Software Define Network (SDN) and Openflow
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This document provides an overview of Software-Defined Networking (SDN) and OpenFlow. It defines SDN as separating the network control plane from the forwarding plane, allowing the control plane to control multiple devices using programmable software. OpenFlow is described as the first standard communication interface between the control and forwarding planes, with the forwarding plane on switches and routers communicating with controller servers through the OpenFlow protocol. Benefits of SDN mentioned include operational savings, central management, flexibility, improved uptime, and infrastructure savings.
Software Define Network (SDN) and Openflow
- 1. Software Define Network (SDN) and Openflow KHNOG October, 2015
- 2. Overview • Getting to know about SDN • Benefit of SDN • What SDN will help network engineer? • Understanding about Openflow • Demo
- 3. What is SDN? There are many definition about SDN is the technology enabling programmable networks Using software running in general purpose OS/Hardware The physical saperation of the network control plan from the forwarding plan, and where the control plan controls several devices - Open SDN (openflow) - SDN via API’s - SDN via Overlays (VMWare)
- 4. Network Infrastructure • No Practical way to experiment new network protocol • Most ideas from network research are untried and untested • Belief that the network infrastructure has “ossified” (unable to change) • Proprietary OS is running on proprietary Hardware • Network administrator difficult to manage different vendors devices
- 5. SDN Help? Operation Saving Central management Flexibility Improve uptime Infrastructure Saving
- 7. Software Control Router Hardware Datapath HELLO OSPF-TE RSVP-TE HELLOHELLO Firewall IPSec Many complex functions baked into the infrastructure OSPF, BGP, multicast, differentiated services, Traffic Engineering, NAT, firewalls, MPLS, redundant layers, …
- 8. Specialized Packet Forwarding Hardware Specialized Packet Forwarding Hardware A p p A p p A p p A p p A p p A p p Specialized Packet Forwarding Hardware Specialized Packet Forwarding Hardware A p p A p p A p p A p p A p p A p p Specialized Packet Forwarding Hardware Specialized Packet Forwarding Hardware A p p A p p A p p A p p A p p A p p Specialized Packet Forwarding Hardware Specialized Packet Forwarding Hardware A p p A p p A p p A p p A p p A p p Specialized Packet Forwarding Hardware Specialized Packet Forwarding Hardware Operating System Operating System Operating System Operating System Operating System Operating System Operating System Operating System Operating System Operating System A p p A p p A p p A p p A p p A p p Network Operating SystemNetwork Operating System AppApp AppApp AppApp Change is happening in non-traditional markets
- 9. AppApp Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware AppApp AppApp Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Simple Packet Forwarding Hardware Network Operating SystemNetwork Operating System 1. Open interface to hardware 3. Well-defined open API 2. At least one good operating system Extensible, possibly open-source The “Software-defined Network”
- 10. Windows (OS) Windows (OS) Linux Mac OS x86 (Computer) Windows (OS) AppApp LinuxLinux Mac OS Mac OS Virtualization layer App Controller 1 AppApp Controller 2 Virtualization or “Slicing” App OpenFlow Controller 1NOX (Network OS) Controller 2Network OS Trend Computer Industry Network Industry
- 11. Open SDN (Openflow) • First Standard communication interface (Control and Forward plan) • Forward plan reside on Switch, router • Control plan move to controller server • Openflow switch and controller communicate via Openflow protocol
- 13. Data Path (Hardware) Control PathControl Path (Software)
- 14. Data Path (Hardware) Control Path OpenFlow OpenFlow Controller OpenFlow Protocol (SSL/TCP)
- 15. Architecture
- 16. Controller PC Hardware Layer Software Layer Flow Table MAC src MAC dst IP Src IP Dst TCP sport TCP dport Action OpenFlow Firmware **5.6.7.8*** port 1 port 4port 3port 2port 1 1.2.3.45.6.7.8 OpenFlow Flow Table Abstraction
- 17. OpenFlow has been prototyped on…. • Ethernet switches • HP, Cisco, NEC, Quanta, + more underway • IP routers • Cisco, Juniper, NEC • Switching chips • Broadcom, Marvell • Transport switches • Ciena, Fujitsu • WiFi APs and WiMAX Basestations
- 19. Thanks