I have three UCS C220 servers, out of three one server dedicated management ethernet port is giving very strange behaviour. It is working with one or two Cisco switches and not working working with any other switch, even with the laptop, if I connect my laptop directly with the server.
Same cable with same switch is working on other two ports but only mgmt ethernet port is not working.
What version of CIMC are you running? What are the switch types? It is possibly a duplex/speed issue. There are settings for the CIMC speed/duplex with the latest version of CIMC. Try F8 and test different settings to see if this clears up the issue.
I am using cisco switch, just updated the lastet firmware which is 1.5.4. Actaully what I notice that when we connect the managemnt port first time to any switch it works, but when we disconnect it and connec to other switch it does not work.
Both switches are not connected to each other. We are testing it in our lab.
But when you restart the server, it start working. I believe there is some cache of switch mac on UCS (which technically should not be) thats why it is not connecting.