Cannot connect to CIMC

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.

scope cimc
scope network
set mode dedicated
set redundancy none
set auto-negotiate yes

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