Proxmox Management Networking

Say you've setup proxmox and would like the hypervisor to have an interface on a management vlan separate to the vlan where your vms reside. After trunking both vlans to the port the hypervisor plugs into, these are the ifupdown2 settings I used to achieve this (/etc/network/interfaces):

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

# Enable physical ethernet interface and set to manual config mode
auto enp7s0
iface enp7s0 inet manual

# Enable virtual bridge vmbr33 and set static IP on management vlan
auto vmbr33
iface vmbr33 inet static
    address 192.168.33.128/24
    gateway 192.168.33.1
    # Bind physical interface vlan 33 to the bridge
    bridge-ports enp7s0.33
    bridge-stp off
    # Set bridge forwarding delay to 0
    bridge-fd 0
    dns-domain kuso.tech
    dns-nameservers 192.168.33.1

# Enable virtual bridge vmbr66 without assigning ip address
auto vmbr66
iface vmbr66 inet manual
    # Bind physical interface vlan 66 to the bridge
    bridge-ports enp7s0.66
    dns-domain kuso.tech
    dns-nameservers 192.168.66.1

This allows management tasks to be carried out on an isolated management vlan while the hypervisor's vms can be attached to the DMZ vlan.

Screenshot of proxmox user interface showing bridge configuration vmbr66 interface now available in proxmox ui for assignment to vms