The client devices that connect to your network include a mix of dual-band 802.

When the client sends a probe request in the 2.4 GHz band, the AP may reply with information about the 5 GHz BSS.

The AP may ignore the initial probe requests or 802.11 authentication requests sent in the 2.4 GHz band by dual-band clients

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then send unicast channel switch announcements to the client announcing the 5 GHz channel as the new channel.

After receiving probe request frames from the same client in both bands, the AP may send an association request frame to the client in the 5 GHz band.

The AP may allow an 802.11 association with the client in the 2.4 GHz band, then the AP may perform a transparent client handoff by transferring the client’s MAC address to the 5 GHz radio.