05-27-2020 04:30 AM - edited 07-05-2021 12:06 PM
I am using Mobility Express 8.10.112 with Dynamic Channel Assignment but it is not working as expected and I am experiencieng some problems and disconnections from clients.
Three AP's located one above the other on different floors are using the same 2.4 GHz channel. And clients sometimes are connecting to AP's on differents floors.
Previously I was using a WLC 5508 with those AP's and they selected 3 different channels
what can I do?
Thanks
05-27-2020 05:51 AM
first you need to verify if on AP is functioning as master-AP (as controller) for the others? or are they working stand-alone?
second DCA does not allways mean different channels are selected. If there is little interference then same channel is a valid option.
third the WLC could have been tuned so DCA occurs on different parameters than the ME-controller does.
05-27-2020 07:39 AM
05-27-2020 11:36 AM
I have more AP's in each floor, but what it's strange for me is that those AP's that are one below the other vertically on adjacent floors are on the same channel. And there are clients who detect both AP's (in adjacent floors) as the better signal and it seems this is creating some issues with the client performance.
This just happens since I migrated from WLC to Mobility Express. Before that all those AP's were in different channels
As I understand ideally the 3 AP's detected as best signal by a client should be in 3 non overlapping channels and that is not happening in some zones
05-27-2020 01:15 PM
05-28-2020 02:08 AM
Yes, I don't have enough 5 Ghz coverage so I turned it off.
I have noticed that at night the channel selection is more as expected, while during the day it changes. In this case it seems I have a bad channel selection because of my neighbours, do you agree?
So maybe is better to fix the channels in some AP's
05-28-2020 03:59 AM - edited 05-28-2020 04:06 AM
05-28-2020 04:06 AM
I agree completely with that. I have most of my AP's in hallways and I need to have more in rooms.
Meanwhile, the problem enabling 5 GHz now is that there are devices that prefer a very bad 5 GHz connection than a good 2.4 GHz, so their experience is bad.
05-28-2020 04:14 AM
05-28-2020 05:13 AM
In my testing, Apple devices prefer connecting to a poor 5 GHz wifi than connecting to 2.4 GHz. And that creates a bad user experience if you don't have a good 5 GHz coverage.
For me, it would be great if clients are able of choosing the best connection, but what I see it's that not always happens
Maybe I need to tune the configuration. Any help to configure 5 GHz with bad coverage? enable or disable lower rates? What about client load balancing? Maybe if I don't have a lot of clients it's better to disable load balancing because if not clients can roam to AP's with worse coverage. Band selection? Optimized roaming?
05-28-2020 08:27 AM
05-28-2020 09:44 AM
Thank you very much.
What lower date rates do you recommend to disable?
You say "Remember on 5ghz you want to have the channel width at 40mhz", why? can be greater or automatic?
05-28-2020 10:26 AM
05-29-2020 08:55 AM
when I try to fix channel width to 40 MHz in Advanced - RF Optimization, I receive the message "At least One channel number should be selected" and "Error in IPAdress". And the channel Width remains in "Best"
05-29-2020 09:30 AM
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