vpc in Vxlan fabric connectivity issue

[PooriGoudarzi35482]

Hi all

In VXLAN BGP Evpn fabric which it's leafs are vpc configured...when we upgrade one of the switches and it reboots the traffic to the servers are fine and there is no problem , at the moment of re-enabling downlinks on the upgraded switch, we lose connectivity to server about 12 seconds and after that it will be ok.

i tuned the timers like delay-restore and nve hold-down time in vpc to let every thing converged then enabling downlinks.

actually my question is there is no way to make this connectivity issues from 12 seconds to 0? any ideas?

here is the timers that i changed

vpc delay restore 180s

nve hold-down 210s 

[MHM Cisco World]

So you have vPC Nexus as leaf 

You upgrade one and then upgrade other and you face this issue?

MHM

[PooriGoudarzi35482]

yeah exactly.

[MHM Cisco World]

I was busy last days 

I will check and reply to you tomorrow (hop so)

Thanks for waiting 

MHM

[PooriGoudarzi35482]

Thank you for your time it looks like a bug in vpc delay restore 
https://bst.cisco.com/quickview/bug/CSCvm43179 

[Dawei]

You might consider trying the workaround script provided below:
https://developer.cisco.com/codeexchange/github/repo/blcoffee/vpc_fast_convergence/