ s2) to Controller-helium . GUI is displaying both of switches But the inter-connecting link and the hosts connected to the switches are not shown , even when I ping between the hosts . Do I have to run discovery protocols (eg LLDP) on my switches ??? or does OPENFLOW msgs help in topo discovery ???

I would appreciate if somebody can help me out with the topology discovery mechanism of controller .

Thanks & regards Harsha