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**Overview**
IEEE 802.1ad_, commonly known as QinQ, is an Ethernet standard first published
as an amendment to 802.1q_ in 2005, then officially merged into the base
standard in 2011.
Unlike the original 802.1q_, which allows a single VLAN header per Ethernet
frame, QinQ allows two VLAN headers per Ethernet frame, for the inner and the outer VLAN tags.
Most often the inner VLAN tag comes from a customer while the outer tag is used by the service
provider to differentiate between traffic of different customers.
**Frame structure and ethertypes**
The IEEE 802.1ad_ (QinQ) frame includes two VLAN tags:
* **The outer service tag (S-TAG):** The S-TAG is typically added by the provider.
It uses the Ethertype 0x88a8 by default.
* **The inner customer tag (C-TAG):** The C-TAG is generated by the customer's equipment and
remains unchanged during transit. It uses the Ethertype 0x8100.
**Implementation in VyOS**
In VyOS, these tag types are associated with the following CLI options:
* ``vif-s``: Corresponds to the S-TAG (Ethertype 0x88a8).
* ``vif-c``: Corresponds to the C-TAG (Ethertype 0x8100).
.. cmdinclude:: /_include/interface-address-with-dhcp.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-description.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-disable.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-disable-link-detect.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-mac.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-mtu.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-ip.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-ipv6.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-vrf.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
**DHCP(v6)**
.. cmdinclude:: /_include/interface-dhcp-options.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-dhcpv6-options.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. cmdinclude:: /_include/interface-dhcpv6-prefix-delegation.txt
:var0: {{ var0 }}
:var1: {{ var1 }}
:var2: vif-s
:var3: <vlan-id>
:var4: 1000
:var5: vif-c
:var6: <vlan-id>
:var7: 20
.. include:: /_include/common-references.txt
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