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Upgrade problem on Cisco 4402 WLAN Controller
I have a problem that came during an upgrade on a Cisco 4402 WLAN Controller. I am upgrading from version 4.1.185.0 to 4.2.130.0. After successfully TFTP'ing the new image to the controller it started upgrading the 40+ LWAP's assigned to it. The first ten started "Downloading" but have been stuck in this process for nearly 18 hours now without result.
I'm aware of the Cisco bug ID CSCse60203 but that is for an older revision of code. I do not have access to the LWAP's physically (they are 35 feet up in a warehouse.) Is there a way to back out of this controller upgrade (the controller hasn't yet rebooted) or to somehow reset these AP's to bring them back online?
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by: skpruettPosted on 2008-08-19 at 06:21:30ID: 22259470
With TAC assistance I have solved this question. This is a known bug that can happen during a code upgrade on a controller. The LWAP's will never finish downloading because they need the new image which is actually not on the controller until it reboots. You can't reboot the controller due to the LWAP's attempting to download.
To break out of this loop, it was recommended to either shut the access off to the LWAP's at the switch, or to change the controller config under Security->AAA->AP Policies. Enable "Authorize APs against AAA," then apply and save. This will eventually cause all LWAP's to lose connection with the Controller (if this was not enabled beforehand.) To speed this process along you can also reboot the LWAP's. Once all have become unassociated with the controller you may then reboot the controller, which will load the new image.
After reboot, disable "Authorize APs against AAA" and ensure LWAP's reconnect to the controller, download the new image, and eventually fully re-associate.