vpc peer-keepalive link failure

[sandevsingh]

Hi, we are doing some acceptance testing in our environment before we put the nexus5ks in a vpc pair in production. Was curious to know, what will happen if the peer-keepalive-ink fails?

[Edison Ortiz]

Nothing happens if the peer-link remains up. If the peer-link fails, it won't come up until the peer-keepalive-link is also up.

Additionally, if the peer-link fails - there is no way to know each other status so traffic will be sent to both links.

The peer-keepalive-link is used to detect this kind of situation

[sandevsingh]

ok great, is there a way to prempt the vpc domain primary switch back to active after a reboot? In other words, lets say i reboot n5k-A with the current vpc role of primary, the secondary obviously takes over the vpc primary role. BUT when n5k-A comes back up it stays as operational secondary. Would be good in troubleshooting situations.

[Reza Sharifi]

No, there is only role priority and not preemption.

HTH

[Edison Ortiz]

vPC does not support preemption.

The documentation contains all the information you need:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/interfaces/521_N11/b_5k_Interfaces_Config_Guide_Release_521N11_chapter_0101.html

Regards,

Edison

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