201107 how beacon works
TRANSCRIPT
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