Frequent 802.11ac / 802.11bgn change

[iampiotr]

Hello,
we use five AP7632,
users sometimes complain that Wi-Fi is not working.
We noticed that clients very often switch from one mode to another:
802.11ac - 5 GHz
802.11bgn - 2.4 GHz
Almost always when this happens, the user connects to the antenna at the same AP7632 point where he was located, which is bad, because after a couple of seconds he switches back to the old antenna on the same access point.
Sometimes it seems that the client is in one mode for several seconds.
It looks like this frequent switching is causing poor Wi-Fi.
Are there settings to change the transition rule between modes so that this happens less often?
Maybe this is due to some other cause that needs to be eliminated?
(sorry for using an online translator)

[Adam_Minowski]

Best would be to have all 5G capable clients to stick to 5GHz. To be sure, use two different SSIDs. One for for 2.4GHz and second for 5GHz. Associate all 5G capable clients to 5G SSID and the rest to 2.4G. It is the easiest way, and will solve the band hopping once and for all. And of course, do not add connection profile for 2.4G SSID, on 5GHz-capable client. 

This approach requires to have decent 5GHz coverage, which you can achieve with proper RF planning.

And beacuse you have AP7632 with 5.9.2.5, I strongly encourage you to upgrade, as others mentioned already

[Christoph_S · Accepted solution]

Hello Piotr,

Before you start troubleshooting the issue it is imperative that you upgrade the APs to 5.9.8.3.

Please also have a look at this article for some recommendations: https://extremeportal.force.com/ExtrArticleDetail?an=000063581

Thank you,

Chris

[iampiotr]

Hello,

firmware version = 5.9.2.5-001R

disabling some modes is a good idea, but we fear that not all devices will be connected if not all modes are available, especially if we disable all 802.11bgn radio communications.
We thought in the opposite direction - turn off 5 GHz, but that's even worse because the building has a microwave oven that replaces 2.4 GHz. Everyone will successfully connect to 802.11bgn, but before the first heating of food in the microwave, which will create radio interference during its operation.

Thanks for answers.

Piotr

[Christoph_S]

Hello,

Please also advise what firmware version the APs are running on. 

Thank you,

Chris

[SamPirok]

Hello, you might want to try disabling some of the lower data rates on the radios, that should help with unintentional roaming. Depending on your client base you could also explore disabling some of the 802.11bgn radios so clients are encouraged to use the 5GHz radio instead.