Cisco Cisco Aironet 350 Wireless LAN Client Adapter

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This section describes new and changed information for Cisco Aironet client adapter firmware version 
5.20.17.

Some applications that run on a client device may require fast roaming between access points. Voice 
applications, for example, require seamless roaming to prevent delays and gaps in conversation. Support 
for fast secure roaming is now available for LEAP-enabled clients in client adapter firmware version 
5.20.17.

During normal operation, LEAP-enabled clients mutually authenticate with a new access point by 
performing a complete LEAP authentication, including communication with the main RADIUS server. 
However, when you configure your wireless LAN for fast secure roaming, LEAP-enabled clients 
securely roam from one access point to another without the need to reauthenticate with the RADIUS 
server. Using Cisco Centralized Key Management (CCKM), an access point that is configured for 
wireless domain services (WDS) uses a fast rekeying technique that enables client devices to roam from 
one access point to another in under 150 milliseconds (ms). Fast secure roaming ensures that there is no 
perceptible delay in time-sensitive applications such as wireless Voice over IP (VoIP), enterprise 
resource planning (ERP), or Citrix-based solutions.

This feature does not need to be enabled on the client adapter; it is supported automatically in client 
adapter firmware version 5.20.17. However, it must be enabled on the access point.

IOS release 12.2(11)JA or greater is required to enable fast secure roaming on the access point. Refer to 
the documentation for your access point for instructions on enabling this feature.

If the Microsoft 802.1X supplicant is installed on your computer, you must disable one or two Windows 
parameters in order for this feature to operate correctly. Refer to the 

 section of the 

Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Windows (version 
OL-1394-06) for details.