VLAN
/etc/systemd/network/01-BRIDGE_LAN.netdev
[Bridge] DefaultPVID=1 VLANFiltering=1
/etc/systemd/network/23-BRIDGE_LAN.network
[Network] VLAN=BRIDGE_LAN.50
/etc/systemd/network/07-BRIDGE_LAN.50.netdev
[NetDev] Name=BRIDGE_LAN.50 Kind=vlan [VLAN] Id=50