Hello! I know, there are already many posts to this topic, however I'm stuck with my config. I want to use the one NIC for LAN VLAN (ID 1) and WAN VLAN (ID 100).
Therefore I've configured the bridge as VLAN aware:
auto lo
iface lo inet loopback
iface enp3s0 inet manual
auto vmbr0
iface vmbr0...