Mac address flapping
Platform: - Cisco catalyst switches
The Problem: - We installed a new switch and
made an ether channel of its two ports with another layer 3 switch. Ether
channel was up but continuously messages were coming that mac address flapping.
The solution:- The problem was that on the new
switch ether channel was in on mode while on layer 3 switch it was auto mode so
ether channel was not formed although on new switch in sh etherchannel
summary command link was showing up up.
In actual the layer
3 switcvh did not formed the etherchannel so there was a loop in the network.
We made the ports on
layer 3 switch also into on mode and everything started working fine.
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