PTN关键技术 城域网发展策略

6,008,000,00城域网的发展策略PHOSPHORGUANGZHOUPHOSPHORINFORMATIONTECHNOLOYCO.,LTD广州元迪信息技术有限公司6,008,000,00城域网的发展策略PHOSPHORGUANGZHOUPHOSPHORINFORMATIONTECHNOLOYCO.,LTD广州元迪信息技术有限公司33PHOSPHOR3分组传送的关键技术–TMPLS344PHOSPHOR4TransportMPLS(T-MPLS)电信级的分组组网能力较高的市场接受度MPLS新的ITU-T标准继承了数据平面的优点，为分组传送实现进一步的成本优化T-MPLS与IP绑定允许非面向连接的组网OAM低于传送标准要求数据和控制平面不分离BUT非传送友好技术T-MPLS=MPLS–IP+OAM客户-服务的独立结构严格面向连接传送级的OAM和生存性NMS或GMPLS控制平面为分组传送优化55PHOSPHOR5T-MPLS保留了MPLS的许多特性:同样的帧格式(MPLSheader),转发机制(e.g.labelswappingandstacking),客户层的映射方式与3层IP无关的数据平面(只有交换，没有路由)-面向L2的技术加入了许多传送网功能:双向电路的概念严格的面向连接客户-服务层相独立传送级的的OAM和生存性NMS或ASON/GMPLS控制平面T-MPLS技术T-MPLS=MPLS–IP+OAM(+ASON/GMPLS)PWE3MPLStunnelanyL2(e.g.Ethernet)L3(IP)T-MPLStunnel全业务交换传送光传送网络IP/MPLSPathChannelEth66PHOSPHOR6T-MPLS的组网演进WDMSDHSAN,PDHATM,EthernetL0L1ClientMapatEdgeMap&SwitchTodayPhotonicSwitchingTMPLSSAN,PDH,ATM,Ethernet,IP/MPLS,SDHMapatEdgeVision•PacketTransport(L1)•SDHasaClientPhotonicSwitchingSAN,PDH,ATM,Ethernet,IP/MPLS,FRMapatEdgeSDHTMPLSTomorrow•PacketTransport(L1.5)•PushL2totheedges77PHOSPHOR7T-MPLS标准SpecificfunctionalitiesNNIandUNIspecificationsG.8112NNIArchitectureapprovedRecconsentedRecRecinprogressRecstartedReconotplannedyetRecunderrevisionG.8110.1T-MPLSG.8110MPLSG.8131linearprotManagementG.8152infomodelG.8151EMFG.8114OAMMechanismsG.8121equipmentam1am1am1G.8012NNI/UNIG.8010EthernetG.8021equipmentG.8031linearprotG.8052infomodelG.8051EMFQ.840.1NMS-EMSI/FY.1731OAMam1am1rev1am1am1G.8132ringprotG.7712DCNam1G.7710EMFG.8113OAMReq.88PHOSPHOR8基于T-MPLS的分组传送网络网络业务层多点到多点适配点到点适配逻辑传送(1:1业务，e.gVC12)传送层逻辑传送(N:1业务，e.g.VC4)可选传送层L0-L1网络T-MPLSchannelT-MPLSpathSONET/SDH,OTH/ROADM可扩展的分组网络技术实现传送的成本优化T-MPLS传送优化平台传送管理完整的工具集与IP无关传送OAM链路及环网保护恢复GMPLS/ASON或NMS客户业务层物理层以太网SONET/SDH,OTH任意L1,L2,L3业务端到端OAM和保护汇聚层OAM和保护L1(CES)AnyL2VPLSPWE3业务适配工具采用MPLS定义PWE3为点到点服务(L1(CES),任意L2)VPLS为多点到多点服务(以太网ONLY)99PHOSPHOR9Customer/Clientservicelayer(ETH,ATMVPorVC,PDHPq,ETHVS,VPorVC,FR,T-MPLSVS,VPorVC,MPLS(IP),…)T-MPLSPathlayerT-MPLSChannellayerT-MPLSSectionlayer(optional)TransmissionMediaPhysicalMedia(802.3)CircuitSwitchingTechnology(OTN,SDH,PDH)PhysicalMedia(OTM-n,STM-N,DSn/En,xDSL)GFPT-MPLSTransportModule(TTM-n)ETHChannellayermp2mp&rmpp2p&p2mpT-MPLS层网络协议栈T-MPLSlayernetworks1010PHOSPHOR10EncapsClientSignalTMC/CLTMCTMPTMSPHYPHY/TMSTTM-nsignalPHYPHY/TMPTTM-nsignalPHYTTM-nsignalTMSPHYPHY/TMSTTM-nsignalEHC/ETHEHCTMS/TMC+EHCTMS/TMPTMP/TMC+EHCPHY/TMC+EHCT-MPLS层网络帧结构C-SAC-DAMSDUSFDPAFCSSADATYPECW(opt)TTLN-SAN-DATYPESQoSLabelTTLSQoSLabelSFDPAFCSSADATYPECW(opt)TTLSQoSLabelTTLSQoSLabelmp2mp&rmpp2p&p2mpSADATYPEETHOAMPDUTMPLSOAMPDUTMPLSOAMPDUTMPLSOAMPDUTMPLSOAMPDUTMPLSOAMPDUGCHGPHFCSFCSFCSFCSFCSFCSGCHGPH802.3GFPinOTNSDHPDH802.3GFPinOTNSDHPDH1111PHOSPHOR11T-MPLS帧结构Channel/PWLabel(T-)MPLSClientLayerPayload+EncapsulationheadersPath/TunnelLabelLabelEXPSTTLLayer1/2Headers(Eth,GFP/SDH)4octetsT-MPLS的“高阶电路”标识T-MPLS的“低阶电路”标识，实现对业务的区分EncapsulationPWDemultiplexerPSNTunnelPSN&PhysicalPWE3ProtocolStackReferenceModelOuterLabelInnerLabelEmulatedService1212PHOSPHOR12EthernetPWEthernetPWallowstocarryEthernet/802.3framesoverMPLSPSNRFC4448definesencapsulationofEthernet/802.3frameswithinaPWProvidesanemulatedpoint-to-pointEthernetserviceoverMPLSnetworkbridgedPortservice(“EthernetPW”)bridgedVLANservice(“EthernetVLANPW”)NativeServiceProcessingspecifictoEthernettechnology:MACfiltering,strip/add/translateVLANtag,shaping,policing,CRCtermination/regeneration,PauseflowcontrolmechanismOptional,outsidescopeofPWE3EthernetPWsprovidethebuildingblocksforEthernetLayer2VPNsoverPSNVPWSVPLS-seeMPLS/VPLSTutorial1313PHOSPHOR13EthernetPWE3EncapsulationFrameFormats6646-150044217MACframe(64-1522)PHYdependentPreambleSFDMACDAMACSAVLANTag(opt)Length/TypeMACPayloadFCSFCSRetentionoptionforpayloadintegritytransparencyCW(opt)TunnelLabel*PWLabel(T-)MPLSPayload4441414PHOSPHOR14TDMPayloadEncapsulation/MappingOptions(1/3)SAToPorStructure-AgnosticSAToP(Structure-agnostictransportoverpacket)SupportscircuitemulationofunstructuredPDHsignal(Pqx)Ifthereisastructure,itisignoredPqTerminationfunctionofNSPblocknotusedinthiscaseSimplyencapsulatesNconsecutivebytesintoaPSNpacketComplieswithIETFRFC4553,ITU-TY.1413,MEF8,MFA8.0.0Warning:SAToPisambiguouslyusedintheindustrytorefertothepayloadmappingoptionoveranyPSN(MPLS,Ethernet,etc)andtheIETFRFC4553(whichisstrictlyspeakingonlyforIP/MPLSPSN)1515PHOSPHOR15TDMPayloadEncapsulation/MappingOptions(2/3)CESoPSNorStructure-AwareCESoPSN(CircuitEmulationServicesoverPacket-SwitchedNetwork)Supportscircuitemulationofnx64kbit/schannelsstructuredPDHsignal(Pqs)TerminationofPqsoverhead(separatePqs/P0S_AfunctionfromPqs/P0N_A)Multipleoptions:Basic/ExtendedN*64kbit/s,CCA/CCSsignalingEncapsulatesNxDS0channels,flexible64kbit/schannelselection(non-contiguous):1-32channelsperpacketwithidlechannelsuppressionSavesPSNbandwidthwhentransportingfractionalE1/T1sincenon-activetimeslotsarenottransportedandprovidedynamictimeslotallocationAggregatingfractionalE1/T1resultsinlessTDMportrequiredontheaggregatorsideSupportDS0-levelgrooming/TSIanddistributedcross-connect