1.
HUAWEI TECHNOLOGIES CO., LTD.
Security Level:
www.huawei.com
Role of SDN Controllers in
OpenStack
Author/ Email: Vikram Choudhary (Huawei)
Numan Siddique (RedHat)

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What’s there in the plate?
 Background preparation
 SDN Controllers
 OpenStack
 Neutron
 SDN Controller’s & Openstack: Big Picture
 SDN controller’s for Openstack
 OpenDaylight
 OpenContrail
 Open Networking Operating System
 Many more…
 How to become part of OpenStack?
 Q/A

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Background before deep dive

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What is a SDN Controller?
An SDN controller is an application in
software-defined networking (SDN)
that manages flow control to enable
intelligent networking.
SDN controllers are based on
protocols, such as OpenFlow, that
allow servers to tell switches where
to send packets.

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Word about OpenStack
o OpenStack can be considered to
be not one project but several,
consisting of compute, storage
and networking.
o All three platform components
are managed by a dashboard
Web application.
o Combined, they can provide a
complete cloud network
operating system.

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OpenStack module to talk about: Neutron
o Neutron was introduced to treat
networking as a separate service.
o Can run as an autonomous service,
exposes APIs with different
vendors, provides implementations
by appropriate extensions.
o In short, neutron is NOT SDN, but
in theory can transform anything
into SDN, Just provide a plug-in for
it.

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Big Picture

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SDN Controller and OpenStack

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 OpenStack Neutron, with its plug-in architecture, provides the ability to integrate SDN
controllers into the OpenStack. provides centralized management, and facilitates the
network programmability using APIs.
 OpenStack is relatively mature and is in use in production environments worldwide.
This enables organizations to take advantage of the network orchestration feature
without necessarily deploying a full-blown controller-led SDN solution.
 Different integration options:
 Completely eliminate RPC communications between the Neutron server and agents on the
compute node, with the SDN controller being the sole entity managing the network.
 SDN controller manages only the physical switches, and the virtual switches can
be managed from the Neutron server directly.

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SDN controller’s for Openstack

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 OpenDaylight is integrated with Openstack via a Neutron plug-in.
 Plug-in moves the complexity up the stack from OpenStack to OpenDaylight.

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Status in Openstack:
ODL ML2 driver available in Icehouse release
• Supports VXLAN and GRE
• Devstack
• Focus on core Neutron Functionality, still use DHCP, L3 Agents
ODL ML2 in Kilo (current)
• Changed auth to basic auth
• Vendor decomposition – networking-odl in OpenStack big tent
• Added support for L3 Service, FWaaS, LBaaS

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The OpenContrail Controller is a logically centralized but
physically distributed Software Defined Networking (SDN)
controller that is responsible for providing
 Management
 Control, and
 Analytics functions of the virtualized network.

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 OpenContrail is integrated with Openstack via a Neutron plug-in.

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Status in Openstack:
ODL ML2 driver available

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A new carrier-grade SDN network
operating system designed for
 high availability
 performance
 scale-out.
Mission: “to produce the Open Source
Network Operating System that will
enable service providers to build real
Software Defined Network”

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Status in Openstack:
Just arrived 
 Work in Progress
o https://bugs.launchpad.net/networking-onos/+bug/1474240
o https://github.com/openstack/networking-onos

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Inputs for new SDN controller’s for
joining the party!

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 https://github.com/openstack/neutron/blob/master/doc/source/devref/sub_proje
cts.rst
 http://docs.openstack.org/infra/manual/creators.html#add-new-repository-to-
the-governance-repository

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Keep the thinking Hat On, many more
to come!
Thanks 