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Cisco Wireless ISR and HWIC Access Point Configuration Guide
OL-6415-04
Chapter 2 Configuring Radio Settings
Enabling and Disabling World Mode

Confirming that DFS is Enabled

Use the show controller dot11radio1 command to confirm that DFS is enabled. This example shows a
line from the output for the show controller command for a channel on which DFS is enabled:
Current Frequency: 5300 MHz Channel 60 (DFS enabled)

Blocking Channels from DFS Selection

If your regulatory domain limits the channels that you can use in specific locations--for example, indoors
or outdoors--you can block groups of channels to prevent the access point from selecting them when DFS
is enabled. Use this configuration interface command to block groups of channels from DFS selection:
[no] dfs band [1] [2] [3] [4] block
The 1, 2, 3, and 4 options designate blocks of channels:
• 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.
• 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:
router(config-if)# dfs band 1 2 block
This example shows how to unblock frequencies 5.150 to 5.350 for DFS:
router(config-if)# no dfs band 1 2 block
This example shows how to unblock all frequencies for DFS:
router(config-if)# no dfs band block
Enabling and Disabling World Mode
You can configure the wireless device to support 802.11d world mode or Cisco legacy world mode.
When you enable world mode, the wireless device adds channel carrier set information to its beacon.
Client devices with world mode enabled receive the carrier set information and adjust their settings
automatically. For example, a client device used primarily in Japan could rely on world mode to adjust
its channel and power settings automatically when it travels to Italy and joins a network there. Cisco
client devices running firmware version 5.30.17 or later detect whether the wireless device is using
802.11d or Cisco legacy world mode and automatically use world mode that matches the mode used by
the wireless device. World mode is disabled by default.