Wireless Access

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Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Dell laptops over utilizing G radio none connect using A radio

I have 2 vaps one corporate users with Dell latitude laptops and guest users which are smart phones tablets, and other devices. My wireless system has been managed by several different employees so the configuration is not always best practice. What we are seeing is a classroom of laptops all connected to 2.4GHZ and all personal devices on 5.8GHZ. The 2.4GHZ corporate laptops slow down or drop. When I look at the configuration the corp VAP has band steering check box UN Checked but the VAP for guest wireless it is checked set to A radio preferred. Client match is enabled for ARM A and G radios it appears the guest network is working correctly by steering users to the A radio where more channels are available. but the Crop users where band steering is disabled are only connecting to G Radio. Reading the guide best practice says use client match and not band steering and don't use both one or the other. We are on Code level 6.4.3.7 

Guru Elite
Posts: 21,252
Registered: ‎03-29-2007

Re: Dell laptops over utilizing G radio none connect using A radio

Are you sure that those laptops can even see or connect to the 5ghz  band?

 



Colin Joseph
Aruba Customer Engineering

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Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Re: Dell laptops over utilizing G radio none connect using A radio

The AP-225 is right above them in the center of the classroom. In the past we have had isseus with an older driver and since Dell has come out with a newer driver but the problem had nothing to do with this issue. It seems that the guest VAP is working much better by putting most of the devices on the 5.8 radio. I verified the personal devices are the same users which have the laptops. 

Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Re: Dell laptops over utilizing G radio none connect using A radio

I should add that it's possible these dell laptops have that older driver with the problems we did not push out an update to all laptops it was replace as people complained. 

Guru Elite
Posts: 21,252
Registered: ‎03-29-2007

Re: Dell laptops over utilizing G radio none connect using A radio


kell490 wrote:

I have 2 vaps one corporate users with Dell latitude laptops and guest users which are smart phones tablets, and other devices. My wireless system has been managed by several different employees so the configuration is not always best practice. What we are seeing is a classroom of laptops all connected to 2.4GHZ and all personal devices on 5.8GHZ. The 2.4GHZ corporate laptops slow down or drop. When I look at the configuration the corp VAP has band steering check box UN Checked but the VAP for guest wireless it is checked set to A radio preferred. Client match is enabled for ARM A and G radios it appears the guest network is working correctly by steering users to the A radio where more channels are available. but the Crop users where band steering is disabled are only connecting to G Radio. Reading the guide best practice says use client match and not band steering and don't use both one or the other. We are on Code level 6.4.3.7 


The most important thing is the transmit power of the AP on the 2.4ghz and the 5ghz band.  The 2.4ghz band propagates further than the 5ghz band at the same power, so you need to make the maximum transmit power on the 5ghz 3 to 6 db higher than the 2.4ghz so that clients will prefer the 5ghz band.  Forget Client Match and forget Band Steering.  Start with the principles.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Re: Dell laptops over utilizing G radio none connect using A radio

You could be right because the location where we are having the issue is using the default ARM profile with power settings for both A and G radios

Max Tx EIRP 127 dBm
Min Tx EIRP 15 dBm

 

Where my other locations I have min of 9 dBm for G radio and 21 for max A and G radios most of my laptops at other locations are working correctly. 

Guru Elite
Posts: 21,252
Registered: ‎03-29-2007

Re: Dell laptops over utilizing G radio none connect using A radio

The min and max should be no more than 6db in difference. Ideally the range should match the range of output of your clients. Your max should be no more than 18. I would open a TAC case to have your settings reviewed.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Re: Dell laptops over utilizing G radio none connect using A radio

When you mean match the range of output to your clients what you mean is the distance from the AP to the client I'm assuming? 6 DB range is that because client match can only very the signle strenth by 6 DB?

Guru Elite
Posts: 21,252
Registered: ‎03-29-2007

Re: Dell laptops over utilizing G radio none connect using A radio

Your TX power min should be 12 and your TX power max should be at 18 to start on the 5ghz band.  That would roughly match the output power of your clients on the wireless.  In many situations you would have to make the 2.4ghz arm min 9 or 12 and the max 12, to make it lower than the 5ghz and because you have to avoid more cochannel interference on the 2.4ghz band.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Frequent Contributor I
Posts: 91
Registered: ‎02-05-2014

Re: Dell laptops over utilizing G radio none connect using A radio

What about outdoor areas where a few buildng mounted AP's are flooding 300-500 feet away from the antenna would you still only do 12-18 range on 5GHZ?

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