OBS光突发交换简介

OpportunitiesandChallengesforOpticalBurstswitching,WhyOBS?backgroundandcharacterTheprincipleofOBSarchitectureofOBSnodeProtocolofOBScontentionresolutionopticalpacketassemblymechanismApplicationandfutureLOBS(LabelOpticalBurstSwitching),overview,today:IPover(ATM/SONET)overWDMtrend:IntegratedIP/WDM(withopticalswitching)goal:ubiquitous,scalableandfuture-proof,NetworkArchitectures,trend:IntegratedIP/WDM(withopticalswitching)goal:ubiquitous,scalableandfuture-proof,NetworkArchitectures,ProgressinOpticalNetworks,Capacity,Function,Ring,Mesh,Dynamic,Static,OpticalPacket,Pt-to-Pt,SingleChannel,WDM,OpticallyAmplified,OpticalAdd/Drop,Topology,ProgressinOpticalNetworks,Underthesamenetworkconditions,OBSnetworkscanachieve20%30%morethroughputthanthoseinOCSnetworks.,ThroughputcomparisonOBSvs.OCS,Data-centric+High-BandwidthPacket+OpticalmoderategranularityCost-effectiveservicedeliveryandflexibilityAvoidelectricalRAMandO/E/ObottleneckDRAMgettingfasteronlyby7%/yearO/E/OconversionconsumespowerandspaceScalabilityforfuturebandwidthgrowthsUseopticalparallelismforsimplerswitchingfabricFromATM/SONETtoIP/WDMparadigm,MotivationsforOpticalOBSSwitching,architectureofOBSnodeProtocolofOBScontentionresolutionopticalpacketassemblymechanism,PrincipleofOBS,WirelineO-CDMALAN,LegacyMAN,FreeSpaceandWirelineO-CDMALAN,OpticalCoreNetwork,Edgerouter,Edgerouter,OLSrouters,OLSswitches,StarCoupler,MAN,StarCoupler,MAN,Edgerouter,LegacyLAN,OLSswitches,SENSORNetworks,NextGenerationNetworkTopology,DEMUX,NC&M,LabelProcessing,Modules-CI,(LP-CI),CI,CI,CI,OLE,OLR,OLE,OLR,OLE,OLR,IPRouter,ATM,ClientMachine,UNAS,OLSEdgeRouter,ExampleofanOLSRforIP,ATMorclient-specifictrafic,RapidTuning(1nsec)ofT_WCtoachieveswitchinginWavelength,Time,SpacedomainsScalableto42Petabit/seccapacity32*(2562x2562)connectivity,T_WC,T_WC,T_WC,T_WC,F_WC,F_WC,F_WC,F_WC,switchcontrol,TunableWavelengthConverters,l-router(AWGR),controller,FixedWavelengthConverters,OpticalSwitchFabricusedinCoreRouters,OLSCoreandEdgeRouters,IPClientNetwork,OpticalLabelSwitchingNetwork,CoreRouter,EdgeRouter,POS,POS,EdgeRouter,CoreRouter,CoreRouter,PhysicalLayerInterface,Encapsulation,LabelprocessingUnit,Databustrafficcontroller,DataBus,SONET,PPP,PhysicalLayerInterface,Databustrafficcontroller,AOLSInterface,POSInterface,IngressPath,EgressPath,EdgeRouter,P1,P2,P3,P1,IPClient-to-IPClientwithCascadedOperationofOLSRs,TAG(tell-and-go)IBT(in-band-terminator)RFD(Reserve-a-Fixed-Time)JET(just-enough-time),OpticalBurstSwitchingProtocol,T(i)=T-(h),OpticalBurstSwitchingProtocol,BufferMemory,MAC,controller,Buffer,Schedule,andForwardElectronicRAM-DiverseFunctionsContentionResolution,Queuing,etcinTime,BufferMemory,MAC,BufferMemory,MAC,BufferMemory,MAC,ConventionalElectronicPacketSwitches,ContentionResolution,WavelengthdomainanewdimensionavailableinopticalnetworksnotinducetimingjitteroradditionallatencyTimedomainFDL:usesalimitednumberofdiscretefiberdelaylinesspacedomaindeflectionroutingmulti-techniquecombination:Moreeffective,packetarrives,contention?,lcont.res.?,timecont.res.?,spacecont.res.?,SendtoEdgeRouterforcont.res.ordrop,yes,no,no,no,forward,no,yes,yes,yes,S.Yao,S.J.B.Yoo,andB.Mukherjee,“Acomparisonstudybetweenslottedandunslottedall-opticalpacket-switchednetworkwithpriority-basedrouting,”OFC2001,#TuK2S.Yao,S.J.B.Yoo,B.Mukherjee,S.Dixit,“Hybridcontentionresolutionforanopticalpacket-switchednetworkwithself-similarIPtraffic,”APOC2001#4585-04.S.Yao,B.Mukherjee,S.J.BenYoo,andS.Dixit,“All-opticalPacket-switchingforMetropolitanAreaNetworks:OpportunitiesandChallanges,”IEEEComm.Magazine,vol.39,p.142-8(2001)S.J.B.Yoo,Y.Bansal,Z.Pan,J.Cao,V.K.Tsui,S.K.H.Fong,Y.Zhang,J.Taylor,H.J.Lee,M.Jeon,V.Akella,K.Okamoto,S.Kamei,“Optical-LabelSwitchingbasedPacketRoutingSystemwithContentionResolutionCapabilitiesinWavelength,Time,andSpaceDomains,”OFC2002,paper#WO2(2002).,ContentionResolutionAlgorithm,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket:ReachtheMaximumPayloadSize(MPS)ExpirationofAssemblyTime-outPeriod(T),OpticalPacketAssemblyMechanism,client,transport,TrafficShapingattheEdgeRoutersPacketlengthdistributionattheClientandattheCore,ElectronicATMNetwork,ElectronicIPNetwork,LAN,ElectronicIPNetwork,LAN,ApplicationandFuture-NetworkEvolution,ElectronicMPLSNetwork,ElectronicIPNetwork,LAN,ElectronicIPNetwork,LAN,ApplicationandFuture-NetworkEvolution,ElectronicMPLSNetwork,ElectronicMPLSNetwork,MPLambdaSNetwork,LAN,LAN,ApplicationandFuture-NetworkEvolution,OpticalLabelSwitchedNetwork,LAN,LAN,ApplicationandFuture-NetworkEvolution,ApplicationandFuture-NetworkEvolution,similartoMPLS(e.g.,d