You notice that your IO module in your Cisco UCS B series infrastructure throws the following error message:
Navigating to the faults tab of your IO module shows the following details:
Affected object: sys/chassis-1/slot-2 <— note that this could be any chassis or slot
Description: IOM 1/2 (B) current connectivity does not match discovery policy: unsupported-connectivity
Original severity: major
Previous severity: major
The cause is actually quite simple and it’s because you have, say, a 2-link policy set for your chassis discovery policy but you only have 1 link plugged in between your IOM and the fabric interconnects:
Note that an error won’t get thrown if you have, say, a 1-link policy set but you have 4 links plugged in so in this case, since we only have 1 cable plugged in from the IOM to the fabric interconnects, changing the policy to 1 link will fix the problem.