Cisco Aironet CB21AG Installation And Configuration Manual page 132

Setting Roaming Parameters in the Windows Control Panel
Table 5-5
Parameter
BSS Aging Interval
Scan Valid Interval
The default configuration of the client adapter software is optimized for high throughput and the lowest
power consumption. However, in some environments, this configuration can cause the client adapter to
unnecessarily stay with the currently associated access point longer than necessary.
If your application requires a faster roaming response, configure the BSS Aging Interval and Scan Valid
Interval parameters as follows:
Set the BSS Aging Interval parameter to 20
•
Set the Scan Valid Interval parameter to 20
•
If you are using client software prior to 2.7.0.2, you will not be able to set the BSS Aging Interval
Note
parameter to 20. In that case, set it to 30.
Cisco Aironet 802.11a/b/g Wireless LAN Client Adapters (CB21AG and PI21AG) Installation and Configuration Guide
5-64
Roaming Parameters (in the Windows Control Panel)
Description
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
Cisco recommends that you set the BSS Aging Interval to twice
Note
the value of the Scan Valid Interval. For example, if the Scan
Valid Interval is 50, the BSS Aging Interval would be 100.
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
The client does not scan for a new access point as long as it has
Note
a good connection and is passing data.
Wireless Mode
5 GHz, 54 Mbps or
2.4 GHz, 54 Mbps
2.4 GHz, 11 Mbps
(other modes enabled)
2.4 GHz, 11 Mbps
(only mode enabled)
Chapter 5 Configuring the Client Adapter
Signal Strength Transmit Rate
Threshold (dBm) Threshold (Mbps)
24
24
24
24
9
5
OL-4211-05