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Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
OL-4211-03
Chapter 5 Configuring the Client Adapter
Setting Roaming Parameters in the Windows Control Panel
Table 5-5 Roaming Parameters (in the Windows Control Panel)
Parameter Description
BSS Aging Interval The amount of time (in seconds) that the client keeps an access point in
its roaming scanlist after it can no longer communicate to that device.
The higher the value, the greater the number of access points to which
the client may roam.
Range: 20 to 300 seconds (in 10-second increments)
Default: 120 seconds
Note Cisco recommends that you set the BSS Aging Interval to twice
the value of the Scan Valid Interval. For example, if the Scan
Valid Interval is 50, the BSS Aging Interval would be 100.
Scan Valid Interval The amount of time (in seconds) before the client starts scanning for a
better access point after reaching the roaming threshold or missing
beacons. (See the threshold criteria in the table below.) The higher the
value, the less time the client spends scanning for a better access point
and the more time it has to send data.
Range: 20 to 120 seconds (in 5-second increments)
Default: 60 seconds
Note The client does not scan for a new access point as long as it has
a good connection and is passing data.
Wireless Mode
Signal Strength
Threshold (dBm)
Transmit Rate
Threshold (Mbps)
5 GHz, 54 Mbps or
2.4 GHz, 54 Mbps
24 24
2.4 GHz, 11 Mbps
(other modes enabled)
24 9
2.4 GHz, 11 Mbps
(only mode enabled)
24 5