Cisco VPC technology has solved network redundancy and reliability issues for a long time. However, like any technology, it has potential pitfalls. This video explores the various VPC failure scenarios in a Cisco VPC environment.

Summary

If the VPC peer link is up, the peer keepalive link failure will not be affected. So, the VPC domain forwarding.
If the VPC peer link goes down while having the keepalive link up, then the secondary peer shuts down its VPC interfaces, and only the primary VPC peer will be in a forwarding state.
In case the VPC peer link goes down while having the keepalive link down, then both VPC peers think that the other switch is down, and that causes a split-brain scenario, which causes a forwarding issue.
The VPC auto-recovery command enables the secondary peer to detect gradual failures.

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