SDN-NOX原版完整课件.pptx

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1、NOX:Towards an Operating System for NetworksNatashaGude,TeemuKoponen,JustinPettit,BenPfaff,MartnCasado,NickMcKeown,ScottShenkerSIGCOMMCCR,2008PresentedbyYeTianforCourseCS05112OverviewBackgroundandMotivationNOXOverviewProgrammingInterfaceExampleApplicationsReviewBackgroundEnterprisenetworkiscomplex,h

2、ardtomanageManydevicesDifferentvendorsVariousprotocolsVariousservicesandrequirementsAnAnalogywithOSInearlydays,programswerewritteninmachinelanguagesNocommonabstractionsfortheunderlyingphysicalresources.Programsarehardtowrite,port,reasonabout,anddebug.ModernoperatingsystemsFacilitateprogramdevelopmen

3、tProvidecontrolledaccesstohigh-levelabstractionsforresourcesPanasonicHHC,1981MotivationNetworksaremanagedthroughlow-levelconfigurationofindividualcomponents.BlockingauserwithACL:needtoknowntheuserscurrentIPaddressForcingport80traffictoHTTPproxyrequiresextensiveknowingthecurrentnetworktopologyAnenter

4、prisenetworkresemblesacomputerwithoutanoperatingsystem,Network-dependentcomponentconfigurationissimilartohardware-dependentmachine-languageprogramming.MotivationNeedanetworkoperatingsystemprovidestheabilitytoobserveandcontrolanetwork.Doesnotmanagethenetworkitself,butprovidesaprogrammaticinterface.Ap

5、plicationsimplementedontopofthenetworkoperatingsystemperformtheactualmanagementtasks.MotivationWhatsthedifference?Presentsprogramswithacentralizedprogrammingmodel;programsarewrittenasiftheentirenetworkwerepresentonasinglemachine.Programsarewrittenintermsofhigh-levelabstractions(e.g.,userandhostnames),notlow-levelconfigurationparameters(e.g.,IPandMACaddresses).Thesolution:NOXAvailableathttps:/