Cisco: vPC peer gateway
Why do we need it?
- Some vendors like NetApp and F5, they use switch system MAC to construct packets instead of virtual MAC.
- Or it is by a feature called fast path, which just flip the source and destination MAC.
- when mlagA receives a packet with destination mac of mlagB, it has to forward it to mlag peer via peer link, which is not a favored behavior
Configuration:
- ip virtual-router mac mlag-peer
How does it work?
- MLAG peer create an additional MY_MAC entry with MLAG peer address.
- When it gets packet with this MAC, just route them instead of fwding via peer link
Useful command and supported platforms
- T2 and Arad
- show ip virtual-router
- show platform trident l3 shadom my-station
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