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3502i keeps dropping off WLC 2504

Our 3502i keeps dropping off the WLC at random times and then re-connects after a reboot or by it self at random times. Cisco as already replaced the AP but the replacement is doing the same thing. We have changed the cable, the switch port, and the AP. I don't believe its anything to do with the config as we have 4 other 3502 connected to the same switch and WLC that have not had any issues.

Has anyone else seen this issue or have any suggestions?

Cisco AIR-CT2504-15-K9

Software Version

Field Recovery Image Version   1.0.0

License Level   base

Cisco AIR-CAP3502I-A-K9

Primary Software Version

Backup Software Version

Predownload Status   NONE

Predownloaded Version   NONE

Boot Version

IOS Version   12.4(23c)JA4

Mini IOS Version

As per the log “Last reset reason: watchdog timer reset” it is because of bug ID:

CSCtu24972 - 3500 / 3502 AP WDT resets on without crash info

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3502i keeps dropping off WLC 2504


Did you ever get to the bottom of this?

I recently deployed 250 3502i access points, and I would plug them in and they would find the controller and be happy.  Then, the next day, I would walk in and the light would be flashing green, and it was not on the controller anymore.  I thought it was related to CSCtu24972, but it turned out to be some funky patch cables.  We replaced them, and the APs work fine.



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3502i keeps dropping off WLC 2504

Primary Software Version

Upgrade to either or 7.2.X.


3502i keeps dropping off WLC 2504

Thanks everyone. It ended up being a bad AP. Seems to be an know issue with Cisco. They had to send us out two before we got one that worked. It has been up and working ever since. We did testing on all the cables and patch ports moved things around, went directly into the WLC, but still had the same issue. Finally replacing the AP on the second time worked. Didn't get a chance to test the software update, but i think cisco was pointing more to hardware as the issue.

Thanks for eveyones help.

My Help team:

Ben received the replacement AP and I’m afraid that we’re having problems with this one dropping off of the controller as well. 

This time we are seeing watchdog timer reset messages on the controller:

31 Wed Mar 28 13:48:55 2012 AP's Interface:1(802.11a) Operation State Down: Base Radio MAC: Cause=Radio reset due to Init. Status:NA

32 Wed Mar 28 13:48:55 2012 AP's Interface:0(802.11b) Operation State Down: Base Radio MAC: Cause=Radio reset due to Init. Status:NA

33 Wed Mar 28 13:48:54 2012 AP 'FLPEM-AP3', MAC: disassociated previously due to AP Reset. Uptime: 0 days, 00 h 01 m 04 s . Last reset reason: watchdog timer reset.

60 Wed Mar 28 13:46:47 2012 AP Disassociated. Base Radio MAC:

After connecting to the AP upon reboot, we are seeing the same when running a show ver:

FLPEM-AP3 uptime is 7 minutes

System returned to ROM by watchdog timer expired

System image file is "flash:/ap3g1-k9w8-mx.124-23c.JA4/ap3g1-k9w8-mx.124-23c.JA4"

Part Number                          : 73-12175-05

PCA Assembly Number                  : 800-3226

PCA Revision Number                  : A0

PCB Serial Number                    : FOC1532

Top Assembly Part Number             : 800-32891-01

Top Assembly Serial Number           : FTX154

Top Revision Number                  : A0

Product/Model Number                 : AIR-CAP3502I-A-K9

Configuration register is 0xF

I saw some older bugs that looked like they pertained to only 1252 APs but was wondering if we might be running into something similar yet new.

Ben has tried moving this AP to different switchports and has experienced the same results.  We have the 4 other APs on the same switch and none of them are experiencing similar behavior. 

Does this sound like something you’ve encountered before? 

This was from Cisco:

Yea, probably hitting CSCtu24972.  Which seems to be a bootloader issue on the AP, but until the image is out, the work around is to replace the AP.  So I can send you a replacement for it.  But you will not sent the bad one back the way you normally would.  I assume send it to the same address, if you could just get me the serial number from the AP.


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