topic RE: MAC Flapping in ExtremeSwitching (EXOS/Switch Engine)

MAC Flapping

MUNIR_ENG — Thu, 18 Feb 2016 12:14:00 GMT

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?

RE: MAC Flapping

Henrique — Thu, 18 Feb 2016 19:59:00 GMT

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.

RE: MAC Flapping

BrandonC — Thu, 18 Feb 2016 22:40:00 GMT

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

RE: MAC Flapping

Drew_C — Thu, 18 Feb 2016 23:15:00 GMT

You could also have duplicate IP addresses somewhere on the network.

RE: MAC Flapping

MUNIR_ENG — Thu, 18 Feb 2016 23:15:00 GMT

thank for your replayو How to reset the counter of Link UP/ Link Down to zero?

RE: MAC Flapping

MUNIR_ENG — Thu, 18 Feb 2016 23:15:00 GMT

thank you

RE: MAC Flapping

Henrique — Thu, 18 Feb 2016 23:15:00 GMT

Hi Munir, you can use the command clear counters port