Create a Post
cancel
Showing results for 
Search instead for 
Did you mean: 
OlKuts
Explorer

MAC flapping between cluster members

Hi,

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? 

Thanks.

0 Kudos
3 Replies
PhoneBoy
Admin
Admin

You'd have to look at tcpdump to see if the primary gateway is actually generating packets with the standby MAC.
To my knowledge, this shouldn't happen.

0 Kudos
OlKuts
Explorer

Thanks for advise.

I collected tcpdump on active member and I see that for one VPN peer standby cluster member responses with his MAC with VIP IP.

0 Kudos
PhoneBoy
Admin
Admin

That could very well be a bug and probably needs a TAC case to investigate.

0 Kudos

Leaderboard

Epsum factorial non deposit quid pro quo hic escorol.

Upcoming Events

    CheckMates Events