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New Member

2APs with same channel number ans SSID

eg I have 2 APs on channel 6 with SSID = cisco

what will happen when 2 APs CROSS each other?

what happen to client in CROSS region?

what happen when client roam across?

7 REPLIES
New Member

Re: 2APs with same channel number ans SSID

You are trying to increase your range, not throughput. No problem.

New Member

Re: 2APs with same channel number ans SSID

I am looking at what happen to the client when it is in the "CROSS" region. will the adapter get confused on APs selection? which AP will client decide to talk to then? Thanks

New Member

Re: 2APs with same channel number ans SSID

you should indeed have overlap between access points to allow for roaming. it would be best if they were on different non-overlapping channels such as channels 1, 6, or 11. what happens in the overlapping region is that the client will keep monitoring the signal strength and bit error rates of the AP it is associated to. if the signal levels drop too low or the bit error rate is too high, then it will begin scanning for another access point that has better readings. if it finds one (and it will), it will disassociate to the previous AP and associate to the new one.

New Member

Re: 2APs with same channel number ans SSID

You state that:

if the signal levels drop too low or the bit error

rate is too high, then it will begin scanning for

another access point that has better readings

How can you configure this? We have found that the client doesn't roam until his association is completly in the ditch. How can I get it to roam at a level that is something less than total session failure?

Thanks,

Brent

New Member

Re: 2APs with same channel number ans SSID

I have the same problem Brent. I can walk across the building and stand under a differenct Access Point, and my signal and quality will be very low, but it won't release the first and switch to the second, until it's SEVERLY degraded. I would like it to opportunistically switch at around 30% Signal if it makes sense. Is there a way to tune this?

Thanks

Ray

New Member

Re: 2APs with same channel number ans SSID

Do you change of subnet ?

we had experience that kind of problem and we will try the IOS with mobile ip. It can slove the inter subneting problem.

I dont install that already but i think it can be a way to slove you problem, we will try it.

New Member

Re: 2APs with same channel number ans SSID

If you've got the same channel overlapping, you'll get interference (lower signal quality). The results might vary, but the best solution is to make sure that APs on each channel don't overlap with an AP on the same channel. A good site survey will help prevent this.

In regards to the roaming delay problems: I've read that the roaming will improve with later firmware revisions.

Someone has mentioned changing the "Max RTS Retries" setting - I've found the easiest way to make an individual client roam (if you're standing under another AP, etc) is to stick your hand over the PC card antenna. It's dodgy, but it works :)

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