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+.. OPNFV - Open Platform for Network Function Virtualization
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+
+***********************************************************************
+Fast Data Stacks Scenario: os-odl_l2-fdio-noha Overview and Description
+***********************************************************************
+
+Scenario: "OpenStack - Opendaylight (L2) - FD.io" (apex-os-odl_l2-fdio-noha)
+is a scenario developed as part of the FastDataStacks
+OPNFV project.
+
+.. toctree::
+   :numbered:
+   :maxdepth: 2
+
+   scenario.description.rst
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+.. OPNFV - Open Platform for Network Function Virtualization
+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Scenario: "OpenStack - OpenDaylight (Layer 2) - FD.io"
+======================================================
+
+Scenario: apex-os-odl_l2-fdio-noha
+
+"apex-os-odl_l2-fdio-noha" is a scenario developed as part of the
+FastDataStacks OPNFV project. The main components of the
+"apex-os-odl_l2-fdio-noha" scenario are:
+
+ - APEX (TripleO) installer (please also see APEX installer documentation)
+ - Openstack (in non-HA configuration)
+ - OpenDaylight controller controlling layer 2 networking
+ - FD.io/VPP virtual forwarder for tenant networking
+
+Scenario Overview
+==================
+
+Basics
+------
+
+The "Openstack - OpenDaylight - FD.io/VPP" scenario provides the capability to
+realize a set of use-cases relevant to the deployment of NFV nodes instantiated
+by means of an Openstack orchestration system on FD.io/VPP enabled compute
+nodes. The role of the Opendaylight network controller in this integration is
+twofold. It provides a network device configuration and topology abstraction
+via the Openstack Neutron interface, while providing the capability to realize
+more complex network policies by means of Group Based Policies. Furthermore it
+also provides the capabilities to monitor as well as visualize the operation of
+the virtual network devices and their topologies.
+In supporting the general use-case of instantiatiting an NFV instance, two
+specific types of network transport use cases are realized:
+
+  * NFV instances with VPP data-plane forwarding using a VLAN provider network
+  * NFV instances with VPP data-plane forwarding using a VXLAN overlay
+    transport network
+
+A deployment of the "apex-os-odl_l2-fdio-noha" scenario consists of 4 or more
+servers:
+
+  * 1 Jumphost hosting the APEX installer - running the Undercloud
+  * 1 Controlhost, which runs the Overcloud as well as OpenDaylight
+    as a network controller
+  * 2 or more Computehosts
+
+.. image:: FDS-ODL_L2-overview.png
+
+Tenant networking leverages FD.io/VPP. Open VSwitch (OVS) is used for all other
+connectivity, in particular the connectivity to public networking / the
+Internet (i.e. br-ext) is performed via OVS as in any standard OpenStack
+deployment. The OpenDaylight network controller is used to setup and manage
+layer 2 networking for the scenario. Tenant networking can either leverage
+VXLAN (in which case a full mesh of VXLAN tunnels is created) or VLANs. Layer 3
+connectivity for a tenant network is provided centrally via qrouter on the
+control node. As in a standard OpenStack deployment, the Layer3 agent
+configures the qrouter and associated rulesets for security (security groups)
+and NAT (floating IPs). Public IP network connectivity for a tenant network is
+provided by interconnecting the VPP-based bridge domain representing the tenant
+network to qrouter using a tap interface. The setup is depicted below:
+
+.. image:: FDS-L3-tenant-connectivity.png
+
+Features of the scenario
+------------------------
+
+Main features of the "apex-os-odl_l2-fdio-noha" scenario:
+
+  * Automated installation using the APEX installer
+  * Fast and scalable tenant networking using FD.io/VPP as forwarder
+  * Layer 2 networking using VLANs or VXLAN, managed and
+    controlled through OpenDaylight
+  * Layer 3 connectivitiy for tenant networks supplied centrally on
+    the Control node through standard OpenStack mechanisms.
+    All layer 3 features apply, including floating IPs (i.e. NAT)
+    and security groups.
+  * Manual and automatic (via DHCP) addressing on tenant networks
+
+Software components of the scenario
+---------------------------------------
+
+The apex-os-odl_l2-fdio-noha scenario combines components from three key open
+source projects: OpenStack, OpenDaylight, and Fast Data (FD.io). The key
+components that realize the apex-os-odl_l2-fdio-noha scenario and which differ
+from a regular, OVS-based scenario, are the OpenStack ML2 OpenDaylight plugin,
+OpenDaylight Neutron Northbound, OpenDaylight Group Based Policy, OpenDaylight
+Virtual Bridge Domain Manager, FD.io Honeycomb management agent and FD.io
+Vector Packet Processor (VPP).
+
+Here's a more detailed list of the individual software components involved:
+
+**Openstack Neutron ML2 ODL Plugin**: Handles Neutron data base synchronization
+and interaction with the southbound Openstack controller using HTTP.
+
+**OpenDaylight Neutron Nothbound & Neutron MD-SAL Entry Store**: Presents a
+Neutron (v2) extended HTTP API servlet for interaction with Openstack Neutron.
+It validates and stores the received Neutron data in the MD-SAL data store
+against the Neutron yang model driven.
