After upgrading, ping times from clients has gone from ~10ms to ~2500ms. I have a Cisco 7500 Flex controller, when running controller code version 184.108.40.206 client performance was as expected. When using code 220.127.116.11 performance is terrible. I have tried upgrade to 18.104.22.168 and clean configuration (reset) with 22.214.171.124 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 126.96.36.199.
I have switched between 188.8.131.52 and 184.108.40.206 several times and the results are consistent; good performance on 220.127.116.11 and terrible performance on 18.104.22.168. I would like to use 22.214.171.124 for its enhanced FlexConnect features but this is a real show stopper. Any ideas?
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.
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!!
I am making a new installation with 5508 controller and 1142 AP:s. Just upgraded to 126.96.36.199 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.
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.
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
Thanks Surendra for sharing this useful information 5+
This document is generated from the above discussion :-