Hi Ahmed,
To support roaming for the 7920, you should probably look into setting up WDS. Have a look at the following;
Wireless Domain Services (WDS) act as a central authentication entity that supports a fast client rekey, rather than requiring a full RADIUS reauthentication each time the client roams. All access points and clients in a L2 domain 802.1X authenticate to a RADIUS server via the WDS that performs the role of 802.1X authenticator. Because all clients and access points authenticate via the WDS, the WDS is able to establish shared keys between itself and every other entity in the L2 domain. These shared keys enable CCKM fast secure roaming.One of the main purposes of WDS is to cache the user credentials as soon as the authentication server authenticates the client for the first time. On subsequent attempts, WDS authenticates the client on the basis of the cached information.
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps4570/prod_technical_reference09186a00801c5223.html#wp39351
The WDS device performs these tasks on your WLAN:
Registers all client devices in the subnetwork, establishes session keys for the client devices, and caches the client security credentials. When a client roams to another AP, the WDS device forwards the client security credentials to the new AP.
From this excellent doc;
Wireless Domain Services FAQ
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00804d4421.shtml#intro
Wireless Domain Services Configuration
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_example09186a00801c951f.shtml#step1
Hope this helps!
Rob
Please remember to rate helpful posts.....
