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77 lines
2.6 KiB
ReStructuredText
77 lines
2.6 KiB
ReStructuredText
.. include:: ../_include/need_improvement.txt
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.. _qinq-interface:
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QinQ (802.1ad)
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--------------
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IEEE 802.1ad was an Ethernet networking standard informally known as QinQ as
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an amendment to IEEE standard :ref:`vlan-interface`. 802.1ad was incorporated
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into the base 802.1q standard in 2011. The technique is also known as provider
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bridging, Stacked VLANs, or simply QinQ or Q-in-Q. "Q-in-Q" can for supported
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devices apply to C-tag stacking on C-tag (Ethernet Type = 0x8100).
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The original 802.1q specification allows a single Virtual Local Area Network
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(VLAN) header to be inserted into an Ethernet frame. QinQ allows multiple
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VLAN tags to be inserted into a single frame, an essential capability for
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implementing Metro Ethernet network topologies. Just as QinQ extends 802.1Q,
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QinQ itself is extended by other Metro Ethernet protocols.
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In a multiple VLAN header context, out of convenience the term "VLAN tag" or
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just "tag" for short is often used in place of "802.1Q VLAN header". QinQ
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allows multiple VLAN tags in an Ethernet frame; together these tags constitute
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a tag stack. When used in the context of an Ethernet frame, a QinQ frame is a
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frame that has 2 VLAN 802.1Q headers (double-tagged).
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In VyOS the terms **vif-s** and **vif-c** stand for the ethertype tags that
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are used:
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The inner tag is the tag which is closest to the payload portion of the frame.
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It is officially called C-TAG (customer tag, with ethertype 0x8100). The outer
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tag is the one closer/closest to the Ethernet header, its name is S-TAG
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(service tag with ethertype 0x88a8).
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Configuration commands:
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.. code-block:: none
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interfaces
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ethernet <eth[0-999]>
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address <ipv4>
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address <ipv6>
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description <txt>
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disable
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ip
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<usual IP options>
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ipv6
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<usual IPv6 options>
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vif-s <[0-4096]>
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address <ipv4>
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address <ipv6>
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description <txt>
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disable
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ip
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<usual IP options>
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ipv6
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<usual IPv6 options>
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vif-c <[0-4096]>
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address <ipv4>
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address <ipv6>
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description <txt>
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disable
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ip
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<usual IP options>
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ipv6
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<usual IPv6 options>
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Example:
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.. code-block:: none
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set interfaces ethernet eth0 vif-s 333
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set interfaces ethernet eth0 vif-s 333 address 192.0.2.10/32
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set interfaces ethernet eth0 vif-s 333 vif-c 777
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set interfaces ethernet eth0 vif-s 333 vif-c 777 address 10.10.10.10/24
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.. _802.1ad: https://en.wikipedia.org/wiki/IEEE_802.1ad |