Build an OpenFlow switch using the Raspberry Pi
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Build an OpenFlow switch using the Raspberry Pi

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The Raspberry Pi is a low cost computer and you can use it to build your own OpenFlow switch for around $70 ! Learn about what you can and can't do with OpenFlow through experimentation. ...

The Raspberry Pi is a low cost computer and you can use it to build your own OpenFlow switch for around $70 ! Learn about what you can and can't do with OpenFlow through experimentation.

This share explains how to make the RPi useful since it is not useful as a switch with just 1 Ethernet port, what software to install (Erlang + LINC) and finally how to make your new switch useful since an OpenFlow switch is pretty useless without an OpenFlow controller.

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    Build an OpenFlow switch using the Raspberry Pi Build an OpenFlow switch using the Raspberry Pi Presentation Transcript

    • Steve Roberts Turning the Raspberry Pi into an OpenFlow Switch + =
    • Steve Roberts What is OpenFlow?  OpenFlow is a new concept in data networking  It's a way to implement Software Defined Networks (SDN)  It's a standard developed by the ONF  Google invented in and they use it  It's likely to be the future of IP networking
    • Steve Roberts Why is it new?  OpenFlow separates control plane from data plane  What does that mean?  The decision how packets are routed is handled separately from actually routing them  The decision how packets are routed can now be programmed
    • Steve Roberts So what?  Telecom networks separated control from data 20+ years ago  Separation allowed new services to be created like: freephone, virtualised switchboards, mobile phones...  OpenFlow will enable new services to be created in the data world  It will lower the price point for routing much like PC architecture did for computing  It will simplify networks
    • Steve Roberts Why OpenFlow on RPi?  OpenFlow is new, so experimentation is the best way to learn about it  Raspberry Pi is a cheap computer (~ $40)  Build your own OpenFlow switch or OpenFlow network so you can learn what OpenFlow can and can't do.
    • Steve Roberts The Raspberry Pi  Cheap (~ $40)  Runs Linux  1 Ethernet port  USB ports
    • Steve Roberts Switches and Routers  Ethernet switches and IP routers have more than 1 Ethernet port  To be a switch or router you need more than 1 port  RPi only has 1 Ethernet port  Solution: Use USB to add more ports
    • Steve Roberts Expanded RPi Rpi $40 USB to Ethernet adaptors $5 USB to WiFi adaptors $12 Total cost: $70 Spec: 3x Ethernet 1x WiFi http://openflow-sdn.blogspot.co.uk/2013/05/cheapest-openflow-switch-in-world-using.html
    • Steve Roberts Software  OpenFlow is attracting lots of Open Source attention with lots of high quality free software available.  My switch uses LINC from FlowForwarding  Why use LINC?  Free  Supports latest standards  I've been involved with it http://openflow-sdn.blogspot.co.uk/2013/05/openflow-switch-on-raspberry-pi-part-2.html
    • Steve Roberts LINC  Runs on Erlang  Easy to get Erlang running on Raspberry Pi  Download LINC from http://flowforwarding.org  Supports latest OpenFlow protocol (1.3)  Supports OpenFlow config protocol (OFC1.1)
    • Steve Roberts Typical OpenFlow Architecture OpenFlow Switch OpenFlow Controller Business Logic (Controller or controllers) (Applications eg Firewall) OpenFlow Switch OpenFlow Controller This is what the Raspberry Pi is Doing – it's a switch
    • Steve Roberts Now what?  An OpenFlow switch on it's own is useless  It does nothing without a controller  Possible to run controller software on the same Raspberry Pi or somewhere else in the network  Lots of free OpenFlow controller software out there.
    • Steve Roberts OpenFlow Controllers  Recommend to use the following with LINC  Ryu (http://osrg.github.io/ryu/)  Trema (http://trema.github.io/trema/)  Why?  These support the latest OF1.3 protocol.  Most other controllers are not as current  Start with Ryu when using LINC. I haven't tried Trema yet but it should work http://openflow-sdn.blogspot.co.uk/2013/05/openflow-switch-on-raspberry-pi-part-3.html
    • Steve Roberts What Next?  You can see more detail on how to build an OpenFlow switch on my blog http://openflow-sdn.blogspot.co.uk  I'm planning to write the controller for a WiFi access point supporting user authentication and user based routing  Port LINC to a RoutoBox  Feel free to contact me