WCS Alarm Mail Spam after Upgrade to 5.2 on WLCs

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Feb 24th, 2009
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iam running a WCS 5.2 with some WLCs on 5.2. Since i have upgrade them to 5.2 the WCS Email-Alarm-Notification spams my mailbox with the following informations :

{wlcname} AP 'apname', interface '802.11b/g/n' is up on Controller 'ip-adress'.

{wlcname} AP 'apname', interface '802.11b/g/n' is down on Controller 'ip-adress'.

The crazy thing is that the mail relay first posts the up message and then the down message so there is maybe 1 Second downtime. (the mails are coming in the same second)

If i check all the logs of the wlcs i can't see any dissassociation of an accesspoint or any problem that causes the wlc to send a trap or write a syslog. So i have sniffed the Wcs snmp communication and i can see that the wcs polls in the same time the wlc but there is only about 3-4 ms duration time between the request and response so the reason for that "mail-spam" is hard to find for me..

Do you have any ideas where i can see the reason for that problem ? Is there any timer on the wcs for generating this alarms ?

Otherwise i have to contact the TAC support.

Thanks for ideas, Dennis

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Leo Laohoo Tue, 03/03/2009 - 21:18
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Go to the WLC, Management -> SNMP -> Trap Controls -> AP Tab and then un-tick "AP Interface Up/Down".

Hope this helps.

dneckermann Wed, 03/11/2009 - 00:32
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Hi, this wont solve the problem. This is only a workaround to disable the messages.

wmblake755 Thu, 03/19/2009 - 07:12
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Having the same problem with 5.2, anyone else see this? Also, which alarm category does this belong to in WCS?

heiko.bachofner Thu, 07/09/2009 - 23:49
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Hi Dennis,

a customer of us have the same problem.

Did you get any answer,yet or do you opened a TAC Case ?

Best regrads


dneckermann Mon, 07/13/2009 - 21:26
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we have no answer about this problem. After an upgrade to 6.0 there is no problem anymore.

Regards Dennis

tdhb..hiq Sun, 08/08/2010 - 16:38
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I am having similar problems, but we have version 6.

Whenever a AP changes channels, to reduce noise or interference, I recieve alarms stating as below;

802.11b/g/n interface of AP THA-A-AP-04 is down: Controller Reason: Unknown.

802.11b/g/n interface of AP THA-A-AP-04 is up: Controller Reason: Unknown.

Is there a way to reduce these messages or mitigate them? I still want to know if the AP goes down, but not every time there is a change in channel.


WCS Version
WLC Software Version 6.0.182.


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