Intercontroller Roaming – This figure shows intercontroller roaming, which occurs when the wireless LAN interfaces of the controllers are on the same IP subnet
When the client associates to an access point joined to a new controller, the new controller exchanges mobility messages with the original controller, and the client database entry is moved to the new controller. New security context and associations are established if necessary, and the client database entry is updated for the new access point. This process remains transparent to the user.
Note: All clients configured with 802.1X/Wi-Fi Protected Access (WPA) security complete a full authentication
in order to comply with the IEEE standard.