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OpenFlow Tutorial. Theophilus Benson. Outline. Components in an OpenFlow testbed Setting up a testbed Writing a new component C++ components version Python components version. OpenFlow Components. Controller Openflow switches Traffic generators. OpenFlow Enabled Switches. End host1.

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openflow tutorial

OpenFlow Tutorial

Theophilus Benson

outline
Outline
  • Components in an OpenFlow testbed
  • Setting up a testbed
  • Writing a new component
    • C++ components version
    • Python components version
openflow components
OpenFlow Components
  • Controller
  • Openflow switches
  • Traffic generators

OpenFlow Enabled Switches

End host1

End host3

End host2

OpenFlow Controller

virtual testbed
Virtual Testbed
  • Directions available online
    • http://noxrepo.org/manual/using.html#setting-up-a-noxnetwork
  • Requirements
    • Linux system
    • Qemu
    • Python
    • Nox code
    • Other linux libraries
testbed setup
Testbed Setup
  • Compile Nox code
  • Set up virtual machines
  • Connect topology
  • Start controller
    • Use appropriate components
  • Connect switches to controller
writing components
Writing Components
  • Two languages; c++ and python
    • More information found: http://noxrepo.org/manual/app.html
  • Components are stored in src/nox/apps
    • Separate each component into a distinct directory
  • Component Structure
    • You must inherit from class Component
    • You must include a call to the REGISTER_COMPONENT macro
    • You must include the following methods
      • Void configure(const Configuration *)
      • Void install()
component paradigm
Component Paradigm
  • Register for events and specify handlers
    • register_handler<eventtype>(boost::bind(handling_method, this, _1));
    • register_handler<Packet_in_event>(boost::bind(&Hub::handler, this, _1));
  • All work done in handler
    • Return either CONTINUE or END
    • NOTE: you can start the controller with a list of components, event get passed from one to the other
    • Returning CONTINUE means the next component handles the packet
    • Returning END means no other components handle the packets
slide8
Demo
  • Run component in openflow controller
  • Ping from endhost A
  • Should observe printouts in controller’s console
resources
Resources
  • Nox website
    • http://noxrepo.org
  • OpenFlow Site
    • http://www.openflowswitch.org/wp/documents