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I have also this message sunddenly on switch :a58.d4fc in vlan 810 is flapping between port Gi1/0/1 and port Gi1/0/802:34:23: %SW_MATM-4-MACFLAP_NOTIF: Host 0023.ea5a.fcfc in vlan 810 is flapping between port Gi1/0/8 and port Gi2/0/1.......