A survey of SDN: Past, Present and Future of Programmable Networks Speaker :Yu-Fu Huang Advisor :Dr. Kai-Wei Ke Date:2014/Sep./30 1

Outline  Current internet architecture  Software Defined Network (SDN)  OpenFlow architecture  SDN application via OpenFlow architecture  Research Challenges and Future Directions  References 2

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4 Current Network Device

5 Current Network is closed

Internet Ossification  Internet is built from a large number of network devices:  Routers, switches, numerous types of middleboxes and many complex protocols  Simplified best-effort distributed network functions are implemented in vertical-integrated black boxes.  Network management & performance tuning are quite challenging. 6

Internet Evolvement 7 SDN & (HSN & Digital Convergence) Smart Devices (IOT) Cloud Services

Software Defined Network  Forwarding hardware (data plane) is decoupled from control decisions (control plane).  Data plane can be programmed via an open interface like OpenFlow.  So, SDN is a Programmable network.  Network resources virtualization.  Controller can be viewed as a Network Operating System. 8

SDN Architecture 9

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SDN Architecture 11 API Network Resources (Virtualization like) (PC memory & Storage) NOS Commodity Like PC 3’rd party applications

SDN Architecture 12

13 Open Source Controllers

14 Floodlight NB APIs

15 OpenDaylight NB APIs

Benefits of SDN  Centralized control  Simplified algorithms  Commoditizing network hardware  Eliminating middleboxes  Enabling the design & deployment of 3’rd party applications 16

Core Values of SDN Reduced Opex Innovative Services Reduced Capex 17

OpenFlow Architecture 18

OpenFlow Switch 19

Elements of an OpenFlow-compliant switch 20

Matching Field of a Flow table entry 21

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Capabilities of OpenFlow  Centralized control of the network  Software-based traffic analysis  Dynamic updating of forwarding rules  Flow abstraction 23

Difference between SDN & OpenFlow  SDN abstracts the whole Network-wide state like OS to PC.  OpenFlow abstracts a Network component like Diver to OS. 24

Core Capabilities of SDN Dynamic adjustment via Software Programming Network- Aware Controller 25

SDN Applications via OpenFlow 26  Ease of configuration  Network management  Security  Availability  Load balance  Fault tolerance  Network virtualization

SDN Applications via OpenFlow 27  Ease of configuration  Data center virtualization  Wide area network application  Wireless application  Other application

Packet & Circuit Network Convergence with OpenFlow 28

OpenFlow Unified Architecture 29

Unified abstraction for packet & circuit switches 30

Research Challenges and Future Directions  Controller and Switch Design  Software-Defined Internetworking  Controller-Service Interaction  Virtualization and Cloud Services  Information-Centric Networking  Heterogeneous Network Support 31

References  Bruno Astuto A. Nunes, Marc Mendonca, Xuan-Nam Nguyen, Katia Obraczka and Thierry Turletti, “A Survey of Software-Defined Networking: Past, Present, and Future of Programmable Networks” hal , version 5-19 Jan  Adrian Lara, Anisha Kolasani, and Byrav Ramamurthy, “Network Innovation using OpenFlow: A Survey” IEEE communication surveys & tutorials,

References  Saurav Das, Guru Parulkar, Nick McKeown, “Packet and Circuit Network Convergence with OpenFlow” Department of Electrical Engineering, Stanford University, California 94305, USA. 33

Thanks for listening 34