hmmm :)
Ok here is the process:
The AP sends CAPWAP discovery messages to discover the controllers, and each controller responds with a CAPWAP discovery response message. After a list of potential controllers is built, the AP chooses to join one of the discovered controllers using the following order of preference:
1. Primary controller: The AP will associate first with its primary controller, assuming the AP has been primed.
2. Upon failing with the primary, the AP will try to register with its secondary and then its tertiary (if configured).
3. If no controller information is primed in the AP, or if the primary, secondary, and tertiary controllers cannot be reached,
the AP then looks for a master controller. The master controller is a feature you configure on a controller (from Controller > Advanced > Master Controller Mode ). Its purpose is precisely to offer a collection point for APs that cannot join their
primary, secondary, or tertiary controller.
4. Finally, if the AP cannot discover a primed controller or a master controller, the AP will select the least loaded from all controllers that have responded to the discovery. Least loaded is relative to the controller license. In that sense, a 2106
controller with 4 APs is more loaded than a WiSM with 30 APs.
5. If no controller can be discovered, the AP reboots and restarts the discovery process.
Hope thsi clarify.
Regards
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