topic Re: 5Ghz DCA in Wireless

5Ghz DCA

hs08 — Thu, 05 Jun 2025 04:01:32 GMT

I have wlc 2504 and C9800, both WLC use same country.

In WLC C9800 i can see i have channel under 100

But why in WLC 2504 i only have channel above 100?

Re: 5Ghz DCA

Leo Laohoo — Thu, 05 Jun 2025 04:13:28 GMT

1. Depending on what country the APs are, avoid enabling UNII-2e channels because this is in the same frequency as Doppler radars.

2. And just because the WLC is configured for UNII-3 (the one from AireOS), there is a growing trend to use WiFi-based motion sensors and they predominantly are on UNII-3 channels.

3. As to why the AireOS controller is only configured for UNII-3, nobody knows, however, if this controller is configured for 40 Mhz channel width (and above), 5.0 Ghz would be totally useless.

Re: 5Ghz DCA

Saikat Nandy — Thu, 05 Jun 2025 09:24:41 GMT

Can I have the output 'show run-config' from 2504.

Re: 5Ghz DCA

hs08 — Thu, 05 Jun 2025 09:36:30 GMT

Send to you by DM. Thanks

Re: 5Ghz DCA

Saikat Nandy — Thu, 05 Jun 2025 10:41:05 GMT

Thanks @hs08 . here is the answer to your query.

The country code set in the WLC is Indonesia. Historically Indonesia had limitation with the number of allowed channels in 5Ghz. It's been few years since that has been lifted. Previously only UNII-3 channel (from 149 onwards) were allowed. But it has been changed. This is the reason why you are seeing the discrepancy. Here are the few docs/community blogs to refer -
https://discussions.apple.com/thread/252441216?sortBy=rank
https://community.intel.com/t5/Wireless/Regulatory-update-for-Indonesia-channels-36-40/td-p/1585811
Hope this helps.

Re: 5Ghz DCA

hs08 — Thu, 05 Jun 2025 10:51:29 GMT

but why in my WLC9800 with same country i get channel under 100?

Re: 5Ghz DCA

Saikat Nandy — Thu, 05 Jun 2025 11:04:23 GMT

cz 9800 is new and have the latest codes. I have tested a 3504 on 8.10 version and can see UNII-I/II/III channels. So it's the old code at this point.

Re: 5Ghz DCA

hs08 — Thu, 05 Jun 2025 11:08:35 GMT

so it's depend on WLC software version right? Currently i use version 8.5.182.0 and this is latest version in cisco if i check now.

Re: 5Ghz DCA

Mark Elsen — Thu, 05 Jun 2025 11:32:56 GMT

- @hs08 Ref : https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html
Latest version is 8.5.182.12 for 2504 : ==> https://software.cisco.com/download/specialrelease/9a6a7cf84f9fdf04b95c76e2ac7820e7

Re: 5Ghz DCA

Scott Fella — Thu, 05 Jun 2025 14:00:47 GMT

Keep in mind that when a code version is released it has what is allowed at that point in time. If there is any change to channels, like in your case from the regulatory domain, then later code version will make that change then. So take a look at when your AireOS code and your 9800 code was released, because things do change. This also goes for features and support of features. This is something you will see more as AireOS is no longer being developed and folks start or have implemented the 9800's alongside their existing AireOS controllers.

Re: 5Ghz DCA

hs08 — Thu, 05 Jun 2025 14:03:24 GMT

Thanks @Mark Elsen

Strange, if i search manually for 2504 i'm only can see 8.5.182.0 is latest version.

Re: 5Ghz DCA

Scott Fella — Thu, 05 Jun 2025 14:08:18 GMT

@hs08 that is because the latest version for the 2504 is 8.5.x

Re: 5Ghz DCA

Mark Elsen — Thu, 05 Jun 2025 14:14:36 GMT

- @hs08 - The version I mentioned from the recommended releases document is the effective last version for the 2504 controller. Cisco should be consistent and when they advertise a last release for a retiring platform and they should offer that version in Software Downloads too!

Re: 5Ghz DCA

Saikat Nandy — Thu, 05 Jun 2025 17:41:00 GMT

@hs08 @Mark Elsen if you are looking for 8.5.182.12, here is the link for you - https://software.cisco.com/download/specialrelease/9a6a7cf84f9fdf04b95c76e2ac7820e7
Just to clarify one more thing - if you are under the assumption that .12 will help you getting more channels for ID, then it is wrong. 182.12 is an engineering special and has some specific bug fixes. Your WLC is already on .182 and you are not seeing all the channels. Which means .12 will also not help you here.

Re: 5Ghz DCA

Rich R — Mon, 09 Jun 2025 07:56:47 GMT

The problem here @hs08 is that you are using an End of Support product with End of Support software.
https://www.cisco.com/c/en/us/products/collateral/wireless/2504-wireless-controller/eos-eol-notice-c51-740645.html
https://www.cisco.com/c/en/us/products/collateral/wireless/8500-series-wireless-controllers/bulletin-c25-744139.html
Like Scott says it only supports what was allowed around the time 8.5 was released (2017) which is a long time ago now. Regulatory changes in software often take a while after the actual regulatory changes and usually only get integrated in the next feature release of software, not in maintenance releases (bug fixes) although there are exceptions sometimes.

Re: 5Ghz DCA

Rich R — Mon, 09 Jun 2025 08:25:14 GMT

8.5.182.12 is a special engineering release which is why it is not on the general downloads page - although agreed with @Mark Elsen that it really should be because it is the last publicly available release for 2504.

But also as @Mark Elsen said - you should always refer to the TAC Code recommendations (linked in my signature below, and in all my posts)
Recommended AireOS Wireless LAN Controller Releases - AireOS 8.5