Hello @Ibrahim Jamil
First, if only keep-alive fails, nothing will happen. Only heartbeat between primary and secondary node will be lost.
Also, in case of primary switch failure in vPC, secondary switch will be promoted as operational primary and forward all the traffic. If secondary switch fails, primary will keep forwarding traffic like earlier.
For you scenario, Peer-link failure, followed by Keep-alive link, the member port will be suspended first due to peer-link down, but the heartbeat is there through keep-alive link. Traffic will flow through the primary peer switch. Now, if keep-alive fails, the suspended ports will remain suspended and all the traffic keeps flowing through primary node.
In the case of the Keep-alive link failure, followed by Peer-link, this failure is most critical. If keep-alive link fail first, nothing will happen due to vPC peer roles are already decided. However, if peer-link dies after the keep-alive, secondary vPC node will start thinking that, the primary node are completely down because of no heartbeat from Primary node. So, secondary node will become operational primary. In this case, both vPC nodes will forward the traffic. This type of scenario called split brain scenario in vPC.
Best regards
.ı|ı.ı|ı. If This Helps, Please Rate .ı|ı.ı|ı.
