10-27-2022 12:40 AM
Hello!
Yesterday we updated our Cisco 8540 WLC to 8.10.181.0,
Now we are experiencing trouble with all our Cisco 2802 AP's. The problem we are seeing is very slow down speeds on personal devices connected to the accesspoints while the up speed seems fine when testing. Some sites also seems to work flawless while others don't.
We also have 2700, 1800, 9120 and 9105 AP's on the same WLC which all seems to works fine.
Anyone have any ideas?
Solved! Go to Solution.
10-27-2022 12:46 AM
- FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw52888
M.
10-27-2022 03:58 AM - edited 10-27-2022 02:58 PM
The fix may be to change the TCP MSS to 1250 but it is not CSCvw52888.
This is, in fact, CSCwd37092.
I know of this because I have a TAC Case with this exact behaviour.
10-27-2022 12:46 AM
- FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvw52888
M.
10-27-2022 03:03 AM
The solution described in this did the trick, thank you very much @marce1000!
10-27-2022 02:58 AM
Is this impacting one particular client or similar client group? If yes, did you try upgrading the drivers?
How did you measure the performance to conclude that downloads are slow?
How was the RF environment of these APs which was causing this issue?
Was the client connected to slot 0 or slot 1 of the AP? (2.4 or 5Ghz)
Do you have FRA enabled? Did you check the radio status of the APs?
10-27-2022 03:58 AM - edited 10-27-2022 02:58 PM
The fix may be to change the TCP MSS to 1250 but it is not CSCvw52888.
This is, in fact, CSCwd37092.
I know of this because I have a TAC Case with this exact behaviour.
10-27-2022 05:11 AM
Yep @Leo Laohoo is correct of course.
I added the info into my signature as a warning so you'll see it on any of my posts.
At my request TAC have also added a warning to https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html#anc4 now - not sure why they didn't do that as soon as it was confirmed.
10-31-2022 06:45 PM - edited 10-31-2022 06:47 PM
A re-build version of 8.10.181.0, to fix the slow speed for the affected APs (2800/3800/4800/1562/6300), will be released in the next 48 hours.
This re-build will NOT fix the issue with failed EAP authentication due to oversized certificates.
10-31-2022 11:50 PM
- I suppose it will get a new suffix version-ending number to denote the fix ?
M.
11-01-2022 01:53 AM - edited 11-01-2022 01:55 AM
I think the re-build will be 8.10.181.3.
10-31-2022 10:57 PM
So not really a fix then?
11-01-2022 01:57 AM
Yes and no.
Fixes the slow WiFi speed but will not fix the issue with failed EAP authentication due to oversized certificates.
But I could be wrong.
11-02-2022 05:33 PM - edited 11-03-2022 02:50 PM
Re-build version 8.10.181.3 is now out. Special download link provided by TAC.
12-04-2022 04:02 PM
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