12-6
Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 12 Configuring Mobility GroupsWireless Device Access
Overview of Mobility Groups
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 12-5 shows the results of creating distinct mobility group names for two groups of
controllers.
Figure 12-5 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.
Controllers can communicate across mobility groups and clients may roam between access points in
different mobility groups, provided that the controllers are included in each other’s mobility lists. A
mobility list is a list of controllers configured on a controller that specifies members in different mobility
groups. In the following example, controller 1 can communicate with either controller 2 or 3, but
controller 2 and controller 3 can communicate only with controller 1 and not with each other. Similarly,
clients can roam between controller 1 and controller 2 or between controller 1 and controller 3 but not
between controller 2 and controller 3.
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