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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-29225-01
Chapter 6 Configuring Radio Settings
Configuring Radio Channel Settings
Confirming that DFS is Enabled
Use the show controllers dot11radio1 command to confirm that DFS is enabled. The command also
includes indications that uniform spreading is required and channels that are in the non-occupancy
period due to radar detection.
This example shows a line from the output for the show controller command for a channel on which DFS
is enabled. The indications listed in the previous paragraph are shown in bold:
ap#show controller dot11radio1
!
interface Dot11Radio1
Radio AIR-RM1251A, Base Address 011.9290ec0, BBlock version 0.00, Software version 6.00.0
Serial number FOCO83114WK
Number of supported simultaneous BSSID on Dot11Radio1: 8
Carrier Set: Americas (OFDM) (US )
Uniform Spreading Required: Yes
Current Frequency: 5300 MHz Channel 60 (DFS enabled)
Current Frequency: 5300 MHz Channel 60 (DFS enabled)
Allowed Frequencies: 5180(36) 5200(40) 5220(44) 5240(48) *5260(52) *5280(56) *53
00(60) *5320(64) *5500(100) *5520(104) *5540(108) *5560(112) *5580(116) *5660(13
2) *5680(136) *5700(140) 5745(149) 5765(153) 5785(157) 5805(161)
* = May only be selected by Dynamic Frequency Selection (DFS)
Listen Frequencies: 5170(34) 5190(38) 5210(42) 5230(46) 5180(36) 5200(40) 5220(4
4) 5240(48) 5260(52) 5280(56) 5300(60) 5320(64) 5500(100) 5520(104) 5540(108) 55
60(112) 5580(116) 5600(120) 5620(124) 5640(128) 5660(132) 5680(136) 5700(140) 57
45(149) 5765(153) 5785(157) 5805(161) 5825(165)
DFS Blocked Frequencies: none
Beacon Flags: 0; Beacons are enabled; Probes are enabled
Current Power: 17 dBm
Allowed Power Levels: -1 2 5 8 11 14 15 17
Allowed Client Power Levels: 2 5 8 11 14 15 17
...
Configuring a Channel
Use the channel command to configure a channel. The command for the interface is modified to only
allow you to select a specific channel number and to enable DFS.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio1 dfs Enter the configuration interface for the 802.11a radio