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Cisco Wireless LAN Controller Configuration Guide
OL-9141-03
Chapter 11 Configuring Mobility GroupsWireless Device Access
Overview of Mobility Groups
As shown above, each controller is configured with a list of the other members of the mobility group.
Whenever a new client joins a controller, the controller sends out a unicast message to all of the
controllers in the mobility group. The controller to which the client was previously connected passes on
the status of the client. All mobility exchange traffic between controllers is carried over an LWAPP
tunnel. IPSec encryption can also be configured for the inter-controller mobility messages.
A mobility group can include up to 24 controllers of any type. The number of access points supported
in a mobility group is bound by the number of controllers and controller types in the group.
Examples:
1. A 4404-100 controller supports up to 100 access points. Therefore, a mobility group consisting of
24 4404-100 controllers supports up to 2400 access points (24 * 100 = 2400 access points).
2. A 4402-25 controller supports up to 25 access points, and a 4402-50 controller supports up to 50
access points. Therefore, a mobility group consisting of 12 4402-25 controllers and 12 4402-50
controllers supports up to 900 access points (12 * 25 + 12 * 50 = 300 + 600 = 900 access points).
Mobility groups enable you to limit roaming between different floors, buildings, or campuses in the same
enterprise by assigning different mobility group names to different controllers within the same wireless
network. Figure 11-5 shows the results of creating distinct mobility group names for two groups of
controllers.
Figure 11-5 Two Mobility Groups
The controllers in the ABC mobility group recognize and communicate with each other through their
access points and through their shared subnets. The controllers in the ABC mobility group do not
recognize or communicate with the XYZ controllers, which are in a different mobility group. Likewise,
the controllers in the XYZ mobility group do not recognize or communicate with the controllers in the
ABC mobility group. This feature ensures mobility group isolation across the network.
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