“AP 'AP1’, interface '802.11b/g' is down on Controller '”

Unanswered Question
Feb 2nd, 2010


Our WCS receives continuously this type of alarm: “AP 'AP1’, interface '802.11b/g' is down on Controller '” for all the access points registered in the controller. Although the alarm is cleared within a few seconds, the email is sent to the customer, which involves too many emails.

Does any troubleshooting we can carry out to make sure these are real alarms? In the case the interface was getting down and up, what could be the reason? And how could fix it?

Following you can see the version or the controller and for the APs:

            Controller version -

            IOS version -12.4(18a)JA1

            Mini IOS version -

            Boot version -

Thanks in advanced.

Best regards,
Laura Herrero

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Overall Rating: 0 (0 ratings)
Leo Laohoo Tue, 02/02/2010 - 13:26

Upgrade to or 6.0.0188.0 and call us in the morning. 

George Stefanick Tue, 02/02/2010 - 20:08

Hi Laura,

What type of controllers do you have? How many access points? What type of access points?

To Leo's point. You may want to consider an upgrade. Ive installed 100+ controllers and i dont think i ever came across this one before ...

satcomjimmy Wed, 02/03/2010 - 06:23


You may have a power issue, I have had issues with certain access points doing similar things to this, and there were sometimes issues with power being delivered or power injector settings that had to be tweaked, especially after upgrading to 5.2. If it is not getting enough power, the AP may stay associated and the radio will not power up. You will see it on a console session on the AP, though there may also be debug commands on the controller to find this out.

Leo Laohoo Wed, 02/03/2010 - 20:09

I saw this message when I ran 5.X but after upgrading to 6.X the error messages go away.

lauraherr Thu, 02/04/2010 - 10:08


Thanks for your posts. We have 4 controller 4402, neither has more than 20APs peer controller, and all of them shows this messages in the WLC.Is it any bug? If you don't see these messages with version 6.x I will upgrade the controllers, I hope it fixed te problem!



Leo Laohoo Thu, 02/04/2010 - 13:32

I understand your apprehension (I would too).  Upgrade one-by-one and observe.


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