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Webcast-Catalyst9k
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FWSM module flapping on 6509 backplane

I have a 6509 with an active FWSM in slot 3 and failover (standby) in slot 4.

 

I noticed today that a message appeared in my switch log that the module in slot 3 was seemingly flapping between the port-channels on the backplane. Po307 should be the active FWSM and as far as I know, Po308 should be the failover/standby.

 

The message was

 

%MAC_MOVE-SP-4-NOTIF: Host 0016.c782.eb80 in vlan 307 is flapping between port po308 and po307

 

And a bunch of vlans are listed in this error, which represent the firewalled vlans on the FWSM.

 

When I check to see if there was a failover event on the FWSM, it does not indicate that there was.

 

What might be going on here?

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