MAC Address Flapping - Wireless

Answered Question
Sep 13th, 2010

Friends,

I am having an issue here (not serious i guess).

I have 4 Wisms running on a VSS setup. with 400 APs.

I have been receiving the following logs on the VSS

Sep 12 19:39:10: %MAC_MOVE-SW1_SP-4-NOTIF: Host 001c.bf81.b7bb in vlan 220 is flapping between port Po704 and port Po736

Sep 12 19:39:10: %MAC_MOVE-SW1_SP-4-NOTIF: Host 0024.c454.fac6 in vlan 212 is flapping between port Po735 and port Po736

These are just 2 logs that i have put in, but im getting many more of them.

vlan 220 and 212 are user vlans in the network.

Now, my guess is that they are clients roaming between access points connected to different controllers.

or if Im wrong, is there something serious that i need to look into.

Thanks,

Phil

I have this problem too.
0 votes
Correct Answer by Stephen Rodriguez about 6 years 4 months ago

Phil,

     Your guess is correct.  In Wireless, the MAC-Flap notificaiton is 99.999% due to a client roaming between AP on different WLC.

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Correct Answer
Stephen Rodriguez Mon, 09/13/2010 - 06:33

Phil,

     Your guess is correct.  In Wireless, the MAC-Flap notificaiton is 99.999% due to a client roaming between AP on different WLC.

Philip T Kurien Mon, 09/13/2010 - 23:15

Thanks Steve,

On further investigation, ive found 90% of the macs showing up are wireless phones or iphones.

So i guess its ok.

Thanks for the help!

Phil

Vinay Sharma Sun, 09/25/2011 - 10:59

Hello Philip,

Please mark the Question as Answered, if the provided information by Stephen is correct and it helped. By doing that others can take benefit as well.

Thanks,

Vinay Sharma

Community Manager – Wireless

dhanraj80 Wed, 07/31/2013 - 01:42

Hi Vinay Sir, I need your support for wireless issue.

I  getting multiple mac flap error messge in cisco 4507 Core switch while  my mobile clietnts roaming from one AP to another AP due to this my  whole lan network goes down.

And im having cisco AIR-CT2504-K9 controller also.

Requesting you to kindly help me in this case.

Thanks

dhanraj poojari

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