VLAN sub-interfaces (802.1Q)

Created by Yuriy Andamasov, Modified on Wed, 17 Jan at 4:37 PM by Srividya Anantapatnaikuni

Article review date	2024-01-17
Validated for VyOS versions	1.2.5, 1.3.5, 1.4.0, 1.5.x

802.1Q VLAN interfaces are represented as virtual sub-interfaces in VyOS. The term used for this is vif. Configuration of a tagged sub-interface is accomplished using the configuration command set interfaces ethernet vif .

vyos@vyos-rtr# set interfaces ethernet eth1 vif 100 description 'VLAN 100'
vyos@vyos-rtr# set interfaces ethernet eth1 vif 100 address '192.168.100.1/24'

Resulting:

ethernet eth1 {
       address 192.168.0.1/24
       description INSIDE
       duplex auto
       hw-id 00:0c:29:44:3b:19
       smp_affinity auto
       speed auto
       vif 100 {
           address 192.168.100.1/24
           description "VLAN 100"
       }
   }

VLAN interfaces are shown as ., e.g. eth1.100:

vyos@vyos-rtr:~$ show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface         IP Address                           S/L      Description
-----------       -------------                        ---      -----------
eth0              172.16.51.129/24                     u/u      OUTSIDE
eth1              192.168.0.1/24                       u/u      INSIDE
eth1.100          192.168.100.1/24                     u/u      VLAN 100
lo                127.0.0.1/8                          u/u  
                  ::1/128
vyos@vyos-rtr:~$