11-20
Cisco Wireless LAN Controller Configuration Guide
OL-17037-01
Chapter 11 Configuring Radio Resource ManagementWireless Device Access
Configuring RRM
• To manually change the default transmit power setting of –70 dBm, enter this command:
config advanced {802.11a | 802.11b} tx-power-control-thresh threshold
where threshold is a value from –50 to –80 dBm. Increasing this value (between –50 and –65 dBm)
causes the access points to operate at higher transmit power rates. Decreasing the value has the
opposite effect.
In applications with a dense population of access points, it may be useful to decrease the threshold
to –75 or –80 dBm in order to reduce the number of BSSIDs (access points) and beacons seen by
the wireless clients. Some wireless clients may have difficulty processing a large number of BSSIDs
or a high beacon rate and may exhibit problematic behavior with the default threshold.
Note See the Power Threshold description in “Using the GUI to Configure Transmit Power
Control” section on page 11-10 for more information.
Step 3 Perform one of the following to configure dynamic channel assignment (DCA):
• To have RRM automatically configure all 802.11a or 802.11b/g channels based on availability and
interference, enter this command:
config {802.11a | 802.11b} channel global auto
• To have RRM automatically reconfigure all 802.11a or 802.11b/g channels one time based on
availability and interference, enter this command:
config {802.11a | 802.11b} channel global once
• To disable RRM and set all channels to their default values, enter this command:
config {802.11a | 802.11b} channel global off
• To specify the channel set used for DCA, enter this command:
config advanced {802.11a | 802.11b} channel {add | delete} channel_number
You can enter only one channel number per command. This command is helpful when you know that
the clients do not support certain channels because they are legacy devices or they have certain
regulatory restrictions.
Step 4 Use these commands to configure additional DCA parameters:
• config advanced {802.11a | 802.11b} channel dca anchor-time value—Specifies the time of day
when the DCA algorithm is to start. Val ue is a number between 0 and 23 (inclusive) representing the
hour of the day from 12:00 a.m. to 11:00 p.m.
• config advanced {802.11a | 802.11b} channel dca interval value—Specifies how often the DCA
algorithm is allowed to run. Val u e is one of the following: 1, 2, 3, 4, 6, 8, 12, or 24 hours or 0, which
is the default value of 10 minutes (or 600 seconds).
• config advanced {802.11a | 802.11b} channel dca sensitivity {low | medium | high}—Specifies
how sensitive the DCA algorithm is to environmental changes such as signal, load, noise, and
interference when determining whether to change channel.
–
low means that the DCA algorithm is not particularly sensitive to environmental changes.
–
medium means that the DCA algorithm is moderately sensitive to environmental changes.
–
high means that the DCA algorithm is highly sensitive to environmental changes.
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