I'm having a weird issue with vPC on N5K (5548P), running 5.0(3)N1(1) - Today I noticed that the N5K infrastructure had crashed. While looking into it, the problem was with vPC. What happened was that the switch noticed a loop, and brought down the vPC peer-link.
vPC domain id : 420
Peer status : peer link is down
vPC keep-alive status : peer is alive
So the Port channel holding the vPC peer-link was down, whereas the individual members in the link were up. I tried rebuilding the port-channel, rebuilding the vPC peer-link etc, but no luck. Each N5K was showing that it was to ROOT for ALL the VLANS (though originally each N5K was the root for one set of VLANS).
I had to shutdown the second N5K to have the environment up and running. Looking at the time when everything happened, the logs are of the form:
Looks like your L2 vPC environment is not configure correctly. Nothing much I can see here except I will not split up spanning-tree root between switches in vPC. They can all be in the same switch since vPC will always forward traffic.
If you post the config here, I can take a quick look to see if I can spot anything wrong with it.
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