port flapping in l2 switch

[ajayaram48@gmail.com]

please any one give solution how to trouble shoot 

[luis_cordova · Accepted solution]

Hi ajayaram48@gmail.com,

The common cause of link flap is a Layer1 issue such as a bad cable, duplex mismatch.

The problem could be Layer2, related to the wrong configured in STP or VTP.

Check the logs to find the reason for the problem.

Regards

[Leo Laohoo]

Run a TDR.