GMPLS协议.docx

GMPLS协议.docx

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GMPLS协议

NetworkWorkingGroupE.Mannie,Ed.

RequestforComments:

3945October2004

Category:

StandardsTrack

GeneralizedMulti-ProtocolLabelSwitching（GMPLS）Architecture

StatusofthisMemo

ThisdocumentspecifiesanInternetstandardstrackprotocolforthe

Internetcommunity,andrequestsdiscussionandsuggestionsfor

improvements.Pleaserefertothecurrenteditionofthe"Internet

OfficialProtocolStandards"（STD1）forthestandardizationstate

andstatusofthisprotocol.Distributionofthismemoisunlimited.

CopyrightNotice

Copyright（C）TheInternetSociety（2004）.

Abstract

Futuredataandtransmissionnetworkswillconsistofelementssuch

asrouters,switches,DenseWavelengthDivisionMultiplexing（DWDM）

systems,Add-DropMultiplexors（ADMs）,photoniccross-connects

（PXCs）,opticalcross-connects（OXCs）,etc.thatwilluseGeneralized

Multi-ProtocolLabelSwitching（GMPLS）todynamicallyprovision

resourcesandtoprovidenetworksurvivabilityusingprotectionand

restorationtechniques.

ThisdocumentdescribesthearchitectureofGMPLS.GMPLSextends

MPLStoencompasstime-division（e.g.,SONET/SDH,PDH,G.709）,

wavelength（lambdas）,andspatialswitching（e.g.,incomingportor

fibertooutgoingportorfiber）.ThefocusofGMPLSisonthe

controlplaneofthesevariouslayerssinceeachofthemcanuse

physicallydiversedataorforwardingplanes.Theintentionisto

coverboththesignalingandtheroutingpartofthatcontrolplane.

MannieStandardsTrack[Page1]

RFC3945GMPLSArchitectureOctober2004

TableofContents

1.Introduction.........................4

1.1.Acronyms&Abbreviations................4

1.2.MultipleTypesofSwitchingandForwardingHierarchies.5

1.3.ExtensionoftheMPLSControlPlane..........7

1.4.GMPLSKeyExtensionstoMPLS-TE............10

2.RoutingandAddressingModel.................11

2.1.AddressingofPSCandnon-PSClayers..........13

2.2.GMPLSScalabilityEnhancements.............13

2.3.TEExtensionstoIPRoutingProtocols.........14

3.UnnumberedLinks.......................15

3.1.UnnumberedForwardingAdjacencies...........16

4.LinkBundling........................16

4.1.RestrictionsonBundling................17

4.2.RoutingConsiderationsforBundling..........17

4.3.SignalingConsiderations................18

4.3.1.Mechanism1:

ImplicitIndication........18

4.3.2.Mechanism2:

ExplicitIndicationbyNumbered

InterfaceID..................19

4.3.3.Mechanism3:

ExplicitIndicationbyUnnumbered

InterfaceID..................19

4.4.UnnumberedBundledLink................19

4.5.FormingBundledLinks.................20

5.RelationshipwiththeUNI..................20

5.1.RelationshipwiththeOIFUNI.............21

5.2.ReachabilityacrosstheUNI..............21

6.LinkManagement.......................22

6.1.ControlChannelandControlChannelManagement.....23

6.2.LinkPropertyCorrelation...............24

6.3.LinkConnectivityVerification.............24

6.4.FaultManagement....................25

6.5.LMPforDWDMOpticalLineSystems（OLSs）........26

7.GeneralizedSignaling....................27

7.1.Overview:

HowtoRequestanLSP............29

7.2.GeneralizedLabelRequest...............30

7.3.SONET/SDHTrafficParameters..............31

7.4.G.709TrafficParameters................32

7.5.BandwidthEncoding...................33

7.6.GeneralizedLabel...................34

7.7.WavebandSwitching...................34

7.8.LabelSuggestionbytheUpstream............35

7.9.LabelRestrictionbytheUpstream...........35

7.10.Bi-directionalLSP...................36

7.11.Bi-directionalLSPContentionResolution........37

7.12.RapidNotificationofFailure.............37

7.13.LinkProtection....................38

7.14.ExplicitRoutingandExplicitLabelControl......39

MannieStandardsTrack[Page2]

