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VPC+ fabricpath - MAC address flapping between switch-id and VPC id

mmacdonald70
Level 1
Level 1

We have a fabricpath network configured.  For several days, we are seeing our logs filling up with errors from leaf nodes like:

%FWM-6-MAC_MOVE_NOTIFICATION:  Host aaaa.bbbb.cccc in vlan x is flapping between gpc1:502 and gpc1:50

- Most of aaaa.bbbb.cccc.dddd is the mac address of the SVI interface for each vlan gateway

- Vlan is the corresponding vlan for the SVI above

- gpc1:502 is the switch ID for the primary VPC peer

- gpc1:50 is the shared switch id

When I run 'show mac add' on each of the switches with the SVI, the primary shows sup-eth2 and the secondary shows 50.0.0

Show VPC shows VPC up with no errors.

I'm not sure where to look next.

1 Reply 1

Hello. Sorry for disturbing the old treat but did you resolved the issue?
We have the same issue on our Cisco nexus 7000. I have no idea where to find. All the interfaces affected with same thing.

Nexus1 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0198 in vlan 604 has moved from Eth4/15 to 111.0.14
Nexus1 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0199 in vlan 603 has moved from Eth4/15 to 111.0.14
Nexus1 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0196 in vlan 2371 has moved from Eth4/15 to 111.0.14

Nexus2 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0198 in vlan 604 has moved from 114.0.62 to Eth4/15
Nexus2 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0199 in vlan 603 has moved from 114.0.62 to Eth4/15
Nexus2 %L2FM-4-L2FM_MAC_MOVE: Mac 0000.5e00.0196 in vlan 2371 has moved from 114.0.62 to Eth4/15