Sizing vPC peer-link

[rlawoaud6]

I'm considering vPC configuration with N9K x 2 units.
According to the recommended configuration(below link), vPC peer link is 10G interface x 2 and 

vPC Peer-Keepalive link is 1G x 1.

Anyway, I want to check if there is no problem with the following configuration.

vPC peer link:100G x 1

vPC Peer-Keepalive link:1G x1  

https://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf

Thanks!

[Seb Rupik]

Hi there,

Redundancy is vitally important for a vPC peer-link, which is why two member links are recommended. 100G has significantly more bandwidth, but is highly susceptible to vPC failure if that single link goes down!

cheers,

Seb.

[balaji.bandi · Accepted solution]

vPC peer link:100G x 2  <<-- always suggest to have 2 links

But 100GB is too high (again depends on where you deploying servers and environment.

We do have many deployments of 9K we use 20Gbx2 it was not saturated any point of time, By saying that we never seen any link failures between these vPC pairs.

Other than that operational poing of view 100GB SFP are expensive bit compare to 20GB /40GB, on top you need to keep some spare of required to replace or test.