Solved: Cisco 9120 AP LED continuously blinking After successfully on 9800 WLC

rahulnaik · ‎06-14-2025

Hi Community,

We are experiencing an issue with Cisco 9120 Access Points after migrating them from an EWC setup to a centralized Cisco 9800 WLC running IOS-XE version 17.9.6. The APs have successfully joined the new WLC, and end users are able to connect to the Wi-Fi network without any issues. However, the LED on the APs continues to blink instead of displaying the expected solid green or operational status.

rahulnaik · ‎06-16-2025

Hi @Leo Laohoo & @Rich R

Thank you for your replies.

The issue has been resolved. LLDP was disabled on the PoE switch. After enabling LLDP, the AP LED is now stable as expected.

View solution in original post

Leo Laohoo · ‎06-14-2025

CSCwh38810

Rich R · ‎06-15-2025

Also note that 17.9 has passed End of SW Maintenance Releases Date so you should be planning to migrate to a new extended support release like 17.12 or 17.15. Refer to the TAC Recommended link below.

While remaining on 17.9 you should at least be considering the latest 17.9 release 17.9.7 for numerous bug fixes.
And while you are still on 17.9.6 have you installed the latest APSP3?

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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

rahulnaik · ‎06-16-2025

Hi @Leo Laohoo & @Rich R

Thank you for your replies.

The issue has been resolved. LLDP was disabled on the PoE switch. After enabling LLDP, the AP LED is now stable as expected.