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MVP
Posts: 1,111
Registered: ‎10-11-2011

Occasional Poor Channel Re-use

I'm occasionally seeing poor channel re-use on 5GHz.  Today, I have 3 APs all on the same channel within a relatively close space (50-60ft).  APs can hear eachother around -78 to -83, which is still high enough to trip CCA resulting in interference.  ARM should be a better judge than me by using its coverage/interference index, but I can't help but wonder how I can possibly end up with 3 APs on the same channel?  More importantly, do we have any control over this?  I'd like to believe I can get better channel re-use by adjusting some knobs.  Thoughts?

 

Anyone try static channel plans as an alternative?

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MVP
Posts: 4,308
Registered: ‎07-20-2011

Re: Occasional Poor Channel Re-use

Are you using 40 or 20 channels ?
Thank you

Victor Fabian
Lead Mobility Engineer @ Integration Partners
AMFX | ACMX | ACDX | ACCX | CWAP | CWDP | CWNA
MVP
Posts: 1,111
Registered: ‎10-11-2011

Re: Occasional Poor Channel Re-use

Good question!  20Mhz channels.

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Guru Elite
Posts: 21,541
Registered: ‎03-29-2007

Re: Occasional Poor Channel Re-use


thecompnerd wrote:

I'm occasionally seeing poor channel re-use on 5GHz.  Today, I have 3 APs all on the same channel within a relatively close space (50-60ft).  APs can hear eachother around -78 to -83, which is still high enough to trip CCA resulting in interference.  ARM should be a better judge than me by using its coverage/interference index, but I can't help but wonder how I can possibly end up with 3 APs on the same channel?  More importantly, do we have any control over this?  I'd like to believe I can get better channel re-use by adjusting some knobs.  Thoughts?

 

Anyone try static channel plans as an alternative?


You can start by looking to see what one of the access points sees to determine how well it sees all of those APs.  The "show ap arm state ap-name <name of ap>" will show you how it sees all other access points and how strong.  The "show ap arm rf-summary ap-name <name of ap>" command will show you what it thinks about the activity and quality on other channels.  Add up the interference indexes and see what the access point considers is the best channel for yourself.  An access point has to see a channel that is X amount better than the one he is on to actually change channels.  It does not automatically change because it shares the same channel with another access point.

 



Colin Joseph
Aruba Customer Engineering

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