Some doubts with vpc

[blaton]

I have come across a vpc domain that has created some doubts in me. Is the use of the peer switch and peer gateway commands compatible in the same domain?
And I would like to know if there is any debug that can help me see the vpc message exchange in real time without capturing traffic.

[ericnich]

You would be subject to this bug which only affects non-root domains with peer-switch: https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwa83042

The defect was never and likely will never be fixed because the design [peer-switch on non-root] is unsupported. The same is true of any other potential bugs with this approach.

[blaton]

But it says in case of a change in the root bridge, but if there is no change in the root bridge it should not affect it.

[ericnich]

The purpose of STP is to create a redundant loop-free topology in layer 2. If you're operating from the assumption that the network won't change, you might as well just make it loop-free in layer 1.

You're free to pursue any design, but you requested information on what is and isn't allowed. Pavel shared this information, I agree with their view, but you can make the decision for yourself.

[blaton]

No, I just wanted to be clear. I was just trying to clear up my doubts. Thanks.

[MHM Cisco World]

sorry I make you waiting 
I run lab and config different role priority and to force the NSK to me OP primary I need to change priority before I apply pre-empt
can you again please share the step you do and make network drop 
thanks alot

MHM 

[blaton]

The problem is that when I have pulled the link between the nexus from the nexus2 end (primary operational role, but configured as secondary) or when I have used the vpc preempt role command in the same circumstances, I have lost remote connectivity, until I restarted the link between the nexus. The remote traffic went through router1.