1. Software Defined Network (SDN) and Network Virtualization
A/Professor Vijay Sivaraman
School of Electrical Eng. & Telecoms.
University of New South Wales

2. Internet Growth

3. Aggregate traffic composition (*)
(*) North America, Fixed Access

4. Global Shares of YouTube and Real-Time Entertainment
In North-America’s fixed access network, Netflix is dominant

5. Fixed Network Traffic Projection – U.S.

6. Cost/Revenue for Service Providers
Source: Cisco Visual Networking Index Global Forecast, 2011
Source: Infonetics, Worldwide Service Provider Update, September 2010

7. 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

8. 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

9. Technology Tool? Software Defined Networking (SDN) Centralised control
Disruptive technology
Centralised control
Global view of the network
Enables:
Openness: exposure to external parties
Network virtualization
Dynamic resource partitioning (and charging)

10. Software Defined Networks (SDN)
Today’s networking
SDN based 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
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

11. Analogy: Computing Vertically integrated Horizontal Open interfaces
App
Specialized
Applications
Linux
Mac OS
Windows
(OS) or
Open Interface
Specialized
Operating
System
Microprocessor
Open Interface
Specialized
Hardware
Vertically integrated
Closed, proprietary
Slow innovation
Small industry
Horizontal
Open interfaces
Rapid innovation
Huge industry

12. Evolution of Routing/Switching
App
Specialized
Features
Control
Plane or
Open Interface
Specialized
Control
Plane
Merchant
Switching Chips
Open Interface
Specialized
Hardware
Vertically integrated
Closed, proprietary
Slow innovation
Horizontal
Open interfaces
Rapid innovation

13. 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

14. 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

15. Google’s SDN WAN Centralised TE:
Higher efficiency with global visibility
Deterministic behaviour
Supports Innovation and more robust SW development

16. Use-case2: Access Network Virtualization

17. 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