rfc3209.RSVP-TE Extensions to RSVP for LSP Tunnels

NetworkWorkingGroupD.AwducheRequestforComments:3209MovazNetworks,Inc.Category:StandardsTrackL.BergerD.GanJuniperNetworks,Inc.T.LiProcketNetworks,Inc.V.SrinivasanCosineCommunications,Inc.G.SwallowCiscoSystems,Inc.December2001RSVP-TE:ExtensionstoRSVPforLSPTunnelsStatusofthisMemoThisdocumentspecifiesanInternetstandardstrackprotocolfortheInternetcommunity,andrequestsdiscussionandsuggestionsforimprovements.PleaserefertothecurrenteditionoftheInternetOfficialProtocolStandards(STD1)forthestandardizationstateandstatusofthisprotocol.Distributionofthismemoisunlimited.CopyrightNoticeCopyright(C)TheInternetSociety(2001).AllRightsReserved.AbstractThisdocumentdescribestheuseofRSVP(ResourceReservationProtocol),includingallthenecessaryextensions,toestablishlabel-switchedpaths(LSPs)inMPLS(Multi-ProtocolLabelSwitching).SincetheflowalonganLSPiscompletelyidentifiedbythelabelappliedattheingressnodeofthepath,thesepathsmaybetreatedastunnels.AkeyapplicationofLSPtunnelsistrafficengineeringwithMPLSasspecifiedinRFC2702.WeproposeseveraladditionalobjectsthatextendRSVP,allowingtheestablishmentofexplicitlyroutedlabelswitchedpathsusingRSVPasasignalingprotocol.Theresultistheinstantiationoflabel-switchedtunnelswhichcanbeautomaticallyroutedawayfromnetworkfailures,congestion,andbottlenecks.Awduche,etal.StandardsTrack[Page1]RFC3209ExtensionstoRSVPforLSPTunnelsDecember2001Contents1Introduction..........................................31.1Background.............................................41.2Terminology............................................62Overview..............................................72.1LSPTunnelsandTrafficEngineeredTunnels.............72.2OperationofLSPTunnels...............................82.3ServiceClasses........................................102.4ReservationStyles.....................................102.4.1FixedFilter(FF)Style................................102.4.2WildcardFilter(WF)Style.............................112.4.3SharedExplicit(SE)Style.............................112.5ReroutingTrafficEngineeredTunnels...................122.6PathMTU...............................................133LSPTunnelrelatedMessageFormats.....................153.1PathMessage...........................................153.2ResvMessage...........................................164LSPTunnelrelatedObjects.............................174.1LabelObject...........................................174.1.1HandlingLabelObjectsinResvmessages................174.1.2Non-supportoftheLabelObject........................194.2LabelRequestObject...................................194.2.1LabelRequestwithoutLabelRange......................194.2.2LabelRequestwithATMLabelRange.....................204.2.3LabelRequestwithFrameRelayLabelRange.............214.2.4HandlingofLABEL_REQUEST..............................224.2.5Non-supportoftheLabelRequestObject................234.3ExplicitRouteObject..................................234.3.1Applicability..........................................244.3.2SemanticsoftheExplicitRouteObject.................244.3.3Subobjects.............................................254.3.4ProcessingoftheExplicitRouteObject................284.3.5Loops..................................................304.3.6ForwardCompatibility..................................304.3.7Non-supportoftheExplicitRouteObject...............314.4RecordRouteObject....................................314.4.1Subobjects.............................................314.4.2Applicability..........................................344.4.3ProcessingRRO.........................................354.4.4LoopDetection.........................................364.4.5ForwardCompatibility..................................374.4.6Non-supportofRRO.....................................374.5ErrorCodesforEROandRRO............................374.6Session,SenderTemplate,andFilterSpecObjects......384.6.1SessionObject.........................................394.6.2SenderTemplateObject.................................404.6.3FilterSpecificationObject............................42Awduche,etal.StandardsTrack[Page2]RFC3209ExtensionstoRSVPforLSPTunnelsDecember20014.6.4RerouteandBandwidthIncreaseProcedure...............424.7SessionAttributeObject...............................434.7.1Formatwithoutresourceaffinities.....................434.7.2Formatwithresourceaffinities........................454.7.3ProceduresapplyingtobothC-Types....................464.7.4ResourceAffinityProcedures..........................485HelloExtension........................................495.1HelloMessageFormat...................................505.2HELLOObjectformats...................................515.2.1HELLOREQUESTobject...................................515.2.2HELLOACKobject.......................................515.3HelloMessageUsage....................................525.4Multi-LinkConsiderations..............................535.5Compatibility..........................................546SecurityConsiderations.....................