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force to run 52 channel in 802.1a


Is it possible to force LAP running with channel 52, 56,60 or 64?

I have configured LAP running channel 36 - 48 statically, using WLC.

But I cannot configure statical 52 channel for my LAP in lab.

Thank you for your advice.

Kawakami in Tokyo

Scott Fella
Hall of Fame Guru

Are those channels allowed? This depends on the regulatory domain for the access point. I would verify that first.

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That channel is a DFS (Dynamic Frequency Selection) Channel.  The DFS Channels are suceptible to radar interferrence and can not be hard set.  If the AP hears radar on those channels it has to be able to move away.


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HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered


Thank you for your help. In Japan, channel 52 - 64 is allowed as DFS channel, as Stephen says.

I hear that WLAN AP has to check if there is radar or not before running with DFS channel.  Can you configure to run DFS channel statically for Cisco AP?



I don't really understand your question, but if the channel is allowed by your AP's country code, you can configure it. Can you tell the ap not to use DFS, you can turn off DFS but you can block certain channels.

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Thank you for the info. Let me confirm. Can I change LAP config throght console?



what is the AP model?

please attach show version


Thank you for your help. AP is Aironet 3502. I will post show version later.



Please find attached show version for the AP.

I found "dfs band" command is not allowed in dot11radio interface for the AP.

I wonder if it is because old IOS version or WLC environment. I am confused.

I would appreciate any advice. Thank you.


AP-KYO-0002#sh ver

Cisco IOS Software, C3500 Software (AP3G1-K9W8-M), Version 12.4(23c)JA2, RELEASE SOFTWARE (fc3)

Technical Support:

Copyright (c) 1986-2011 by Cisco Systems, Inc.

Compiled Wed 13-Apr-11 12:20 by prod_rel_team

ROM: Bootstrap program is C3500 boot loader

BOOTLDR: C3500 Boot Loader (AP3G1-BOOT-M) Version 12.4(23c)JA, RELEASE SOFTWARE (fc3)

AP-KYO-0002 uptime is 1 hour, 2 minutes

System returned to ROM by reload

System image file is "flash:/ap3g1-k9w8-mx.124-23c.JA2/ap3g1-k9w8-mx.124-23c.JA2"

Last reload reason:

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco AIR-CAP3502I-Q-K9    (PowerPC460exr) processor (revision A0) with 81910K/49152K bytes of memory.

Processor board ID FGL1527S1EB

PowerPC460exr CPU at 666Mhz, revision number 0x18A8

Last reset from reload

LWAPP image version

1 Gigabit Ethernet interface

2 802.11 Radio(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 30:E4:DB:45:4B:9A

Part Number                          : 73-12175-05

PCA Assembly Number                  : 800-32268-05

PCA Revision Number                  : A0

PCB Serial Number                    : FOC15244WDS

Top Assembly Part Number             : 800-32891-01

Top Assembly Serial Number           : FGL1527S1EB

Top Revision Number                  : A0

Product/Model Number                 : AIR-CAP3502I-Q-K9  

Configuration register is 0xF


the AP is lightweight mode AP.

so you should do everything from the controller.

You can statically configure a DFS channel. When the AP detects radar on that channel , it will stop servicing clients on that channel and exclude it for 30 minutes. A new channel will be selected from the DCA channel list, even if the channel has been configured statically.

having a limited list of channels from which the new channel will be selected depends on the regulatory domain and the DCA channel list configuration.

So ,the second place to tune the selection is under the DCA channel list configuration.


Please make sure to rate correct answers

Abhishek Abhishek
Cisco Employee


Thank you for your help.

I tried to change channel for the LAP 3502 using WLC, referring to below;

On GUI, "custom" radio button and following drop-down field shows only 36, 40, 44 and 48 channel.

On CLI, "config 802.11a channel ap (AP name) 52" command returns "unable to set channel."

How do I troublleshoot the reason?



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