Arista L3 Router Service Plugin

New L3 Router serice plugin to support hardware based routing on Arista
hardware.

Change-Id: I1eb5452947dd46b88329e218b50d3169b2645711

specs/juno/arista-l3-service-plugin.rst

@@ -0,0 +1,122 @@
+==========================================================================
+Layer 3 service plugin to support hardware based routing on Arista devices
+==========================================================================
+
+https://blueprints.launchpad.net/neutron/+spec/arista-l3-service-plugin
+
+This blueprint is to implement a L3 service plugin to support hardware based
+Layer 3 routing in Arista devices.
+
+
+Problem description
+===================
+
+This service plugin implements neutron L3 routing features on Arista hardware.
+It communicates with Arista hardware fabric over JSON RPC to automate
+the provisioning of routing on Arista devices (both at leaf and spine layer).
+
+
+Proposed change
+===============
+
+This proposal is to introduce a new Layer 3 service plugin that uses JSON RPC to
+to communicate with Arista hardware fabric to provide full L3 routing functionality.
+
+This plugin works in conjuction with Arista ML2 Driver, which manages the
+networks, subnets, and ports.
+This service plugin and ML2 Driver leverage the resources and topology knowledge
+to facilitate the automation of L2 and L3 provisioning in Arista hardware.
+
+Alternatives
+------------
+
+The alternative approach is to use the open source agent based layer 3 router
+plugin and update the L3 agent to interact with Arista Hardware.
+
+Data model impact
+-----------------
+None
+
+REST API impact
+---------------
+n.a
+
+Security impact
+---------------
+n.a
+
+Notifications impact
+--------------------
+n.a.
+
+Other end user impact
+---------------------
+n.a.
+
+Performance Impact
+------------------
+
+This service plugin is event based triggered. No polling is deployed.
+There are no changes to any existing code patterns. Note that the events here
+means invocation of the APIs.
+This plugin uses JSON RPC to communicate with Arista hardware. Arista ML2 Driver
+uses the same mechanism and implements bulk operations to support scale
+deployements. This plugin will leverage the same mechanisms.
+
+Other deployer impact
+---------------------
+
+Configuration knobs will be provided to the adminstrators to take advantage of
+various deployment topologies supported by Arista fabric. These configuration
+knobs will be documented on OpenStack wiki.
+
+Developer impact
+----------------
+n.a.
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Sukhdev Kapur
+sukhdev@arista.com
+IRC - Sukhdev
+
+Work Items
+----------
+
+* L3 Service Plugin
+* DevStack related enhancements to support this plugin
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+Complete unit test coverage of the code will be provided.
+
+For full tempest test coverage, Arista third party testing is implemented
+and is described at the following wiki.
+With implementation of this Plugin, the test list will be updated. For example,
+Floating IP related tests will be removed and L3 routing function tests will be
+included. The updated list of tests will be published.
+
+https://wiki.openstack.org/wiki/Arista-third-party-testing
+
+
+Documentation Impact
+====================
+Documentation to configure and deploy this service plugin will be provided
+in the Openstack wiki.
+
+
+References
+==========
+
+n.a.