1.I understand that irrespective of the STP priority, vPC primary always sends the BPDUs.The vPC secondary device will just proxy those BPDUs.
Please confirm if the above understanding is correct.
2.If vPC secondary has lower STP priority than vPC primary, who becomes the root switch? Who will forward the BPDU and who will proxy the BPDU?
3.Imagine N5k1 is vPC primary.It also has lower STP priority. Now if for some reason, N5k1 goes down, N5k2 becomes operational primary. N5k2 also becomes the STP root.
From one of the blogs, i read:
Now the Primary failed Switch N5K-1 comes online but vPC role is non-Preemptive in that case Primary N5K-1 continue to be act Operational Secondary but we have configured lower STP priority earlier on N5K-1 , now we have STP role change , Peer link will become STP root Port and that will trigger SYNC process inherit in VPC process , which blocks vPC trunk member port although time conumpation in overall process of SYNC is quite low but in production HFT envirnoment it matter alot .
So to avoid this, we use vpc peer-switch command.
Please confirm if the above behaviour is expected