Cisco 2100 Series Configuration Manual page 591

Chapter 11 Configuring Radio Resource ManagementWireless Device Access
The DCA sensitivity thresholds vary by radio band, as noted in
Table 11-2
Option
High
Medium
Low
config advanced 802.11a channel dca chan-width-11n {20 | 40}—Configures the DCA channel
•
width for all 802.11n radios in the 5-GHz band, where
–
–
Note
• config advanced {802.11a | 802.11b} channel foreign {enable | disable}—Enables or disables
foreign access point interference avoidance in the channel assignment.
• config advanced {802.11a | 802.11b} channel load {enable | disable}—Enables or disables load
avoidance in the channel assignment.
config advanced {802.11a | 802.11b} channel noise {enable | disable}—Enables or disables noise
•
avoidance in the channel assignment.
config advanced {802.11a | 802.11b} channel update—Initiates an update of the channel selection
•
for every Cisco access point.
Use these commands to configure coverage hole detection:
Step 5
Note
OL-17037-01
DCA Sensitivity Thresholds
2.4-GHz DCA Sensitivity Threshold 5-GHz DCA Sensitivity Threshold
5 dB
15 dB
30 dB
20 sets the channel width for 802.11n radios to 20 MHz. This is the default value.
40 sets the channel width for 802.11n radios to 40 MHz.
If you choose 40, be sure to set at least two adjacent channels in the config advanced
Note
802.11a channel {add | delete} channel_number command in
primary channel of 36 and an extension channel of 40). If you set only one channel, that
channel is not used for 40-MHz channel width.
If you choose 40, you can also configure the primary and extension channels used by
Note
individual access points. Refer to the
Transmit Power Settings" section on page 11-30
To override the globally configured DCA channel width setting, you can statically configure
an access point's radio for 20- or 40-MHz mode using the config 802.11a chan_width
Cisco_AP {20 | 40} command. If you ever then change the static configuration to global on
the access point radio, the global DCA configuration overrides the channel width
configuration that the access point was previously using. It can take up to 30 minutes
(depending on how often DCA is configured to run) for the change to take effect.
In controller software release 5.2, you can disable coverage hole detection on a per-WLAN
basis. See the "Disabling Coverage Hole Detection per WLAN" section on page 6-54
information.
Table 11-2.
5 dB
20 dB
35 dB
"Using the CLI to Statically Assign Channel and
for configuration instructions.
Cisco Wireless LAN Controller Configuration Guide
Configuring RRM
Step 3 (for example, a
for more
11-21