I speaking of VLAN when used with PROXMOX gui, resulting with this ###.conf
first VM node 1
net0: virtio=xx:xx:xx:20:A2:18:CA,bridge=vmbr0
net1: virtio=xx:xx:xx:BC:E2:D7:AA,bridge=vmbr0,tag=1
On second VM, on node 2
net0: virtio=xx:xx:xx:FE:AC:13:B4,bridge=vmbr0
net1...