vPC between server and nexus switches

[Jozef Staruch]

Hi all,

I would like to ask following question:

We are using virtual portchannels to connect e.g. ESXi-Servers with trunks on two Nexus switches. When the switch "rz2sw1" has gone faulty, we expect that the trunk connections between switch rz2sw2  would still work. That's the reason why they are built. But they didn't as you can see in the screenshot (attaced) former mail.

Do you know what can be problem.. thank you

[danrya]

It appears that the peer-link was down.  If the peer-link is down and the keep-alive is still up, the secondary device will shutdown all of it's VPC links to ensure dual active (split brain) is avoided.

On a Nexus 7000, its recommended to use a front panel (data port) for the keep-alive instead of the management port.  My assumption would be that you are using the MGMT0 for keep-alive and all front panel ports went off-line.  If you use a front panel port for keep-alive and all line cards go off line on the primary, the secondary will take over as expected.