topic Re: Channel 48 - WLC 5520 in Wireless

Channel 48 - WLC 5520

wifi1 — Wed, 15 Jun 2022 15:20:27 GMT

Hi all

I have an issue where I am unable to remove channel 48 under the RF-profile and at the moment I am statically assigning channels to APs inside this group (as channel 48 is causing interference with a third party system).

When I try and remove the channel I just receive an error stating "Invalid channel or channel cannot be removed"

Has anyone come across this issue before? Any input would be a great help.

Currently running 2x5520 WLC in SSO mode on OS version 8.10.162.0

Thank you,

Re: Channel 48 - WLC 5520

Flavio Miranda — Wed, 15 Jun 2022 15:39:32 GMT

Which is the channel width are you using? If you have 40Mhz channel, which means two channel bonding , You may have to delete both channels.

Re: Channel 48 - WLC 5520

wifi1 — Wed, 15 Jun 2022 20:01:16 GMT

Hi Flavio

Yes I am using 40mhz bonding. So I should need to delete 48 and 52?

I’ll give that a try

thanks

Re: Channel 48 - WLC 5520

Flavio Miranda — Wed, 15 Jun 2022 20:17:27 GMT

That´s correct.

Re: Channel 48 - WLC 5520

wifi1 — Fri, 24 Jun 2022 11:06:46 GMT

Hi Flavio.

This still does not work for me unfortunately - do you have any other suggestions?

(WLC) >show rf-profile details 5g-production

DCA Channel List................................. 48,56,60,64,100,104,108,112,116,120,124,128,132
DCA Bandwidth.................................... 20

(WLC) >config rf-profile channel delete 48 5g-production
Invalid channel or channel cannot be removed.

Globally all channels are enabled and 20MHz channel width.

Thanks,

Re: Channel 48 - WLC 5520

Flavio Miranda — Fri, 24 Jun 2022 11:21:56 GMT

There are some bug with similar behavior. Probably you hit a bug. I´d try to change the WLC version cause this should work.

Just for test, did you tried to delete another channel?

Re: Channel 48 - WLC 5520

wifi1 — Fri, 24 Jun 2022 11:41:36 GMT

I was thinking that it could well be some bug - I can delete any channel except for channel 48.

Thanks

Re: Channel 48 - WLC 5520

michael18 — Tue, 10 Jun 2025 10:49:01 GMT

I came across this post while investigating a similar issue. I found the solution to this via TAC. I thought i'd chare in case anyone else has this problem.

Wireless > 802.11a > RRM > DCA, just check "Avoid check for non-DFS channel" and then remove the channel.

After I enabled the above check box I was able to go back to RF profile and remove channel 48. I then went to the above check box and disabled it again. This solved the problem.