Discovering a WLC
A LAP must be very diligent to discover any controllers that it can join—all without any preconfiguration on your part. To accomplish this feat, several methods of discovery are used. The goal of discovery is just to build a list of live candidate controllers that are available, using the following methods:
Prior knowledge of WLCs
DHCP and DNS information to suggest some controllers
Broadcast on the local subnet to solicit controllers ...
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