Monday 2 February 2015

Traffic flooding in a VPC setup

Data is not getting forwarded, instead it is being flooded in the presence of a VPC scenario.
Possible Cause
The MAC address is learned on one switch only. Typically, this situation would be a bug regarding the synchronization of the MAC address with the VPC peer.
Solution

Clear the MAC address from the switch where it was learned. This triggers new learning and synchronization of the MAC addresses across the VPC switches.

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