If like me you need to setup your rb750up as a switch, i have managed to bridge ports 1,2,3,4 so you can use port 1 as a poe power source and then use ports 2,3,4 to power your ubiquiti devices. Port 5 is only used for access to the router board with winbox etc. I have left the default dhcp on port 5 so you can access via 192.168.88.1 but port 5 is not bridged.
download the config Routerboard RB750UP switch config
just use winbox to connect to routerboard then drag the backup file to files in winbox, highlight and restore.
