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MAC Flapping


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?

6 replies

Userlevel 6
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.
Userlevel 7
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
Userlevel 7
You could also have duplicate IP addresses somewhere on the network.
Drew C. wrote:

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

thank for your replayو How to reset the counter of Link UP/ Link Down to zero?
Userlevel 6
Drew C. wrote:

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

Hi Munir, you can use the command clear counters port
Drew C. wrote:

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

thank you

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