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Wednesday, December 14, 2011

%C4K_EBM-4-HOSTFLAPPING: Host 86:AA:C0:79:AA:6A in vlan 60 is flapping between port Gi5/9 and port Gi5/23

Can you please suggest a fix for this error?

This error code means that packets with same source MAC address coming from two different interface. That means you may have a netwrok loop causing this. You need to go to devices connected to interfaces Gi5/9 and Gi5/23 and check where this MAC is learnt on those. And trace it further same way checking the STP details.
By this you will find a loop to fix it. Most common cause is High CPU on one f the switches in the way or uni-directional link causing STP problems.

Also do a show cdp neighbor and see if the switch sees itself on those 2 ports , if so then those 2 ports are somehow physically tied together and must be fixed , spanning tree won't always fix this situation though it should.


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