Cisco Cisco Access Registrar 4.2 Especificaciones descargar pdf (Pagina 484)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 11 Configuring Mobility GroupsWireless Device Access

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 11-1 illustrates a wireless client roaming from one access point to

another when both access points are joined to the same controller.

Figure 11-1 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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