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Occasional Contributor II
Posts: 12
Registered: ‎02-06-2008

State of DFS client support

What is the current state of client DFS support? 

 

Is DFS ready for global use in a HD campus environment or should it still be limited to locations that are also covered by non-DFS channels?

 

Also, did the AP-105 ever get DFS support?  For a long time I know it wasn't supported (despite the DS saying it was).  Also are there other APs that don't support DFS?

 

Best

 

 

Guru Elite
Posts: 21,023
Registered: ‎03-29-2007

Re: State of DFS client support

Assuming that your country is the US, the AP105 does have DFS support (AOS 6.3.1.7)

 

 




(192.168.1.3) #show ap allowed-channels country-code US ap-type ap-105 Allowed Channels for AP Type ap-105 Country Code "US" Country "United States" ----------------------------------------------------------------------------- PHY Type Allowed Channels -------- ---------------- 802.11g (indoor) 1 2 3 4 5 6 7 8 9 10 11 802.11a (indoor) 36 40 44 48 52 56 60 64 100 104 108 112 116 132 136 140 149 153 157 161 165 802.11g (outdoor) 1 2 3 4 5 6 7 8 9 10 11 802.11a (outdoor) 52 56 60 64 100 104 108 112 116 132 136 140 149 153 157 161 165 802.11g 40MHz (indoor) 1-5 2-6 3-7 4-8 5-9 6-10 7-11 802.11a 40MHz (indoor) 36-40 44-48 52-56 60-64 100-104 108-112 132-136 149-153 157-161 802.11g 40MHz (outdoor) 1-5 2-6 3-7 4-8 5-9 6-10 7-11 802.11a 40MHz (outdoor) 52-56 60-64 100-104 108-112 132-136 149-153 157-161 802.11a (DFS) 52 56 60 64 100 104 108 112 116 132 136 140

 

With regards to client support, there are quite a few like Motorola phones for example that do not support DFS.  For every client that does not support DFS you would be creating a "coverage hole" or making the 2.4ghz side of the access point more attractive which would sort of defeat the purpose of having 5ghz rates in the first place.  If you have a high density environment and only run 20mhz channels with no DFS, you would still have 9 channels to deal with, which in many environments is very  good.  Organizations that have full control over the majorityof their clients that they desire to do DFS have a better chance of success in a setup with DFS.

 



Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 12
Registered: ‎02-06-2008

Re: State of DFS client support

Thanks Colin.  I'm in US EDU so I have zero client control.

 

Practically everything is HD here so the extra DFS channels would help considerably.  I don't however want to make wifi unusable for any of my users.  If the percentage of my clients that didn't support DFS was low enough it could make since to push them to 2.4 so everyone else benefited, but it would have to be a very low % (<5%). 

 

It sounds like we should limit our DFS usage to select areas for now.

 

Thanks again

 

 

 

Guru Elite
Posts: 21,023
Registered: ‎03-29-2007

Re: State of DFS client support

Rdholden,

Please let us know how it goes. Everyone's environment is different so let us know what works in yours so others can benefit.


Colin Joseph
Aruba Customer Engineering

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

Aruba
Posts: 1,368
Registered: ‎12-12-2011

Re: State of DFS client support

If it's a very dense deployment...other than DFS, have you considered 20 MHz channels?  

Seth R. Fiermonti
Consulting Systems Engineer - ACCX, ACDX, ACMX
Email: seth@hpe.com
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Occasional Contributor II
Posts: 12
Registered: ‎02-06-2008

Re: State of DFS client support

Yes it is very dense and we came to the same conclusion.  We're exclusively using 20MHz channels.  In most places we get by okay with the non-DFS channels, but we also have quite a few locations that could use more.

 

Dense, multi-story buildings can be a real challenge.  By the way, can we all just vote to turn 2.4 off - forever.

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