Solved: Cisco 9800-40 WLC (9120ax AP's not connecting)

Jay233 · ‎11-02-2022

Hi All,

I'm in the middle of an upgrade from 5520/3802 to 9800/9120, all was fine until a batch of 9120 AP's will not connect to the 9800 WLC, looks like the "latest batch of 9120's have been shipped with AP Running Image: 17.6.4.56" where my 9800 WLC is running 17.6.1

Looks like I need Cisco IOS XE Bengaluru 17.6.4 on the WLC to support 17.6.4.56 15.3(3)JPK5

Tried looking for the 9120AXI 17.6.1.13 AP image, can someone point me in the right direction please. Obviously I can upgrade the 9800's but just wanted to test I.E. downgrade a new AP from 17.6.4.56 to 17.6.1.13 and verify it connects to the controller.

Cheers,

Leo Laohoo · ‎11-02-2022

@Jay233 wrote:
"latest batch of 9120's have been shipped with AP Running Image: 17.6.4.56"

FN - 72424 - Later Versions of Some Wi-Fi 6 Access Points Fail to Join the WLAN Controller

View solution in original post

Leo Laohoo · ‎11-02-2022

@Jay233 wrote:
"latest batch of 9120's have been shipped with AP Running Image: 17.6.4.56"

FN - 72424 - Later Versions of Some Wi-Fi 6 Access Points Fail to Join the WLAN Controller

Rich R · ‎11-03-2022

In other words - no you can't downgrade the APs - you must upgrade your 9800 to 17.6.4 (should be anyway for the fixes).

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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