RFC3945GMPLSArchitectureOctober2004

7.15.RouteRecording....................40

7.16.LSPModificationandLSPRe-routing..........40

7.17.LSPAdministrativeStatusHandling...........41

7.18.ControlChannelSeparation...............42

8.ForwardingAdjacencies（FA）.................43

8.1.RoutingandForwardingAdjacencies...........43

8.2.SignalingAspects...................44

8.3.CascadingofForwardingAdjacencies..........44

9.RoutingandSignalingAdjacencies..............45

10.ControlPlaneFaultHandling.................46

11.LSPProtectionandRestoration................47

11.1.ProtectionEscalationacrossDomainsandLayers....48

11.2.MappingofServicestoP&RResources..........49

11.3.ClassificationofP&RMechanismCharacteristics....49

11.4.DifferentStagesinP&R................50

11.5.RecoveryStrategies..................50

11.6.Recoverymechanisms:

Protectionschemes........51

11.7.Recoverymechanisms:

Restorationschemes........52

11.8.SchemaSelectionCriteria...............53

12.NetworkManagement......................54

12.1.NetworkManagementSystems（NMS）............55

12.2.ManagementInformationBase（MIB）...........55

12.3.Tools.........................56

12.4.FaultCorrelationBetweenMultipleLayers.......56

13.SecurityConsiderations...................57

14.Acknowledgements.......................58

15.References..........................58

15.1.NormativeReferences..................58

15.2.InformativeReferences.................59

16.Contributors.........................63

17.Author'sAddress.......................68

FullCopyrightStatement...................69

MannieStandardsTrack[Page3]

RFC3945GMPLSArchitectureOctober2004

1.Introduction

Thearchitecturedescribedinthisdocumentcoversthemainbuilding

blocksneededtobuildaconsistentcontrolplaneformultiple

switchinglayers.Itdoesnotrestrictthewaythattheselayers

worktogether.Differentmodelscanbeapplied,e.g.,overlay,

augmentedorintegrated.Moreover,eachpairofcontiguouslayers

maycollaborateindifferentways,resultinginanumberofpossible

combinations,atthediscretionofmanufacturersandoperators.

Thisarchitectureclearlyseparatesthecontrolplaneandthe

forwardingplane.Inaddition,italsoclearlyseparatesthecontrol

planeintwoparts,thesignalingplanecontainingthesignaling

protocolsandtheroutingplanecontainingtheroutingprotocols.

ThisdocumentisageneralizationoftheMulti-ProtocolLabel

Switching（MPLS）architecture[RFC3031],andinsomecasesmaydiffer

slightlyfromthatarchitecturesincenonpacket-basedforwarding

planesarenowconsidered.Itisnottheintentionofthisdocument

todescribeconceptsalreadydescribedinthecurrentMPLS

architecture.Thegoalistodescribespecificconceptsof

GeneralizedMPLS（GMPLS）.

However,someoftheconceptsexplainedhereafterarenotpartofthe

currentMPLSarchitectureandareapplicabletobothMPLSandGMPLS

（i.e.,linkbundling,unnumberedlinks,andLSPhierarchy）.Since

theseconceptswereintroducedtogetherwithGMPLSandsincetheyare

ofparamountimportanceforanoperationalGMPLSnetwork,theywill

bediscussedhere.

Theorganizationoftheremainderofthisdocumentisasfollows.We

beginwithanintroductionofGMPLS.Wethenpresentthespecific

GMPLSbuildingblocksandexplainhowtheycanbecombinedtogether

tobuildanoperationalGMPLSnetwork.Specificdetailsofthe

separatebuildingblockscanbefoundinthecorrespondingdocuments.

1.1.Acronyms&Abbreviations

ASAutonomousSystem

BGPBorderGatewayProtocol

CR-LDPConstraint-basedRoutingLDP

CSPFConstraint-basedShortestPathFirst

DWDMDenseWavelengthDivisionMultiplexing

FAForwardingAdjacency

GMPLSGeneralizedMulti-ProtocolLabelSwitching

IGPInteriorGatewayProtocol

LDPLabelDistributionProtocol

LMPLinkManagementProtocol

MannieStandardsTrack[Page4]

RFC3945GMPLSArchitectureOctober2004

LSALinkStateAdvertisement

LSRLabelSwitchingRouter

LSPLabelSwitchedPath

MIBManagementInformationBase

MPLSMulti-ProtocolLabelSwitching

NMSNetworkManagementSystem

OXCOpticalCross-Connect

PXCPhotonicCross-Connect

RSVPReSourcereserVationProtocol

SDHSynchronousDigitalHierarchy

SONETSynchronousOpticalNetworks

STM（-N）SynchronousTransportModule（-N）

STS（-N）SynchronousTransportSignal-LevelN（SONET）

TDMTimeDivisionMultiplexing

TETrafficEngineering

1.2.MultipleTypesofSwitchingandForwardingHierarchies

GeneralizedMPLS（GMPLS）differsfromtraditionalMPLS