Wireless Access

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Contributor I
Posts: 44
Registered: ‎03-10-2014

channel utilization : Interference

Dear all expert ,

I'm having problem that my customer site is using a lot of notebook that support only 802.11n in g channel. However i got some problem that in sometime we will get some ping request timeout even a-channel notebook too. However i notice that AP that have high "channel utilization" will have the problem. So i'm not sure what is the meaniing of interference within "Channel utilzation". Becuase afte i breakdown Channel utilization , i will get "TX time" , "RX time" and "Interference". But i don't understand what does it mean for interference. Does it mean another APs interfere this AP. Or what does it mean?

 

Thanks ,,

Guru Elite
Posts: 20,810
Registered: ‎03-29-2007

Re: channel utilization : Interference

Can we see a screenshot of what you are talking about?



Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 44
Registered: ‎03-10-2014

Re: channel utilization : Interference

Opps , Sorry i forgot to attach it.

 

 

Guru Elite
Posts: 20,810
Registered: ‎03-29-2007

Re: channel utilization : Interference

- Remove channels 5 and 7 from your regulatory domain profile.  Having access points on channels 5 and 7 create much more interference than access points on 1,6,11.

- Consider lowering the power of your access points

- Please see the article here:  http://community.arubanetworks.com/t5/Technology-Blog/Removing-the-Bottleneck-in-Wireless/ba-p/77978



Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 44
Registered: ‎03-10-2014

Re: channel utilization : Interference

Hi Joseph,

I have 2 Controllers and they work together with 2 VRRP instants. Controller-1 take care AP115 for to be primary of VRRP1 and Controller-2 take care AP215 for to be primary of VRRP2. Both Controllers already took out channel 5 and 7 from regulatory domain like attahcment files. However for "Valid 802.11g 40MHz channel pair" , it still have 1,5 and 7,11 too.

 

Thanks ..

 

Guru Elite
Posts: 20,810
Registered: ‎03-29-2007

Re: channel utilization : Interference

Since 40mhz channels are not being used in the 2.4ghz (802.11g) spectrum the Valid 802.11g 40mhz channels do not matter.  What is the ARM min and MAX tx power for those access points?



Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 44
Registered: ‎03-10-2014

Re: channel utilization : Interference

Hi Joseph,

I setup ARM Max tx = 15 and ARM Min tx = 9. And i tuned up RF like some attachment files. Could you please advice me.

 

Thanks ,,

Guru Elite
Posts: 20,810
Registered: ‎03-29-2007

Re: channel utilization : Interference

You only need to be concerned with the G arm profiles.  Just Uncheck "Client Aware" for now, so that the access points can settle.  What is the utilization on the dashboard?  If it is still high, you would need to enable "Drop Broadcast and Multicast" on all of your Virtual APs.

 



Colin Joseph
Aruba Customer Engineering

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

Contributor I
Posts: 44
Registered: ‎03-10-2014

Re: channel utilization : Interference

Hi Joseph,

I've already unchecked client-aware, however i tried to choose Drop broadcast and unknown multicast but it showed me some error when i apply that i must enable   "Broadcast-filter ARP" too. But when i went to "Stateful firewall" at the global menu and try to enable "Broadcast-filter ARP", it can't configured like attachment file.

Thanks.

Guru Elite
Posts: 20,810
Registered: ‎03-29-2007

Re: channel utilization : Interference

Just go ahead and enable it in the virtual ap. The error message is a reminder. Enable it in all of your virtual APS. Do not enable it in the firewall settings.


Colin Joseph
Aruba Customer Engineering

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

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