QinQ — allows multiple VLAN tags to be inserted into a single frame.
QinQ can be used to tunnel vlans in a vlan.
vif-s and vif-c stand for the ethertype tags that get set:
The inner tag is the tag which is closest to the payload portion of the frame; it is officially called C-TAG (Customer tag, with ethertype 0x8100).
The outer tag is the one closer/closest to the Ethernet header; its name is S-TAG (Service tag, ethertype 0x88a8).
Example:
vyos@vyos-rtr:~$ configure
vyos@vyos-rtr#set interfaces ethernet eth0 vif-s 333
vyos@vyos-rtr#set interfaces ethernet eth0 vif-s 333 address 192.0.2.10/32
vyos@vyos-rtr#set interfaces ethernet eth0 vif-s 333 vif-c 777
vyos@vyos-rtr#set interfaces ethernet eth0 vif-s 333 vif-c 777 address 10.10.10.10/24
Configuration commands:
interfaces
ethernet <eth[0-999]>
address <ipv4>
address <ipv6>
description <txt>
disable
ip
<usual IP options>
ipv6
<usual IPv6 options>
vif-s <[0-4096]>
address <ipv4>
address <ipv6>
description <txt>
disable
ip
<usual IP options>
ipv6
<usual IPv6 options>
vif-c <[0-4096]>
address <ipv4>
address <ipv6>
description <txt>
disable
ip
<usual IP options>
ipv6
<usual IPv6 options>