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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-30644-01
Chapter 6 Configuring Radio Settings
Configuring Radio Channel Settings
• 1—Specifies frequencies 5.150 to 5.250 GHz. This group of frequencies is also known as the UNII-1
band.
• 2—Specifies frequencies 5.250 to 5.350 GHz. This group of frequencies is also known as the UNII-2
band.
• 3—Specifies frequencies 5.470 to 5.725 GHz. This group of frequencies is also known as UNII-2
extended.
• 4—Specifies frequencies 5.725 to 5.825 GHz. This group of frequencies is also known as the UNII-3
band.
This example shows how to prevent the access point from selecting frequencies 5.150 to 5.350 GHz
during DFS:
ap(config-if)# dfs band 1 2 block
This example shows how to unblock frequencies 5.150 to 5.350 for DFS:
ap(config-if)# no dfs band 1 2 block
This example shows how to unblock all frequencies for DFS:
ap(config-if)# no dfs band block
Setting the 802.11n Guard Interval
The 802.11n guard interval is the period in nanoseconds between packets. Two settings are available:
short (400ns) and long (800ns).
Beginning in privileged EXEC mode, follow these steps to set the 802.11n guard interval.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio {0 | 1} Enter interface configuration mode for the radio interface.
The 802.11n 2.4-GHz radio is radio 0
The 802.11n 5-GHz radio is radio 1.
Step 3
guard-interval {any | long} Enter a guard interval.
• any—allows the AP to use 400 ns with clients supporting
short GIs, and 800 ns with clients not supporting short GIs,
i.e. either the short (400ns) or long (800ns) guard interval.
• long—allows only the long (800ns) guard interval.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config
startup-config
(Optional) Save your entries in the configuration file.