Symptom

MAC flapping between GPC and FabricPath switch-id triggered by IGMP leaves: 2016 Feb 18 21:04:25.296 N7k-1-Compute %L2FM-4-L2FM_MAC_MOVE: Mac 0000.dead.beef in vlan 240 has moved from gpc1:13 to 13.0.0 2016 Feb 18 21:04:25.296 N7k-1-Compute %L2FM-4-L2FM_MAC_MOVE: Mac 0000.dead.beef in vlan 240 has moved from 13.0.0 to gpc1:13 2016 Feb 18 21:04:25.296 N7k-1-Compute %L2FM-4-L2FM_MAC_MOVE: Mac 0000.dead.beef in vlan 240 has moved from gpc1:13 to 13.0.0 2016 Feb 18 21:04:25.297 N7k-1-Compute %L2FM-4-L2FM_MAC_MOVE: Mac 0000.dead.beef in vlan 240 has moved from 13.0.0 to gpc1:13

Conditions

- IGMP snooping turned off globally on spines and leaves - IGMP leave received on N7k over FabricPath core port - Mixed M/F VDC

Workaround

Enable IGMP snooping globally on at least one N7k

Further Problem Description