ArubaOS and Controllers

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MVP
Posts: 287
Registered: ‎11-04-2008

"Sticky Client" Problems

Hello all,

In wlan ssid profile, we can set the transmit rate. The default settings are:


(WC01) #show wlan ssid-profile CLINICS

802.11a Basic Rates 6 12 24
802.11a Transmit Rates 6 9 12 18 24 36 48 54
802.11g Basic Rates 1 2
802.11g Transmit Rates 1 2 5 6 9 11 12 18 24 36 48 54
Station Ageout Time 1000 sec




The Aruba OS5.0 manual mentioned about tweaking the settings for mesh APs, but did not mention for normal APs, I guess the default settings work for most cases.
I have the problem with intermittent “sticky client” at the hospital and clinic environment which are highly roaming users. When roaming, clients did not detach and re-establish the connection to the near, stronger AP. The problem caused clients to connect at low speed, and dropped out. Case opened to the Aruba supports, the suggestion was changing the rates to only transmit at 36 or above. The solution did not help, so supports suggested the drivers, BIOS… which we had done and the problems remain. Another suggestion was change the clients to “aggressive roaming”, (we used Windows zero client) not sure if this one really help, we still hear complaining.

Questions:
1. Are these rate’s settings in ssid profile above optimum for roaming?
2. Had anyone successfully tweaked any profiles to help the highly roaming clients?
3. What are the different between “Basic Rates” and “Transmit Rates”?

Local controller from this problem location: Aruba 2400, Ver 5.0.1.0. APs were 65, and then replaced with 105; we saw no change with HT turned on or off.
Any suggestions, ideas, or solutions are very appreciated.

Regards,

Trinh Nguyen
~Trinh Nguyen~
Boys Town
Guru Elite
Posts: 20,600
Registered: ‎03-29-2007

Re: "Sticky Client" Problems

Removing lower transmit rates is a way to promote better roaming, but not all clients respond well, or even respond to it. Please look at the explanation of rates here: http://kb.arubanetworks.com/cgi-bin/arubanetworks.cfg/php/enduser/std_adp.php?p_faqid=274

As of ArubaOS 5.0.3 and 3.4.3 and above, there is a parameter in the SSID profile called local-probe-req-thresh which will ignore probes from clients that are below a certain threshold

(Aruba3200) (SSID Profile "test") #local-probe-req-thresh ?
requests will get ignored (only used if
local-probe-response is also enabled)


You should try it with an SNR of 20


Colin Joseph
Aruba Customer Engineering

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MVP
Posts: 287
Registered: ‎11-04-2008

Re: "Sticky Client" Problems

Thanks Colin.

TN
~Trinh Nguyen~
Boys Town
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