Specifications

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Cisco IOS Command Reference for Cisco Aironet Access Points and Bridges
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Chapter 2 Cisco IOS Commands for Access Points and Bridges
channel
channel
Use the channel configuration interface command to set the radio channel frequency and the 802.11n
radio channel width. Use the no form of this command to reset the channel frequency to defaults.
[no] channel {number | frequency | least-congested | width [20] [40-above] [40-below] | dfs}
802.11n allows both 20-MHz and 40-Mhz channel widths consisting of 2 contiguous non-overlapping
channels (for example, 2.4-GHz channels 1 and 6)
Note This command is disabled on 5-GHz radios that support Dynamic Frequency Selection (DFS). All
5-GHz radios configured at the factory for use in the European Union and Signapore support DFS.
Radios configured for use in other regulatory domains do not support DFS.
Syntax Description number Specifies a channel number. For a list of channels for the 2.4-GHz radio, see
Table 2-1. For a list of channels for the 5-GHz radio, see Table 2-2.
Note The valid numbers depend on the channels allowed in your regulatory
region and are set during manufacturing. For additional information,
refer to the hardware installation guide for your access point or
bridge.
frequency Specifies the center frequency for the radio channel. For a list of center
frequencies for the 2.4-GHz access point radio, see
Table 2-1. For a list of
center frequencies for the 5-GHz access point radio, see Table 2-2. For a list
of center frequencies for the 5-GHz bridge radio, see Table 2-3.
Note The valid frequencies depend on the channels allowed in your
regulatory region and are set during manufacturing. For additional
information, refer to the hardware installation guide for your access
point or bridge.
least-congested Enables or disables the scanning for a least busy radio channel to
communicate with the client adapter
width [20] [40-above]
[40-below]
Specifies a channel width. One of the 20-MHz channels is called the control
channel. Legacy clients and 20-MHz high throughput clients use the control
channel. Beacons can only be sent on this channel. The second 20-MHz
channel is called the extension channel. 40-MHz stations may use this channel
and the control channel simultaneously.
Use the width option to specify a bandwidth to use. This option is available
for the 1250 series access point and consists of three available settings: 20,
40-above, and 40-below. Choosing 20 sets the channel width to 20 MHz.
Choosing 40-above sets the channel width to 40 Mhz with the extension
channel above the control channel. Choosing 40-below sets the channel width
to 40 MHz with the extension channel below the control channel.
dfs Enables Dynamic Frequency Selection.