We cannot reach the CIMC of a C series Cisco server. It was working perfectly before. We couldn’t ping it. Soft reboot, physical power cycle did not help. There are no errors on the switch ports. The ports are the server and switch do not have link. A colleague was able to reach the CIMC by directly connecting his laptop to the CIMC NIC port. This proves the CIMC is working fine. He set the CIMC NIC to auto negotiate which fixed the issue. We are still at lost why it worked before as there has been no change in the switch.
Auto-negotiate is our standard configuration. This server being one of the first we deployed, we might have missed this step.
This is our standard CIMC network configuration.
top scope cimc scope network set mode dedicated set redundancy none set auto-negotiate yes commit