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+..
+  Copyright 2016 Canonical
+
+  This work is licensed under a Creative Commons Attribution 3.0
+  Unported License.
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
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+
+=========================
+External Networking REDUX
+=========================
+
+Refactor neutron-gateway and neutron-openvswitch charms to support more
+flexible configuration of 'external' north/south traffic routing to
+tenant networks.
+
+Problem Description
+===================
+
+The neutron-gateway and neutron-openvswitch charms currently support the
+'ext-port' configuration option to plumb the Open vSwitch br-ex bridge
+into the external/public network.
+
+OpenStack switched to a more flexible way of doing this a few cycles back,
+and the use of the default 'br-ex' == external network approach is
+officially deprecated.
+
+We need to refactor the charms to support the reference way of configuring
+external networking, which provides more flexibility than the current
+approach but does require more knowledge of Neutron.
+
+Use Cases
+---------
+
+Using the reference approach to external networking, its possible to have
+multiple external networks served from the same set of neutron gateway
+units, potentially on the same physical network with VLAN segmentation:
+
+.. code-block:: bash
+
+    neutron net-create --provider:network_type vlan \
+                       --provider:segmentation_id 400 \
+                       --provider:physical_network physnet1 --shared external
+
+    neutron net-create --provider:network_type vlan \
+                       --provider:segmentation_id 401 \
+                       --provider:physical_network physnet1 --shared \
+                       --router:external=true floating
+
+    neutron router-gateway-set provider floating
+
+
+with the associated neutron-gateway configuration:
+
+.. code-block:: bash
+
+    neutron-gateway:
+        bridge-mappings:         physnet1:br-data
+        data-port:               br-data:eth1
+
+Proposed Change
+===============
+
+Both the neutron-gateway and neutron-openvswitch charms will need to be
+updated to support this change; for now the 'ext-port' configuration will
+be deprecated for backwards compatibility with existing installations
+preserving current behaviour.
+
+The existing 'data-port' configuration option will be used instead to
+configure bridge-mappings and connectivity to physical network ports
+on the units deployed.
+
+Alternatives
+------------
+
+No alternatives.
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  james-page
+
+Additional contributors:
+  lathiat (Trent Lloyd)
+
+Gerrit Topic
+------------
+
+Use Gerrit topic "ext-net-redux" for all patches related to this spec.
+
+.. code-block:: bash
+
+    git-review -t ext-net-redux
+
+Work Items
+----------
+
+- Updates for neutron-gateway charm
+- Updates for neutron-openvswitch charm
+- Updates for openstack-charm-testing to configure external networking
+  in the new style.
+- Updates to Mojo specifications for new style configuration.
+- Updates to official bundles with details on new configuration for
+  external networking.
+
+Repositories
+------------
+
+None required.
+
+Documentation
+-------------
+
+README's in impacted charms will be updated with details on how to
+configure external networking.
+
+Security
+--------
+
+No additional security requirements.
+
+Testing
+-------
+
+Unit tests will be used to validate the code; Mojo specifications will
+be updated to use the new style of external networking configuration
+along with openstack-charm-testing.
+
+Dependencies
+============
+
+- No additional dependencies for this specification.
+
+References
+----------
+
+- https://bugs.launchpad.net/neutron/+bug/1491668
+- http://docs.openstack.org/mitaka/networking-guide/scenario-classic-ovs.html