Nexus 7K VPC_Redundancy _Peer-link isolate

[NDP]

"operational secondary peer device will shut its vPC member ports once peer-link is down" 

if this is the case, can it provide the redundancy if the primary operational device is powered off for some reason.

I understood that all the VPC member ports on secondary device are shutdown by VPC since it lost VPC peer-link.

if the primary device is reloading and secondary device shutdown member ports, access devices connected to the two Nexus devices will also experience the  network outage.

Please correct me if am wrong,

Thank you 

[Paul Chapman · Accepted solution]

Hi Durga -

The Best Practice is to enable the vPC Auto-Recovery feature.  This will allow the secondary to take over if the primary is detected as down due to connection loss over the vPC Peer Keepalive link.

vPC Best Practices Guide for Nexus 7000

PSC

[NDP]

hi Paul,

i was not aware of Auto-recovery feature. just got a link from forum.

https://supportforums.cisco.com/document/102781/vpc-auto-recovery-feature-nexus-7000 

Thanks 

[InayathUlla Sharieff · Accepted solution]

Durga,

Yes thats the best option to enable on the nexus device. All the magic things happens when the peer-link goes down the secondary device will suspend all its link along with layer 3 interfaces. untill now everything will be okay all the traffic will be taking primary switch and you will not see any interupt of the traffic. 

Now consider that due to some reason your primary switch goes down you will have complete network outage right? So what is the next solution though you have good secondary box but it is not getting utilized at this point of time due to vpc dual active scenario condition( it has shut/suspended ports) so untill you get back the primary switch active and peer-link/peer-keepalive is up the secondary switch stays in down state. 

Hence what option do we left to bring the secondary switch online when primary goes down the feature is called as "auto-recovery" this will help to bring the secondary switch interfaces back online by bypassing the vpc check parameters and send all the traffic through it. In this way you will utilize the secondary switch in a good way.

HTH

Regards

Inayath

[NDP]

it is clear information. I can easily convenience management with this information. 

Thank you so much.