We are looking to upgrade our 5508 wireless controller from 220.127.116.11 to 18.104.22.168. Reason being, we have experienced a lot of access points disassociating from the controller as well as client authentication issues. Has anyone upgraded from 22.214.171.124 to 126.96.36.199 and experienced any issues during the upgrade or after the upgrade?
This is the original thread discussing the predownload issue. The code upgrade goes very smoothly... it's when you get to the AP's that the problems start. If you do not have any maintenance window restrictions, then you have no problems ahead.
Please read the above thread, it will shed a lot of light on the subject.
Rule of thumb: If you predownload the image to the AP's and "swap" the images, if the new image doesn't show as primary, you have a problem. When you reload the wlc's and the AP's, the AP's will rejoin and "think" they have earlier code. they will redownload, notice I say redownload the new code... even though it already exists in flash. Then they will reboot again. If you/your company has no problem with this method, you'll be fine.