Add networking guide for Neutron extensions

With Kolla supporting Neutron extensions, it is
essential to have networking guide to describe the
installation and configuration of these extensions.

Partial-Bug: #1603391

Change-Id: I78ff5b17e4024d96f8083c96ac5b5b608a7c0015

doc/index.rst

@@ -59,6 +59,7 @@ Kolla Services
    swift-guide
    kibana-guide
    bifrost
+   networking-guide
    kuryr-guide
 
 Developer Docs

doc/networking-guide.rst

@@ -0,0 +1,89 @@
+.. _networking-guide:
+
+============================
+Enabling Neutron Extensions
+============================
+
+Overview
+========
+Kolla deploys Neutron by default as OpenStack networking component. This guide
+describes configuring and running Neutron extensions like LBaaS,
+Networking-SFC, QoS, etc.
+
+Networking-SFC
+==============
+
+Preparation and deployment
+--------------------------
+
+Modify the configuration file ``/etc/kolla/globals.yml`` and change
+the following:
+
+::
+
+    neutron_plugin_agent: "sfc"
+
+Networking-SFC is an additional Neutron plugin. For SFC to work, this plugin
+has to be installed in ``neutron-server`` container as well. Modify the
+configuration file ``/etc/kolla/kolla-build.conf`` and add the following
+contents:
+
+::
+
+    [neutron-server-plugin-networking-sfc]
+    type = git
+    location = https://github.com/openstack/networking-sfc.git
+    reference = mitaka
+
+Verification
+------------
+
+Verify the build and deploy operation of Networking-SFC container. Successful
+deployment will bring up an SFC container in the list of running containers.
+Run the following command to login into the ``neutron-server`` container:
+
+::
+
+    docker exec -it neutron_server bash
+
+Neutron should provide the following CLI extensions.
+
+::
+
+    #neutron help|grep port
+
+    port-chain-create                 [port_chain] Create a Port Chain.
+    port-chain-delete                 [port_chain] Delete a given Port Chain.
+    port-chain-list                   [port_chain] List Port Chains that belong
+                                      to a given tenant.
+    port-chain-show                   [port_chain] Show information of a
+                                      given Port Chain.
+    port-chain-update                 [port_chain] Update Port Chain's
+                                      information.
+    port-pair-create                  [port_pair] Create a Port Pair.
+    port-pair-delete                  [port_pair] Delete a given Port Pair.
+    port-pair-group-create            [port_pair_group] Create a Port Pair
+                                      Group.
+    port-pair-group-delete            [port_pair_group] Delete a given
+                                      Port Pair Group.
+    port-pair-group-list              [port_pair_group] List Port Pair Groups
+                                      that belongs to a given tenant.
+    port-pair-group-show              [port_pair_group] Show information of a
+                                      given Port Pair Group.
+    port-pair-group-update            [port_pair_group] Update Port Pair
+                                      Group's information.
+    port-pair-list                    [port_pair] List Port Pairs that belongs
+                                      to a given tenant.
+    port-pair-show                    [port_pair] Show information of a given
+                                      Port Pair.
+    port-pair-update                  [port_pair] Update Port Pair's
+                                      information.
+
+For setting up a testbed environment and creating a port chain, please refer
+to the following link:
+
+    https://wiki.openstack.org/wiki/Neutron/ServiceInsertionAndChaining
+
+For the source code, please refer to the following link:
+
+    https://github.com/openstack/networking-sfc