Answer

You must load Summit firmware for multi-BSSID support. After loading the driver and firmware, perform the following: Stop all software that may be managing the Wi-Fi interface including the supplicant, NetworkManager, connman, hostapd, etc.

List out the current virtual interfaces on the physical interface (phy):

  # iw dev phy#0         Interface wlan0                 ifindex 7                 wdev 0x1                 addr c0:ee:40:50:00:00                 type managed                 txpower 20.00 dBm 

 

Delete the virtual interface:

  # iw wlan0 del 

 

Add up to 3 virtual interfaces onto the phy using unique names per dev (note there are two underscores in __ap):

  # iw phy0 interface add ap0 type __ap # iw phy0 interface add ap1 type __ap # iw phy0 interface add ap2 type __ap 

 

Confirm the virtual interfaces exist:

  # iw dev phy#0         Interface ap2                 ifindex 10                 wdev 0x4                 addr c0:ee:40:50:00:02                 type AP                 txpower 20.00 dBm         Interface ap1                 ifindex 9                 wdev 0x3                 addr c0:ee:40:50:00:01                 type AP                 txpower 20.00 dBm         Interface ap0                 ifindex 8                 wdev 0x2                 addr c0:ee:40:50:00:00                 type AP                 txpower 20.00 dBm 

The MAC on the first interface will not change and each subsequent interface added will add 1 to the first MAC.