OVS/BaGPipe driver

Introduction

The BaGPipe driver for the BGPVPN service plugin is designed to work jointly with the openvswitch ML2 mechanism driver.

It relies on the use of the bagpipe-bgp BGP VPN implementation on compute nodes and the MPLS implementation in OpenVSwitch.

Architecture overview

The bagpipe driver for the BGPVPN service plugin interacts with the openvswitch agent on each compute node, which is extended to support new RPCs to trigger the local configuration on compute nodes of BGP VPN instances and of their MPLS dataplane.

blockdiag BGPVPN API Neutron DB bagpipe driver on each compute node ... : OpenVSwitch Agent + BGPVPN extension OVS br-int/br-tun OVS br-mpls bagpipe-bgp BGP Peers MPLS routers admin, tenant RPCs packets MPLS or .. MP-BGP BGPVPN service plugin bagpipe backend

Limitations

On DHCP ports, Router interface ports, external network ports, etc.

No connectivity will be setup with BGP VPNs for DHCP ports or Router interface ports, or other network specific ports. This improves the load on network nodes by avoiding them to import/export a significant amount of routes, without limiting BGP VPN deployment scenarios because no useful traffic would be exchanged between a router or DHCP interface of a network associated to a BGP VPN.

Similarly, the driver will not bind a port on an external network. This behavior will be revisited once a use case is well identified.

How to use ?

On an Openstack Installation

[TBC (package installation + config)]

In devstack

  • follow the instruction in README.rst

  • local.conf:

    • add the following to enable the BaGPipe driver for the BGPVPN service plugin:

      NETWORKING_BGPVPN_DRIVER="BGPVPN:BaGPipe:networking_bgpvpn.neutron.services.service_drivers.bagpipe.bagpipe.BaGPipeBGPVPNDriver:default"

    • enable networking-bagpipe, which contains code for agent extensions:

      enable_plugin networking-bagpipe git://git.openstack.org/openstack/networking-bagpipe.git
# enable_plugin networking-bagpipe git://git.openstack.org/openstack/networking-bagpipe.git stable/ocata

  • on a control node, if you want to run the Fake Route-Reflector there (relevant only for a multinode setup):

    enable_service b-fakerr

  • on compute nodes:

    • the compute node Neutron agent is the Neutron openvswitch agent, with the bagpipe_bgpvpn agent extension:

      • install networking-bagpipe (the code to interact with bagpipe-bgp comes from there):

        enable_plugin networking-bagpipe git://git.openstack.org/openstack/networking-bagpipe.git
# enable_plugin networking-bagpipe git://git.openstack.org/openstack/networking-bagpipe.git stable/ocata

      • define Q_AGENT=openvswitch in local.conf (optional, this is actually the default now)

      • the bagpipe_bgpvpn agent extension is automatically added to the agent configuration by the devstack plugin

    • bagpipe-bgp will be installed automatically (part of networking-bagpipe since Pike, or as a submodule before)

    • you need to enable and configure bagpipe-bgp, typically with a peering to a BGP Route-Reflector or BGP router(s):

      enable_service b-bgp

BAGPIPE_DATAPLANE_DRIVER_IPVPN=mpls_ovs_dataplane.MPLSOVSDataplaneDriver
# BAGPIPE_DATAPLANE_DRIVER_IPVPN=ovs # simpler config available > after Ocata

# IP of your route-reflector or BGP router, or fakeRR
# BAGPIPE_BGP_PEERS defaults to $SERVICE_HOST, which will point to the controller in a
# multi-node devstack setup
#BAGPIPE_BGP_PEERS=1.2.3.4,2.3.4.5