Software Defined Network (SDN) and Network Virtualization

A/Professor Vijay Sivaraman

School of Electrical Eng. & Telecoms.

University of New South Wales

http://www2.ee.unsw.edu.au/~vijay/

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Internet Growth

Aggregate traffic composition (*)

(*) North America, Fixed Access

Global Shares of YouTube and Real-Time Entertainment

In North-America’s fixed access network, Netflix is dominant

Fixed Network Traffic Projection – U.S.

Cost/Revenue for Service Providers

Source: Cisco Visual Networking Index Global Forecast, 2011

Source: Infonetics, Worldwide Service Provider Update, September 2010

20052006

20072008

20092010

20112012

20132014

2015

2.8 4.26.2

8.712.2

15.9

22.1

27.6

33.4

38.9

47.3

Monthly Internet Consump-tion per U.S. User

(in GB)

2Q06 2Q07 2Q08 2Q09 2Q10

$41.1 $41.4 $41.0 $41.0 $41.9

North American Cable Broadband ARPU

Imbalance in Revenue and Costs Internet Service Provider (ISP):

Increasing the cost of the infrastructure to carry the growing traffic volume

Revenues are relatively flat No per-stream revenues

Content Provider (CP): Large growth in revenue Frustrated by unpredictable delivery quality due to

bottlenecks in the network No visibility into network

Proposed Solution Rethink of business model:

Collaboration / partnership between ISP and CP ISP exposes quality control mechanism to CP

Dynamic provisioning CP pays ISP proportional to volume and quality

Dynamic pricing Revenue shared between ISP and CP

Technology Tool?

Software Defined Networking (SDN) Disruptive technology

Centralised control Global view of the network

Enables: Openness: exposure to external parties Network virtualization Dynamic resource partitioning (and charging)

Software Defined Networks (SDN)

Today’s networking Hardware, Operating

System, and Applications Built Into a “Box”

Closed equipment Complicated Distributed

control Delays on introducing

new feature by vendor High CapEx/OpEx

SDN based networking Separate hardware (data

plane) from software (control plane)

Open API (OpenFlow) Simpler Centralised

control Decreased cycle from

Lab to Production Commodity hardware and

Open-Source software

Vertically integratedClosed, proprietarySlow innovationSmall industry

SpecializedOperatingSystem

SpecializedHardware

AppAppAppAppAppAppAppAppAppAppApp

SpecializedApplications

HorizontalOpen interfacesRapid innovationHuge industry

Microprocessor

Open Interface

LinuxMacOS

Windows(OS) or or

Open Interface

Analogy: Computing

Vertically integratedClosed, proprietarySlow innovation

AppAppAppAppAppAppAppAppAppAppApp

HorizontalOpen interfacesRapid innovation

ControlPlane

ControlPlane

ControlPlane or or

Open Interface

SpecializedControlPlane

SpecializedHardware

SpecializedFeatures

MerchantSwitching Chips

Open Interface

Evolution of Routing/Switching

SDN: an industry change How SDN will shape networking:

Empower network operators Better visibility and control over network

Increase pace of innovation Can introduce new ideas with software changes

Diversity of supply chain Commodity switching elements

Use-case1: SDN at Google Google: 6.4% of all Internet traffic

[ATLAS 2010 Traffic Report, Arbor Networks] Google has two large backbone networks:

Internet-facing backbone (user traffic): I-Scale Smooth / diurnal

Datacenter backbone (internal traffic): G-Scale Bursty / bulk

Google WAN intensive applications: YouTube; Maps; Web Search Google+; Photos Android and Chrome updates; AppEngine

Google’s SDN WAN• Centralised TE:

– Higher efficiency with global visibility– Deterministic behaviour– Supports Innovation and more robust SW development

Use-case2: Access Network Virtualization

Conclusions Today’s business model is unsustainable Software Defined Networking (SDN)

disruptive technology Simplifies management by centralising control Enables innovation via software Allows creation of new business models Increasing adoption by

Equipment vendors (Cisco, HP, etc.) Data centres (VMWare) Content provider backbone networks (Google) Internet Service Providers

Now is the time to think about how SDN impacts your network architecture

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