Unexpected channel shifts from configured channels in Cisco APs - Page 2

roshney-roy · ‎11-11-2024

Hi Experts,

We are using a licensed Cisco Catalyst 9800-CL Wireless Controller to manage our Cisco APs (models C9124AXE and AIR-AP1526E-Z-K9). According to our wireless network requirements, the channels on the APs are manually configured for both the bands(2.4 & 5 Ghz)

However, we are experiencing an issue where the AP channels are changing automatically despite the manual configuration. This is particularly noticeable with the 2.4 GHz channels, which tend to shift significantly.

We would appreciate any insights or suggestions on how to resolve this issue.

Thank you!

Regards,

Roshney Roy

Rich R · ‎11-17-2024

I suggest you go back to TAC in that case @roshney-roy

CSCwj08558 is tagged as Unreproducible which means TAC were not able to reproduce it in their lab and the software development is not working on a fix for it. Telling you to upgrade to 17.15.1 sounds like a wild shot in the dark hoping that that will fix it and I very much doubt that it will. Also that bug only mentions 2.4GHz channels - nothing about 5 GHz channels.

I'll repeat Scott's question which you did not actually answer: Why do you need static channel allocations?

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Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
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TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

roshney-roy · ‎11-20-2024

Hi Rich R,

TAC updated the case today with a response that they do not have a fix at the moment(though the firmware upgrade was given as a solution few days ago). Developers are working to find a fix for the issue.

I had replied to Scott "Yes, it is a requirement at the access end of 2.4ghz to make the channel static. "

Hope to find a fix soon!!

Rich R · ‎11-20-2024

> I had replied to Scott "Yes, it is a requirement at the access end of 2.4ghz to make the channel static. "

That does not say why you have that requirement - just repeats that you have it.

------------------------------
Please click Helpful if this post helped you and Select as Solution (drop down menu at top right of this reply) if this answered your query.
------------------------------
TAC recommended codes for AireOS WLC's and TAC recommended codes for 9800 WLC's
Best Practices for AireOS WLC's, Best Practices for 9800 WLC's and Cisco Wireless compatibility matrix
Check your 9800 WLC config with Wireless Config Analyzer using "show tech wireless" output or "config paging disable" then "show run-config" output on AireOS and use Wireless Debug Analyzer to analyze your WLC client debugs
Field Notice: FN63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration
Field Notice: FN72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Required
Field Notice: FN72524 IOS APs stuck in downloading state after 4 Dec 2022 due to Certificate Expired
- Fixed in 8.10.196.0, latest 9800 releases, 8.5.182.12 (8.5.182.13 for 3504) and 8.5.182.109 (IRCM, 8.5.182.111 for 3504)
Field Notice: FN70479 AP Fails to Join or Joins with 1 Radio due to Country Mismatch, RMA needed
How to avoid boot loop due to corrupted image on Wave 2 and Catalyst 11ax Access Points (CSCvx32806)
Field Notice: FN74035 - Wave2 APs DFS May Not Detect Radar After Channel Availability Check Time
Leo's list of bugs affecting 2800/3800/4800/1560 APs
Default AP console baud rate from 17.12.x is 115200 - introduced by CSCwe88390

Leo Laohoo · ‎11-20-2024

@roshney-roy wrote:
Cisco TAC has identified the bug "CSCwj08558" and has recommeded a firmware upgrade (17.15.1)

Go back to Cisco TAC and get this case escalated to the BU &/or developers. "upgrade to 17.X.X" is not an acceptable solution/workaround.

Demand for an SMU or an APSP.