I have a lab setup where the controller is connected to the management ports of three OF switches through another L2 switch (another X440). The three switches are able to connect to the controller but the connection between them isn't discovered by the Topology manager in OpenDaylight. I see an empty topology through the REST API and the web view shows three isolated switches. I suspect this is because the L2 switch isn't forwarding the LLDP packet sent by the controller to the three OF switches. I may be completely wrong though. Do I need to enable some LLDP related feature/setting on the X440s to forward LLDPs? Or disable some feature on the one I'm using as a simple L2 switch? Kindly help me figure out why the topology isn't discovered by the controller.