How Beacon Works David Erickson July 2011. The Bundle Basic Building Block JAR (zipfile) May Contain – Metadata* META-INF/MANIFEST.MF – Java Classes –

How Beacon WorksDavid Erickson

July 2011

The Bundle• Basic Building Block• JAR (zipfile)• May Contain

– Metadata*• META-INF/MANIFEST.MF

– Java Classes– Resources (xml, etc)– Other JAR files

Bundle

* Required

• Many Bundles

• Working togetherBeacon

Beacon is…

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What can Bundles do?• Share their Java Packages

– Export-Package: net.beaconcontroller.core

• Consume other Java Packages– Import-Package: org.openflow.protocol

• Extend other Bundles– Fragments

• Run Codepublic void start() {        listenSock = ServerSocketChannel.open();        new Thread(...)        ...}

Advanced Bundles• Dynamic

– Stop, Start, Install, Replace while running

• Versioned– Can have multiple versions live simultaneously

• Explicit Dependencies– State which version(s) you need

What Bundles are available?• Third party, basically anything

– Just a JAR file with Metadata– Some may need YOU to generate the Metadata– Logging, Web Server, JSON parsing, Web framework, etc

• Beacon centric– OpenFlowJ (OF 1.0 Protocol)– Packet encoder/decoder (Ethernet, ARP, IPv4, LLDP, TCP, UDP)– Core, Learning Switch, Hub, Device Manager– Topology, Layer 2 Shortest Path Routing– ARP Proxy, DHCP Proxy, Multicast eliminator– Declarative routing (upload a text file)– Web UI

How do Bundles interact?• Service Registry

Topology Routing

Service Registry

ITopologyService

Publishes Consumes

• Core bundle connects switches• Core publishes IBeaconProvider• Other bundles use IBP

• Creates a pipeline…

protected IBeaconProvider beaconProvider;     public void startUp() {        beaconProvider.addOFMessageListener(OFType.PACKET_IN, this);    }

How does the core work?

Core

LearningSwitch

IBeaconProvider

“PacketIns Please!”

public Command receive(IOFSwitch sw, OFMessage msg) {        OFPacketIn pi = (OFPacketIn) msg; …                 return Command.CONTINUE;}

Pipeline

Core PacketIn

Decode

Stats

ETC

DeviceManager Topology Routing

PacketIn

PacketIn

Fully Multithreaded

Core

PacketIn

Decode

DeviceManager Topology Routing

Thread

Thread

Thread

• Not as far as we can tell• Only gets faster, free JVM improvements

But wait isn’t Java slow?

Cbench Test, part of Oflops suite– PacketIn to PacketOut/FlowMod

throughput test, fills controller input buffers

– 10 loops, 32 switches, 10s per loop

Test Machine– CPU: 1 x Intel Core i7 930 @ 3.33ghz,

9GB RAM, Ubuntu 10.04.1 x64

Controllers– Beacon, NOX (Destiny branch), Maestro

http://www.openflow.org/wk/index.php/Controller_Performance_Comparisons

Web UI Demo

Web UI Demo

Stable?

• Powering commercial controller offering– Multiple test deployments including Stanford’s network

• Running DNRC– 100 switches– Last 8 months

• Powering multiple internal and external research projects

• No known critical bugs

Resources

• Wiki– https://openflow.stanford.edu/display/Beacon/Home

• Bugtracker– https://openflow.stanford.edu/bugs/browse/BEACON

• Forum– https://openflow.stanford.edu/forums/forum/4-beacon-general/

• Web Code Browser (At 1.0 release..)• ME! Active development