VLAN Subinterface (802.1q)

This example configures a VLAN subinterface (IEEE 802.1q):

rename the base interface to trunk
set the base interface link to up
create a VLAN subinterface for VLAN ID 42
make device state not to track the base interface's device state
set the subinterface link state to up
add an ipv4 address on the subinterface

ifstate.yamlNixOSCLI

interfaces:
  trunk:
    link:
      kind: physical
      state: up
    identify:
      perm_address: 8c:16:45:dc:b1:ad
  outside:
    addresses:
      - 192.0.2.1/24
    link:
      kind: vlan
      link: trunk
      vlan_id: 42
      vlan_flags:
        loose_binding: true
      state: up

{
  networking.ifstate = {
    enable = true;
    settings = {
      interfaces = {
        trunk = {
          link = {
            kind = "physical";
            state = "up";
          };
          identify.perm_address = "8c:16:45:dc:b1:ad";
        };
        outside = {
          addresses = [ "192.0.2.1/24" ];
          link = {
            kind = "vlan";
            link = "trunk";
            vlan_id = 42;
            vlan_flags = {
              loose_binding = true;
            }
            state = "up";
          };
        };
      };
    };
  };
}

ip link dev eth0 set down
ip link set dev eth0 name trunk up
ip link add name outside link trunk type vlan id 42 loose_binding on
ip link set dev outside up
ip address add 192.0.2.1/24 dev outside