Solved: Re: WLC code compatibility with AP C9136I-B - Page 2

Najib Akbari · ‎07-31-2026

Hi,

I have bunch of AP C9136I-B on C9800 code 17.12.6a and the controller warning message saying the current code does not support 2nd radio to be enabled. i can only upgrade up to 17.12.7a for a while as we have 3700 APs too.

I need your advise :

- is the second radio very important on performance and coverage to be enabled? elaborate a bit on the fundamental of this type of radio

- whats best to do? a work around or something?

Rich R · ‎08-03-2026

Yes as Mark says they will work with all 17.12.x releases - it's just that they were officially end of support after 17.12.3 but Cisco has not removed them from the 17.12 code yet (and are unlikely to do so).

You can check/confirm which APs are supported on the WLC with "show ap image file summ" - that lists all the supported AP models with the corresponding images. If you have an APSP installed it also shows you the base image versions and the APSP image versions.

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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
Field Notice: FN74383 APs Running 17.12.4/5/6/6a May Run Out of Flash Space Preventing Upgrades
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
AP supported channel lookup: https://apchannels.cisco.com/