13w6d: %RTD-1-ADDR_FLAP: GigabitEthernet0/1 relearning 5 addrs per min
the problem started couple days ago, some of the switches down, i am thinking its pointing towards a loop in the network.Please advise what could be the actual cause and the best way to troubleshoot this..Thankss
All it means is that a mac address is moving back and forth between ports quickly. It is not always a problem if for example if you have wireless access points but in your case I would bet it is a spanning tree issue.
The best way to check whether it ia a spanning tree loop is to check the mac-address-able aging time. If you see that the aging time is 15secs most of the time instead of 300secs, then its a possibility.
These errors are also produced by servers who are teamed together or running NLB.
This can be seen by issuing sh mac-address-table interface command wherein you get multiple MAc address entries
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