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Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 12 Configuring Mobility GroupsWireless Device Access
Overview of Mobility
Overview of Mobility
Mobility, or roaming, is a wireless LAN client’s ability to maintain its association seamlessly from one
access point to another securely and with as little latency as possible. This section explains how mobility
works when controllers are included in a wireless network.
When a wireless client associates and authenticates to an access point, the access point’s controller
places an entry for that client in its client database. This entry includes the client’s MAC and IP
addresses, security context and associations, quality of service (QoS) contexts, the WLAN, and the
associated access point. The controller uses this information to forward frames and manage traffic to and
from the wireless client. Figure 12-1 illustrates a wireless client roaming from one access point to
another when both access points are joined to the same controller.
Figure 12-1 Intra-Controller Roaming
When the wireless client moves its association from one access point to another, the controller simply
updates the client database with the newly associated access point. If necessary, new security context
and associations are established as well.
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