We are running Cisco Emergency Responder version 11.5.4.50000-6 and trying to discover phones connected to a Catalyst 9300 stack (C9300-48P) on version 16.08.01a. There are three member switches connected via StackWise and the stack is fully operational. CER detects the switchports and phones connected to the switch 1 and 2, but it doesn't even detect the ports of switch 3. I re-ran "Locate switch-port", but no success. It's as if this stack only had two members. I check the logs on CER and there's no indication of discovery errors. Running CDP command on switch shows ports and phones of all members of the stack.
I should mention that switch 3 was added later to the stack, after switches 1 and 2 were stacked and fully operational for a while beforehand.
What could be causing CER to miss switch 3 of this stack? Is there a potential compatibility issue? Or, do one or more CER services need to be restarted?
