topic "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250 in ExtremeCloud IQ

"Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

markus_dach — Thu, 24 Feb 2022 13:44:21 GMT

Dear Community,
i have some configuration issues with dual 5G Configuration on AP250 firmware is 10.4.3.0.
While running Wifi1 on 20 MHz UNII-1 Channel i want to operate Wifi0 und 40 MHz UNII-3 Channels.
Nevertheless wich channel i select on Wifi0, i will receive an error Message like:

Invalid channel 151 for checking interference.

Any idea on how to troubleshoot this?

Best Regards,
Markus

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

SamPirok — Thu, 24 Feb 2022 18:26:07 GMT

Hi Markus, are you seeing that error in the GUI or in the CLI, or somewhere else? Also do you have DFS channels enabled in the Radio Profile?

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

markus_dach — Fri, 25 Feb 2022 11:41:11 GMT

Hi Sam,
i see this on the GUI while saving a manual channel assignement to the Radio.
DFS is enabled while all UNII-1 Channels are excluded on this Radio and the only allowed on the other.
However, same issue appeard also when only UNII-3 Channels assigned to the profile.

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

SamPirok — Fri, 25 Feb 2022 19:11:02 GMT

Thank you again for your patience here, I think I may have found the issue. When using dual 5ghz radios, acsp uses 60 MHz of separation. I think since the wifi1 radio is set to use UNII-2 channels, we are too close to that range when we select UNII-3 channels. Would you be able to test that theory?

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

markus_dach — Wed, 02 Mar 2022 21:31:04 GMT

Hi Sam, no, the Wifi1 Radio is set to use only UNII-1 Channels.
- i do not believe 60 Mhz is enough within one AP to separate all interference because of the edge steepness and the extreme close distance and therefore always try to spread the channels as far as possible 😉

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

SamPirok — Wed, 02 Mar 2022 21:42:22 GMT

Hey Markus, sorry about that, you stated you were using UNII-1 channels for wifi1 in your first post. My apologies, I misread it originally. I will continue looking in to this for you, thanks for bearing with me here.

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

SamPirok — Thu, 10 Mar 2022 19:56:19 GMT

Thanks again for your patience, I've been reviewing this issue with some XIQ techs and one of them asked what country code your APs are using, could you check that for us? You can see this in the CLI using the command "show boot-param". The XIQ GUI will also show a country code in the Mange> Devices page, but since it's throwing some odd errors for us right now, I'd rather know what the AP CLI says if possible.

Re: "Invalid channel $$ for checking interference" Error message while saving dual 5 GHz radio configuration on AP250

markus_dach — Mon, 21 Mar 2022 11:21:34 GMT

Hi Sam, sorry for the delay!

Region Code:        EU
Country Code:       276

The APs are set to German CC.