How Virtual Port Channel Avoid Duplicate Frames

There is one critical rule with vPC. If a member port receives a frame, it is forwarded across the peer-link. When the peer switch receives it, it will not forward the frame out a vPC member port. Why does this happen? Have a look at the diagram below.

Frames received on a member port, then forwarded across the peer-link, will not be forwarded out another member port

There are two servers connected by vPC member ports. Server-1 sends a frame to Server-2. The traffic flows like this:

1. The frame travels up the link from Server-1 to Peer-1

2. Peer-1 forwards the frame down the link to Server-2

3. Peer-1 also forwards the frame across the peer-link to Peer-2

4. Peer-2 sees that the frame came from a vPC member port, and refuses to forward it to Server-2

So, why does Peer-2 drop the frame? Peer-1 has already delivered it. If Peer-2 also tried to deliver the frame, server-2 would receive a duplicate frame.

Of course, this does not apply to orphaned ports. They are not multi-homed with vPC, and cannot get duplicate frames.

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