Clients only connecting 11a/11g
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04-12-2024 07:29 AM
We currently have two 9800 WLCs serving our schools. Their configs are virtually identical. When clients connect to one specific SSID on 9800 A, they'll connect at expected speeds using 11ac or 11n protocols. However, when clients connect to the same SSID on 9800 B, they only connect using 11a or 11g protocols. RF settings appear to be the same across both controllers. Any ideas?
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Catalyst Wireless Controllers
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04-12-2024 09:00 AM - edited 04-12-2024 09:07 AM
- Have a checkup of the 9800 B controller's configuration with the CLI command show tech wireless
and feed the output from that into : Wireless Config Analyzer
Adding : do the same on 9800 A and look for differences.
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! '
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04-12-2024 09:44 AM
Will do! Thanks for the suggestion.
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04-12-2024 09:33 AM
Can you share RF config
MHM
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04-12-2024 09:43 AM
We're still new to the 9800s, so I'm not entirely sure how to tell which RF profile is being used for that specific SSID.
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04-13-2024 12:26 AM
Configuration > wireless > access points
This will list all AP's
Beside AP name there is blue icon click it
You will see the rf tag of AP
Compare this for two wlc and check different
MHM
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04-15-2024 06:40 AM
Ahh right. 2.4 and 5 are both using global configs, and the actually RF tag for the site says global config as well.
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04-12-2024 04:40 PM - edited 04-12-2024 04:41 PM
What model of APs in 9800A and 9800B?
What firmware are 9800A and 9800B on?
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04-15-2024 06:41 AM
3802is for the most part, with a few exceptions.
IOS version 17.9.4.27
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04-15-2024 06:12 PM
@akcampbell wrote:
3802is for the most part, with a few exceptions.
IOS version 17.9.4.27
A perfect combination (not good).
Reboot all the 3800 and see if this problem goes away.
If the problem goes away after the reboot, consider moving away from 17.9.4/17.9.4a or 17.9.5. We are seeing a significant amount of really "bizarre" bugs.
And as a "bonus" for using 3800 (which is another bucket of bugs due to a hardware design bug in itself), regular (or daily) reboot of the 3800 (regardless of firmware version of the WLC used) will also make significant improvements.
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04-16-2024 03:11 AM
> We are seeing a significant amount of really "bizarre" bugs.
We've seen one a few times now on AireOS 8.10.190.0 when after a site has switched between WLCs (N+1) and then back to primary WLC all the APs start silently dropping *lots* of incoming packets (sometimes up to 50% even at fairly low traffic levels) so CAPWAP starts flapping. AP reboot fixes it. TAC (after months of captures, debugging and log collecting) still have no explanation. They were only able to establish that the packets are being dropped at a very low level in the AP (possibly at ethernet driver) but do not know why... Due to another known bug (which will not be fixed) the captures and debugs were not able to confirm why the packets get dropped. Since AireOS is EOL they are not doing any more about it. We now know that when this happens we need to reboot every AP on site!
We're relatively stable on 17.9.4 + SMU's and APSP6 at the moment with C91xx, 1832 and 1562 APs and starting to look at 17.9.5 but waiting for TAC to explain a WLC crash on 17.9.5 seen in lab.
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
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04-16-2024 03:59 AM
@Rich R wrote:
waiting for TAC to explain a WLC crash on 17.9.5 seen in lab.
Same boat.
We have a 9800-L that crash and went into a state we called "dark mode": The console port was unresponsive, the distribution ports were dark. Because it was not responding to anything, we had to cold-reboot the WLC.
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04-16-2024 05:06 AM
Ours (9800-80) just did SSO switchover so there is a system report file for them to decode - but suspiciously taking longer than it should ...
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
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04-14-2024 03:28 AM
- Have you done a line by line comparison of the configs on the 2 WLCs?
- Are you running TAC recommended IOS/SMU/APSP as per the link below?
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
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04-15-2024 06:43 AM
I've not gone through each line between the two, just compared settings between the two in the GUIs.
As far as I know we're all good on the IOS side and respective patches and service packs.
