Failures seen when a link between IOM and fabric interconnect (an IOM HIF port) goes down are more easily understood when the static route pinning applied to the servers in the chassis is understood. The quickest solution may be simply to reacknowledge the chassis, but understanding this topic will provide insight into when to apply that solution.
Table 2 Link Pinning on an IOM
Number of Active Fabric Links
Blade slot pinned to fabric link
All the HIF ports are pinned to the active link
1,3,5,7 to link-1
2,4,6,8 to link-2
1,5 to link-1
2,6 to link-2
3,7 to link-3
4,8 to link-4
8-Link (Applies only to 2208XP )
1 to link-1
2 to link-2
3 to link-3
4 to link-4
5 to link-5
6 to link-6
7 to link-7
8 to link-8
Only 1,2,4 and 8 links are supported. 3,5,6, and 7 links are not valid configurations.
Here is an example of an expected behavior:
There are four active links on each IOM to their respective fabric interconnects.
Link 4 between IOM-1 and its fabric interconnect (currently Active) is accidentally unplugged by a datacenter worker.
Connectivity through IOM-1 from blade slots 3,4,7, and 8 fails over to IOM-2 and the standby fabric interconnect. While you might think that only slots 4 and 8 would be affected, link 3 fails administratively because 3 link configurations are not supported. Data throughput is not lost, but the failure is noted in Cisco UCS Manager.
At this point you can either:
Resolve the connectivity issue by plugging link 4 back in. Normal configured operation will resume.
Re-acknowledge the chassis, and the configuration will re-establish pinning to work over 2 fabric links. If at a later time the links are replaced or repaired, a second re-acknowledgement will be needed.
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