vance@zs93kvi:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

auto enc120.508
iface enc120.508 inet static
        address 9.12.23.180
        netmask 255.255.255.0
        network 9.12.23.0
        broadcast 9.12.23.255
        gateway 9.12.23.1
        vlan-raw-device enc120

auto enc180.1295
iface en180.1295 inet static
        address 10.20.95.18
        netmask 255.255.255.0
        network 10.20.95.0
        broadcast 10.20.95.255
        vlan-raw-device enc180
        up ip route add 10.0.0.0/8 via 10.20.95.254 || true

auto enc180.1299
iface en180.1299 inet static
        address 10.20.102.18
        netmask 255.255.255.0
        network 10.20.102.0
        broadcast 10.20.102.255
        vlan-raw-device enc180

vance@zs93kvi:~$ cat /run/network/ifstate
lo=lo
enc120.508=enc120.508

vance@zs93kvi:~$ sudo cat /proc/net/vlan/config
VLAN Dev name	 | VLAN ID
Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
enc120.508     | 508  | enc120
enc180.1295    | 1295  | enc180