WLC9800 freezing issue

eeebbunee · ‎10-06-2023

Hello Professionals,

From 2 days ago, my wireless controller (WLC9800-L) freezing suddenly.
- version: 17.9.3

This device is directly connected to C9300L switch port with Trunk - Trunk(with allowed port).

I was accessing Web GUI of controller, but suddenly it lost connection.
From the device itself, all interface is up status, but port is not blinking. it just steady green light. (No logs were found on both switch/WLC)

I need to unplug and plug back to switch port whenever I faced on this issue.

Do you think it's a hardware issue?

Anyone has same issue with me?

Thank you for your comment.

Leo Laohoo · ‎10-06-2023

What did the logs say?

Was the WLC still pingable during that brief moment?

eeebbunee · ‎10-07-2023

No logs on switch and controller. It just disconnected. No ping wlc to switch was possible, and opposite way neither.
It happened several times while I am testing Wi-Fi connection. In order to check logs right away, I kept connecting to wlc by serial, but couldn’t found any issue.
I checked interface, vlan status, but it was all up. I have created TAC because I thought it might not a software issue because even the moment it lost connection, I was able to get cli result such as sh ip int br/ sh int status.

Will share later it I got any response from Cisco team.

marce1000 · ‎10-06-2023

- Also configure a syslog server on the WLC9800-L , and follow up on logs send to it , especially around those times that the controller freezes

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Rich R · ‎10-07-2023

And get a console connection to the WLC for any logs which might appear there.
Update to 17.9.4 which is the currently TAC recommended release - see link below.

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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

eeebbunee · ‎10-07-2023

I upgraded to be 17.9.4 from 17.9.3 but no luck.. still have same issue.
will keep check this with TAC. Thank you, Rich R.

marce1000 · ‎10-07-2023

>....I upgraded to be 17.9.4 from 17.9.3 but no luck
- For the specific 9800-L model also make sure that the ROMMON software and IOS-XE Hardware programmable devices are up to date (go to software downloads to find these links)

Look for 'hidden' crash reports with :
dir bootflash:/core/ | i core|system-report
show version | inc reload

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '