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1、OpportunitiesandChallengesforOpticalBurstswitching WhyOBS backgroundandcharacterTheprincipleofOBSarchitectureofOBSnodeProtocolofOBScontentionresolutionopticalpacketassemblymechanismApplicationandfutureLOBS LabelOpticalBurstSwitching overview today IPover ATM SONET overWDMtrend IntegratedIP WDM witho
2、pticalswitching 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 Opticall
3、yAmplified OpticalAdd Drop Topology ProgressinOpticalNetworks Underthesamenetworkconditions OBSnetworkscanachieve20 30 morethroughputthanthoseinOCSnetworks ThroughputcomparisonOBSvs OCS Data centric High BandwidthPacket OpticalmoderategranularityCost effectiveservicedeliveryandflexibilityAvoidelectr
4、icalRAMandO E ObottleneckDRAMgettingfasteronlyby7 yearO E OconversionconsumespowerandspaceScalabilityforfuturebandwidthgrowthsUseopticalparallelismforsimplerswitchingfabricFromATM SONETtoIP WDMparadigm MotivationsforOpticalOBSSwitching architectureofOBSnodeProtocolofOBScontentionresolutionopticalpac
5、ketassemblymechanism PrincipleofOBS WirelineO CDMALAN LegacyMAN FreeSpaceandWirelineO CDMALAN OpticalCoreNetwork Edgerouter Edgerouter OLSrouters OLSswitches StarCoupler MAN StarCoupler MAN Edgerouter LegacyLAN OLSswitches SENSORNetworks NextGenerationNetworkTopology DEMUX NC M LabelProcessing Modul
6、es 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
7、WC F WC switchcontrol TunableWavelengthConverters l router AWGR controller FixedWavelengthConverters OpticalSwitchFabricusedinCoreRouters OLSCoreandEdgeRouters IPClientNetwork OpticalLabelSwitchingNetwork CoreRouter EdgeRouter POS POS EdgeRouter CoreRouter CoreRouter PhysicalLayerInterface Encapsula
8、tion 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 Tim
9、e 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 ConventionalElectronicPacketSwitche
10、s ContentionResolution WavelengthdomainanewdimensionavailableinopticalnetworksnotinducetimingjitteroradditionallatencyTimedomainFDL usesalimitednumberofdiscretefiberdelaylinesspacedomaindeflectionroutingmulti techniquecombination Moreeffective packetarrives contention lcont res timecont res spacecon
11、t 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 Hybridcontentionresolutionforanopticalpacke
12、t 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 Je
13、on V Akella K Okamoto S Kamei Optical LabelSwitchingbasedPacketRoutingSystemwithContentionResolutionCapabilitiesinWavelength Time andSpaceDomains OFC2002 paper WO2 2002 ContentionResolutionAlgorithm AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket Reachth
14、eMaximumPayloadSize MPS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket ReachtheMaximumPayloadSize MPS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism Assemblealarger
15、opticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket ReachtheMaximumPayloadSize MPS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket ReachtheMaximumPayloadSize M
16、PS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket ReachtheMaximumPayloadSize MPS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism AssemblealargeropticalpacketfromIPpacketsbasedondestinationandQoSThecreationofanopticalpacket ReachtheMaximumPayloadSize MPS ExpirationofAssemblyTime outPeriod T OpticalPacketAssemblyMechanism client transport TrafficShapingattheEdgeRou
