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MAC flapping between cluster members


We have cluster with 2 gateways and use VMAC for them.

These gateways connected to the switch and I noticed MAC flapping on it. On port 1 I see VMAC and physical MAC of active cluster member and on port 2 - physical MAC of standby member. In switch logs I see that physical MAC of standby member is flapping between these 2 ports. But cluster state wasn't changed, no related logs in /var/log/messages.

How this behavior can be explained? 


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