CCNA Wireless 640-722 Official Cert Guide

Selecting a WLC

Once an AP has finished the discovery process, it should have built a list of live candidate controllers. Now it must begin a separate process to select one WLC and attempt to join it. Joining a WLC involves sending it a CAPWAP Join Request and waiting for it to return a CAPWAP Join Response. From that point on, the AP and WLC build a DTLS tunnel to secure their CAPWAP control messages.

The WLC selection process consists of the following three steps:

Step 1. Try primed addresses—If the AP has previously joined a controller and has been configured or “primed” with a primary, secondary, and tertiary controller, it will try to join ...