Merge pull request #1 from vyos/master

Update fork

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+.. include:: /_include/need_improvement.txt
+
+IEEE 802.1ad_ was an Ethernet networking standard informally known as QinQ as
+an amendment to IEEE standard 802.1q VLAN interfaces as described above.
+802.1ad was incorporated into the base 802.1q_ standard in 2011. The technique
+is also known as provider bridging, Stacked VLANs, or simply QinQ or Q-in-Q.
+"Q-in-Q" can for supported devices apply to C-tag stacking on C-tag (Ethernet
+Type = 0x8100).
+
+The original 802.1q_ specification allows a single Virtual Local Area Network
+(VLAN) header to be inserted into an Ethernet frame. QinQ allows multiple
+VLAN tags to be inserted into a single frame, an essential capability for
+implementing Metro Ethernet network topologies. Just as QinQ extends 802.1Q,
+QinQ itself is extended by other Metro Ethernet protocols.
+
+In a multiple VLAN header context, out of convenience the term "VLAN tag" or
+just "tag" for short is often used in place of "802.1q_ VLAN header". QinQ
+allows multiple VLAN tags in an Ethernet frame; together these tags constitute
+a tag stack. When used in the context of an Ethernet frame, a QinQ frame is a
+frame that has 2 VLAN 802.1q_ headers (double-tagged).
+
+In VyOS the terms ``vif-s`` and ``vif-c`` stand for the ethertype tags that
+are used.
+
+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 with Ethernet Type = 0x88a8).
+
+
+.. 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