Draytek VigorAP 906 User Manual page 61

Open Wireless LAN (2.4GHz)>>Band Steering to get the following web page:
Available settings are explained as follows:
Item
Enable Band Steering
After finishing this web page configuration, please click OK to save the settings.
Description
If it is enabled, VigorAP will detect if the wireless client is capable of
dual-band or not within the time limit.
Check Time.... – If the wireless station does not have the capability of
a 5GHz network connection, the system shall wait and check for
several seconds (15 seconds, in default) to make the 2.4GHz network
connection. Specify the time limit for VigorAP to detect the wireless
client.
5GHz Minimum RSSI – The wireless station has the capability of a
5GHz network connection, yet the signal performance might not be
satisfied. Therefore, when the signal strength is below the value set
here while the wireless station connecting to VigorAP 906, VigorAP will
allow the client to connect to the 2.4GHz network.
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