From 06dcd45ff81e06bc8cf40ed487c0b2652d346a5a Mon Sep 17 00:00:00 2001
From: John DeNisco <jdenisco@cisco.com>
Date: Thu, 26 Jul 2018 12:45:10 -0400
Subject: Initial commit of Sphinx docs

Change-Id: I9fca8fb98502dffc2555f9de7f507b6f006e0e77
Signed-off-by: John DeNisco <jdenisco@cisco.com>
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+.. _subinterfacecommands:
+
+.. toctree::
+
+Create Sub-Interfaces
+=====================
+This command is used to add VLAN IDs to interfaces, also known as
+subinterfaces. The primary input to this command is the '*interface*'
+and '*subId*' (subinterface Id) parameters. If no additional VLAN ID is
+provide, the VLAN ID is assumed to be the '*subId*'. The VLAN ID and
+'*subId*' can be different, but this is not recommended.
+
+This command has several variations:
+
+-  **create sub-interfaces <interface> <subId>** - Create a subinterface
+   to process packets with a given 802.1q VLAN ID (same value as the
+   '*subId*').
+-  **create sub-interfaces <interface> <subId> default** - Adding the
+   '*default*' parameter indicates that packets with VLAN IDs that do
+   not match any other subinterfaces should be sent to this
+   subinterface.
+-  **create sub-interfaces <interface> <subId> untagged** - Adding the
+   '*untagged*' parameter indicates that packets no VLAN IDs should be
+   sent to this subinterface.
+-  **create sub-interfaces <interface> <subId>-<subId>** - Create a
+   range of subinterfaces to handle a range of VLAN IDs.
+-  **create sub-interfaces <interface> <subId> dot1q|dot1ad <vlanId>|any
+   [exact-match]** - Use this command to specify the outer VLAN ID, to
+   either be explicited or to make the VLAN ID different from the
+   '*subId*'.
+-  **create sub-interfaces <interface> <subId> dot1q|dot1ad <vlanId>|any
+   inner-dot1q <vlanId>|any [exact-match]** - Use this command to
+   specify the outer VLAN ID and the innner VLAN ID.
+
+When '*dot1q*' or '*dot1ad*' is explictly entered, subinterfaces can be
+configured as either exact-match or non-exact match. Non-exact match is
+the CLI default. If '*exact-match*' is specified, packets must have the
+same number of VLAN tags as the configuration. For non-exact-match,
+packets must at least that number of tags. L3 (routed) interfaces must
+be configured as exact-match. L2 interfaces are typically configured as
+non-exact-match. If '*dot1q*' or '*dot1ad*' is NOT entered, then the
+default behavior is exact-match.
+
+Use the '*show interface*' command to display all subinterfaces.
+
+Summary/Usage
+-------------
+
+.. code-block:: shell
+
+    create sub-interfaces <interface> {<subId> [default|untagged]} | {<subId>-<subId>} | {<subId> dot1q|dot1ad <vlanId>|any [inner-dot1q <vlanId>|any] [exact-match]}.
+
+Examples
+--------
+
+Example of how to create a VLAN subinterface 11 to process packets on 802.1q VLAN ID 11:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 11
+
+The previous example is shorthand and is equivalent to:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 11 exact-match
+
+Example of how to create a subinterface number that is different from the VLAN ID:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 100
+
+Examples of how to create q-in-q and q-in-any subinterfaces:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1q 100 inner-dot1q 200
+    vpp# create sub-interfaces GigabitEthernet2/0/0 12 dot1q 100 inner-dot1q any
+
+Examples of how to create dot1ad interfaces:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 11 dot1ad 11
+    vpp# create sub-interfaces GigabitEthernet2/0/0 12 dot1ad 100 inner-dot1q 200
+
+Examples of '*exact-match*' versus non-exact match. A packet with outer VLAN 100 and inner VLAN 200 would match this interface, because the default is non-exact match:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 5 dot1q 100
+
+However, the same packet would NOT match this interface because '*exact-match*' is specified and only one VLAN is configured, but packet contains two VLANs:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 5 dot1q 100 exact-match
+
+Example of how to created a subinterface to process untagged packets:
+
+.. code-block:: console
+
+   vpp# create sub-interfaces GigabitEthernet2/0/0 5 untagged
+
+Example of how to created a subinterface to process any packet with a VLAN ID that does not match any other subinterface:
+
+.. code-block:: console
+
+    vpp# create sub-interfaces GigabitEthernet2/0/0 7 default
+
+When subinterfaces are created, they are in the down state. Example of how to enable a newly created subinterface:
+
+.. code-block:: console
+
+    vpp# set interface GigabitEthernet2/0/0.7 up
+        
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