WMM Performance issue on 1602 and 7.6

[Sebastian Helmer]

Dear all,

after I replaced the 1130 with the 1602i I found a strange issue. Some tests were necessary to find it.

With my intelCard in my notebook the performance was very bad after the replacement. After checking the RF I see it is quiet well I use also autoRF and Channel assignment etc.

NOW, when I disable U-APSD or WMM on the SSID the network works great. I guess it is a power safe problem due the the fact that it works when I disable U-APSD on the client or WMM completly at the WLC. As well as on intel Client with 14. which not support U-APSD.

Tomorrow I will try to test the same on the 2602e and see if it is the same. If found two bugs but they are not direclty related to my problem. Is there anyone  who has the same or have same details for me.

WLC code 7.6.130.0

Intel code 17

CSCuq48800

https://tools.cisco.com/bugsearch/bug/CSCuq48800

CSCum49200

https://tools.cisco.com/bugsearch/bug/CSCum49200

any idea would be nice. Should i go to 8. but I updated just these days ;)..

Br

Sebastian

[Sebastian Helmer]

maybe any relationship with that?
https://tools.cisco.com/bugsearch/bug/CSCui65439

[Leo Laohoo]

Sebastian, 

The common denominator when upgrading 1130 to 1602 is 802.11n.  If you disable 802.11n on the Intel wireless NIC, do you see any improvements? 

Intel's wireless NIC, like the 6205, is well know for it's inability to work well in an 802.11n wireless environment.  

As what Steve has mentioned, it's also worthwhile upgrading the drivers to the cards.

[Sebastian Helmer]

Hi there,

thanks a lot, I was thining it can't be an 802.11n Problem, because when I disable WMM it works...But I did the test and it seems to help..

I use the newest Driver.

Intel(R) Dual Band Wireless-N 7260 (Vers. 17.1.0.19)

I found some additional Information and wenn I disable the HT-Mode which is the "N" mode at intel, it is working very well for me in the moment. Maybe I Need for time to be sure.

So what is the way I Need to go? Change all CLients wo non "n"? The Business will telling me u install new APs, spend Money and we have no improvement...CLient Management will killing me ;)...but on the other hand I will use WMM for MS-Lync QoS.

Is that a Client or an AP/WLC/code issue?

regards,

Sebastian

[Leo Laohoo]

Sebastian, 

They can "kill" you but in the end the culprit lies with Intel.  Find a wireless client other than Intel and see if the performance is similar or far better.  This is your proof that it's an Intel issue.  

My recommendation is don't tell management that you've disabled 802.11n.   As long as it's working, they'll soon forget about it.

[Sebastian Helmer]

Leo,

Thanks, I will also test the same on other APs models. as well as on differen Clients. It is the case but to be honest I can't believe that 802.11n makes so much Trouble...So we will see mayb it is just an AP Thing..I have to lees experience, in that but I work on it now..

thanks so far for your comments, any more are very appreciated..

[Leo Laohoo]

Intel ain't the only one who's been having bad codes with their wireless card.  There are a lot others.  It happens.  

[Sebastian Helmer]

Dear all,

thanks very much..

After a lot of coffee and no more ideas I get the Chance to use the same Laptop of my with the same Driver but just different OS and it works very well.

So I deinstalles my wifi and installed it again. and since that it seems to work..

shame on me, it was just a Client issue I guess...Now it's time to ask my colleauges why they asked me that the wifi is so bad...maybe they just kidding me because we changed something..

I will only feel well when it stays stable, but we will see..

[Stephen Rodriguez]

I would first make sure that you are running the latest drivers for your NIC.

Steve