.. _interfaces-qinq: QinQ ---- QinQ (802.1ad_) — 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). Configuration commands: .. code-block:: sh 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> Example: .. code-block:: sh set interfaces ethernet eth0 vif-s 333 set interfaces ethernet eth0 vif-s 333 address 192.0.2.10/32 set interfaces ethernet eth0 vif-s 333 vif-c 777 set interfaces ethernet eth0 vif-s 333 vif-c 777 address 10.10.10.10/24 .. _802.1ad: https://en.wikipedia.org/wiki/IEEE_802.1ad