Draytek VigorAP 902 User Manual page 146

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.
Below shows how Band Steering works.
VigorAP 902 User's Guide
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 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 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 902, VigorAP will
allow the client to connect to 2.4GHz network.
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