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Chapter 5. Configure and Troubleshoot th... > Configure and Troubleshoot Mobility

Configure and Troubleshoot Mobility

The concept of mobility with respect to the WLC is a way to have a group of controllers sharing information about the end clients. This allows seamless roaming across APs joined to different controllers. In some way, it’s like having a group of controllers acting as a single WLC.

When a client associates to an AP, the controller adds information about this client in its client database. The entry for any given client includes, among others, details such as the client MAC and IP addresses, the security context, the QoS context, the WLAN, and the AP the client is associated to. The client can seamlessly roam to an AP managed by the same controller, as the WLC updates the traffic flow and the client database entry as soon as the roaming process is complete, to reflect the fact that the client is now associated to a new AP. The roaming among APs joined to the same controller is called intracontroller roaming.


  

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