I wouldn't say the controller ever sends LLDP *to* both switches. I'd say it sends LLDP packets *from* the switches. That is, via the control channel, the controller instructs the switches to send LLDP packets.
More directly answering your question. In a case like you show (utilizing in-band control) On Sep 26, 2013, at 10:14 PM, Windhya Rankothge <windys...@gmail.com> wrote: > > Hi all, > > My question is about a physical network like following, where POX controller > is physically directly connected to S1, but it controlls both S1 and S2 > > C1 > I > S1 --- S2 > > In this case, for the openflow topology discovery, does POX controller send > LLDP packets to both switches which are controlled by it, or does it send to > LLDP packet only to S1 which is directly connected to controller ?? > > Highly appreciate your thoughts.. > > Best Regards, > > Windhya Rankothge
