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Receiving the DOT11-6-FREQ_USED: Radio frequency [int] selected error message

Core Issue

After scanning for an unused Radio Frequency (RF), the unit selected the displays frequency.


The default behavior of an Access Point (AP) at bootup is to scan the RF spectrum for an unused frequency or channel. It then selects what appears to be the least congested channel.

This informational error message serves to let the user know which channel has been selected.

If you suspect RF congestion, you can run a carrier-busy test by issuing the following command at the Cisco IOS  Software command prompt:

ap# dot11 dot11Radio 0 carrier busy

Running this test disconnects all clients.

If the auto-selection of a channel does not suit your needs, you can use the results of this test to choose a channel to manually configure the radio interface to use. You can do this by issuing the following command:

ap(config)# int dot11radio 0
ap(config-if)# channel [number]

For more information, refer to the Configuring Radio Channel Settings section of Configuring Radio Settings.

Problem Type

Interference issues ( EMI / RF issues)

Error message


AP 1100

AP 1200

IOS Errors, Warnings, Statistics and Log Messages

DOT11-6-FREQ_USED: Radio frequency [int] selected

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 05:06 PM
Updated by: