02-21-2012 05:34 PM - edited 07-03-2021 09:37 PM
After upgrading, ping times from clients has gone from ~10ms to ~2500ms. I have a Cisco 7500 Flex controller, when running controller code version 188.8.131.52 client performance was as expected. When using code 184.108.40.206 performance is terrible. I have tried upgrade to 220.127.116.11 and clean configuration (reset) with 18.104.22.168 with the same results.
I have tested using 3502i APs with the signal metrics (from AP) reported by the clients (all testing close to these figures):
Signal Strength : -48 dBm
Signal to Noise : 49 dB
AP's are in HREAP/Flex mode. The WLANs use HREAP/FlexConnect local switching. I have tested WLAN's with WPA2-PSK and 802.1x/WPA2 with the same results. I have tested several clients\operatign systems , laptops, ipads, iphone. All experience consitent poor ping latency peformance on both 2.4Ghz and 5 Ghz when using controller code 22.214.171.124.
I have switched between 126.96.36.199 and 188.8.131.52 several times and the results are consistent; good performance on 184.108.40.206 and terrible performance on 220.127.116.11. I would like to use 18.104.22.168 for its enhanced FlexConnect features but this is a real show stopper. Any ideas?
02-21-2012 09:43 PM
If your testing results are this solid and you've been able to do clean configs on both versions of code, then what you have here is a reproducible problem that TAC needs to know about.
The sooner it can be addressed as a code problem, the sooner it will get fixed. You may even find that it's been found already and it's being addressed.
If it turns out to be a bug then either way, you can always ask for special file access to an intermediate non-public engineering release as soon as they have one available.
I know "Call TAC" is not the answer you're looking for, but this is one of those times that it makes a lot of sense to do so.
Please keep us posted. This seems like a pretty significant issue.
02-21-2012 09:49 PM
am currently working on this case.. Wirelessdeploy, i guess you opened up a case as well with us and i am working on the exact similar issue.. please revert back to me if you have opened up the case and i am looking for some outputs!!
02-22-2012 02:27 AM
I am making a new installation with 5508 controller and 1142 AP:s. Just upgraded to 22.214.171.124 and about to install AP:s. Is this performance problem expected with my setup also? Or should I just continue with my installation and see the results myself? I'm going to use Flex/H-Reap mode with my AP:s.
02-22-2012 02:55 AM
This kind of issue happens very rare. You should go ahead and install your APs. This may also happen incase of R&S issue when deploying AP's in Distributed mode. But if your R&S is going smooth then deploying APs shouldn't be any issue. Good luck and update us back if required.
03-15-2012 08:20 PM
here is the bug what we are hitting and here is the workaround as well
|high latency with wireless N clients on 7500 WLC running 7.2 code.|
Symptom:AP3500 performance for 802.11n clients decreasing when connected to WLC 7500.
Other WLC platforms are not affected.Conditions:Workaround:Run the following commands to disable AMPDU schedulerconfig 802.11b 11nSupport a-mpdu tx scheduler disable
config 802.11a 11nSupport a-mpdu tx scheduler disable
03-15-2012 09:08 PM
04-29-2012 12:32 AM
Thanks Surendra for sharing this useful information 5+
04-29-2012 12:34 AM
This document is generated from the above discussion :-
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