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After a scheduled downtime of your 5508 WLC, you notice that only a handful of the 100 APs are rejoining the controller.

All the APs are in the same subnet and use default settings.

Cisco WLC debugs indicate that the APs are sending discovery and join requests.

Only after shutting down all the switch ports that connect to the APs and turning five ports back on at a time can you rejoin all the APs.

Why were the APs unable to rejoin the Cisco WLC, and how can you prevent this from happening in the future?