MAC Flapping

[MUNIR_ENG]

I have twenty-five devices of eXtreme switch type Summit X450-24X DC with software version 15.3.1.4 patch1-38 , I'm facing problem with Flapping MAC.. my question, how do I Know Since when has been getting this Flapping?

[BrandonC]

In addition to what Henrique suggested, if you are seeing MACs flapping, you may have a loop. I would suggest running ELRP on the problematic VLAN.

-Brandon

[Henrique]

Hi Munir,

You can add a log entry to track the MAC-Moves and be notified as soon as the flapping starts.

Since this can add lot of log entries you can enable a syslog server or even increase the switch log buffer from 1000 to 20000.

If the flapping already started and if you didn't have those logs entries added, I don't believe you will be able to find the exact date/time.