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.
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?
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?
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 :)
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...