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5/26/05 Cisco WLAN Solution Mobility Group
OL-7426-03
About Cisco WLAN Solution Mobility GroupsCisco WLAN Solution Mobility Group
Cisco WLAN Solution operators can define Mobility Groups to allow client roaming across groups of
Cisco Wireless LAN Controllers. Because the Cisco Wireless LAN Controllers in Multiple-Cisco Wireless
LAN Controller Deployments can detect each other across the network and over the air, it is important
that each enterprise, institution, and wireless internet service provider isolate their Cisco Wireless LAN
Controllers. The Operating System makes it easy for operators to create this isolation by allowing them
to assign a Mobility Group Name to their Cisco Wireless LAN Controllers. This assignment can be made
using the Web User Interface
, the Cisco Wireless Control System, or the Command Line Interface.
Before clients can roam, they are automatically associated with their original, or anchor, Cisco Wireless
LAN Controller. This anchor Cisco Wireless LAN Controller maintains the client information and ensures
that the client remains connected with the same IP address across all handoffs for the duration of the
client session.
Note that all the Cisco Wireless LAN Controllers in a Mobility Group must use the same LWAPP Layer 2
and Layer 3 LWAPP Operation, or you will defeat the Mobility software algorithm.
The following figure shows the results of creating Mobility Group Names for two groups of Cisco
Wireless LAN Controllers. The Cisco Wireless LAN Controllers in the ABC Mobility Group recognize and
communicate with each other through their Cisco 1000 Series Lightweight Access Points and through
their shared subnets, but the ABC Mobility Group tags the XYZ Cisco 1000 Series lightweight access
points as Rogue Access Points
. Likewise, the Cisco Wireless LAN Controllers in the XYZ Mobility Group
do not recognize or communicate with the Cisco Wireless LAN Controllers in the ABC Mobility Group.
This feature ensures Mobility Group isolation across the network.
Figure - Typical Cisco WLAN Solution Mobility Group Name Application