Which radio the endpoint will use is a decision in the client driver and is based on a complex algorithm nobody have the answer to, this is different for any vendor. This is also known as "the green diamond", more information at
https://wlanprofessionals.com/decoding-the-green-diamond-understanding-client-behavior/One of the many decision makers its the signal RSSI measurement, but there are many many more attributes for the decision. For example Apple make decision as last known good experience.
There are some small things you can do.
1. To make the 2.4GHz and 5GHz radio equal in cell size and power, plan the 2,4GHz radio -6dBm tx-power as the 5GHz radio to create equal cell sizes.
2. Enable band-steering with prefer 5GHz. But! Band steering is not a IEEE standardization and work different between different vendors, sometimes it helps you, sometimes things get worse.
3. Disable 2.4GHz, or create to separate SSID's one for each radio.
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Marcel Koedijk | MVP Guru 2021 | ACEP | ACMP | ACCP | ACDP | Ekahau ECSE | Not an HPE Employee | Opionions are my own
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Original Message:
Sent: Sep 12, 2021 12:09 PM
From: Mike Robertson
Subject: Radio Power Settings
VHD Campus Deployment - walled (classroom) environment
Mix of AP's 205/225/515/535 - 75% are 515/535 , just waiting on replacement AP's to ship.
Seeing some clients hang on 2.4 ghz longer than they should.
What should my radio power settings be ? Currently they are :
2.4
Min - 6
Max - 12
5
Min - 15
Max - 21
Thx
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Mike Robertson
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