+
+**OpenDaylight Neutron Mapper**: The Neutron Mapper listens to Neutron data
+change events and is responsible for using Neutron data in creating Group Based
+Policy Data objects, e.g. GBP End-Points, Flood-Domains. A GBP End Point
+represents a specific NFV/VM port and its identity as derived from a Neutron
+Port. The mapped data is stored using the GBP End Point yang model and an
+association between the GBP End-Point and its Neutron object is maintained in
+the Neutron-GBP map.
+
+**OpenDaylight Group Based Policy (GBP) Entities store**: Stores for the GBP
+data artifacts against the GBP YANG schemas.
+
+**Neutron Group Based Policy Map store**: Stores the bi-lateral relation
+between an End-Point and its corresponding Neutron object. Neutron-GBP map;
+keyed by Neutron object type, port, and Neutron UUID, gives the GBP End-Point,
+Flood domain respectively. GBP-Neutron map keyed by GBP object type, end-point.
+
+**Neutron VPP Renderer Mapper**: The Neutron VPP Renderer Mapper listens to
+Neutron Store data change events, as well as being able to access directly the
+store, and is responsible for converting Neutron data specifically required to
+render a  VPP node configuration with a given End Point, e.g. the virtual host
+interface name assigned to a vhostuser socket.. The mapped data is stored in
+the VPP info data store.
+
+**VPP Info Store**: Stores VPP specific information regarding End-Points, Flood
+domains with VLAN, etc.
+
+**GBP Renderer Manager**: The GBP Renderer Manager is the central point for
+dispatching of data to specific device renderers.  It uses the information
+derived from the GBP end-point and its topology entries to dispatch the task of
+configuration to a specific device renderer by writing a renderer policy
+configuration into the registered renderer's policy store. The renderer manager
+also monitors, by being a data change listener on the VPP Renderer Policy
+States, for any errors in the application of a rendered configuration.
+
+**Renderer Policy Config Store**: The store's schema serves as the API between
+the Renderer Manager and specific Renderers like the VPP Renderer. The store
+uses a a YANG modeled schema to represent all end-point and associated GBP
+policy data.
+
+**Topology Entries Store**: The yang model based MD-SAL topology store serves
+two fundamental roles: 1. It maintains a topological representation of the GBP
+End Points, in the context of customer networks. 2. It maintains an association
+of each (VPP) compute node's physical interfaces to their neutron provider
+network (e.g. The association between an ethernet interface and a Neutron
+provider network).
+
+**VPP Renderer**: The VPP Renderer registers an instance for VPP nodes with the
+Renderer Manager by means of inserting operational data into the Renderer
+Policy config store. It acts as a listener on the Renderer Policy consumes via
+the GBP Policy API data + the specific VPP End Point data, to drive the
+configuration of VPP devices using NETCONF Services.
+More specifically, the renderer generates:
+
+  * vhost user port configuration that corresponds to the VM port configuration
+  * VPP bridge instances corresponding to the GBP flood domain
+  * port or traffic filtering configuration, in accordance with the GBP policy.
+
+The VPP Renderer also interacts with the Virtual Bridge Domain Service, by
+means of the VBD store, in order to establish connectivity between VPP nodes in
+a bridge domain. For this it uses the VPP device name, and the flood domain
+data derived from the VPP Info and End-Point data respectively.  For the
+executed configuration operations it updates state in the Renderer policy state
+store.
+
+**Virtual Bridge Domain (VBD) Store and Manager**: The virtual bridge domain
+manager is responsible for configuring the VxLAN overlay tunnel infrastructure
+to arrive at a desired bridged topology between multiple (VPP) compute nodes.
+VDB configures VXLAN tunnels always into a full-mesh with split-horizon group
+forwarding applied on any domain facing tunnel interface (i.e. forwarding
+behavior will be that used for VPLS).
+
+**NETCONF Mount Point Service & Connector**: Collectively referred to as
+Netconf Services, provide the NETCONF interface for accessing VPP configuration
+and operational data stores that are represented as NETCONF mounts.
+
+**Virtual Packet Processor (VPP) and Honeycomb server**: The VPP is the
+accelerated data plane forwarding engine relying on vhost user interfaces
+towards Virtual Machines created by the Nova Agent. The Honeycomb NETCONF
+configuration server is responsible for driving the configuration of the VPP,
+and collecting the operational data.
+
+**Rendered Policy State Store**: Stores data regarding the execution of
+operations performed by a given renderer.
+
+**Nova Agent**: The Nova Agent, a sub-component of the overall Openstack
+architecture, is responsible for interacting with the compute node's host
+Libvirt API to drive the life-cycle of Virtual Machines. It, along with the
+compute node software, are assumed to be capable of supporting vhost user
+interfaces.
+
+The picture below show a basic end to end call flow for creating a Neutron
+vhostuser port on VPP using a GBP renderer. It showcases how the different
+component described above interact.
+
+.. image:: FDS-basic-callflow.jpg
+
+Scenario Configuration
+======================
+
+To enable the "apex-os-odl_l2-fdio-noha" scenario check the appropriate
+settings in the APEX configuration files. Those are typically found in
+/etc/opnfv-apex.
+
+File "deploy_settings.yaml" choose opendaylight as controller with version
+"boron" and enable vpp as forwarder::
+
+  global_params:
+    ha_enabled: false
+
+  deploy_options:
+    sdn_controller: opendaylight
+    sdn_l3: false
+    odl_version: boron
+    tacker: false
+    congress: false
+    sfc: false
+    vpn: false
+    vpp: true
+
+Notes and known issues
+======================