Linear protection switching for T-MPLS layer network (G8131 ).ppt

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1、LinearprotectionswitchingforT-MPLSlayernetwork(G.8131)ITU-TSG15Q9G.8131Summary:ThisRecommendationprovides:requirementsandmechanismsforend-to-endtrailandSNCprotectionswitchingforTransportMPLS(T-MPLS)networks.ItdescribesthetrailprotectionandSNCprotectionarchitecturestypes,theuni-andbi-directions

2、witchingtypesandtherevertive/non-revertiveoperationtypes.ItdefinestheAutomaticProtectionSwitching(APS)protocolusedtoalignbothendsoftheprotecteddomain.G.8131ArchitectureProtectionswitchingisafullyallocatedprotectionmechanismthatcanbeusedonanytopology.(reservedforaselectedworkingconnection.prote

3、ctionconnectionmustbeknowntohavecompletephysicaldiversityoverallcommon-failuremodes.)TheT-MPLSlinearProtectionswitchingarchitecturecanbetrailprotectionandSNC/SprotectionasdefinedinG.808.1.OthertypesareforfurtherstudyinG.8131.G.8131Switchingtypesuni-directionalswitchingbi-directionalswitchingOp

4、erationtypesNon-revertiveoperationRevertiveoperationG.8131Unidirectional1+1trailprotectionswitchingG.8131Bidirectional1:1trailprotectionswitchingG.8131Unidirectional1＋1SNC/SprotectionswitchingG.8131Bidirectional1:1SNC/SprotectionswitchingAPSprotocolAPS-specificinformationistransmittedwithinspe

5、cificfieldsintheAPSPDU.4octetsintheAPSPDUareusedtocarryAPS-specificinformation.TheformatoftheAPS-specificinformationisdefinedasfollows.G.8131FieldValueDescriptionPriorityRequest/State1111LockoutofProtection(LO)highest1110SignalFailforProtection(SF-P)1101ForcedSwitch(FS)

6、1011SignalFailforWorki

7、ng(SF)

8、1001SignalDegrade(SD)–Note1

9、0111ManualSwitch(MS)

10、0101WaittoRestore(WTR)

11、0100Exercise(EXER)–Note2

12、0010ReverseRequest(RR)–Note3

13、0001DoNotRevert(DNR)0000NoRequest(NR)lowestOthersReservedforfutureinternationalstandardizationProtectionTypeA0NoAPSChannel1APSChannelB01+1(PermanentBridge)11:1(

14、SelectorBridge)D0Unidirectionalswitching1BidirectionalswitchingR0Non-revertiveoperation1RevertiveoperationRequestedSignal0NullSignal1NormalTrafficSignal2-255ReservedforfutureuseBridgedSignal0NullSignal1NormalTrafficSignal2-255Reservedfo