04-25-2013 03:21 AM - edited 03-07-2019 01:01 PM
Hi,
As per best practice how many physical link shall we use for vPC peer keepalive link ?
In many document its wriiten to use managment interface only , but a single interface is suffecient for this or we should have atleast 2 interfaces ?
Vijay
04-25-2013 05:25 AM
Hi,
Single interface (mgmt0) is sufficient. There is not much traffic going over this interface. It is mostly keep alive messages between the 7Ks.
HTH
05-01-2013 05:40 AM
Thanks , but if keepalive will goes down then what will happen ?
Also is it recommended to connect managment interfaces back to back with a cross cable or we need to place a switch in between ?
05-01-2013 06:35 AM
It is recommended to use a switch
see figure-3 in this link:
05-01-2013 06:36 AM
I believe best practice is to have them homed to different switch, and use seperate vrf just for the keep-alive. We use that topology with our 7ks
The vPC keepalive link carries the heartbeat message between two vPC peer switches. The failure of the vPC keepalive link alone does not impact the vPC operation or data forwarding. Although it has no impact on data forwarding, we recommend that you fix the keepalive as soon as possible to avoid a double failure scenario that could impact the data traffic.
When both switches come up together (such as after power gets restored following a power outage) and only the mgmt/keepalive link fails, the peers are unreachable. However, all other links, including vPC peer links, are up. In this scenario, reaching the vpc-peers through keepalives are achieved through keepalive links while the primary and secondary role election is established through the vpc-peer link. You must establish the first keepalive for the role election to occur in the case when a switch comes up and the vPC-peer link is up.
When keepalives fail to reach the peer switches, role election does not proceed and the primary or secondary role is not established on either vPC peer switch and all vPC interfaces are kept down on both switches.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide