Presentation on theme: "Q5/13: Network Interworking Including, IP Multiservices Networks"— Presentation transcript:
1 Q5/13: Network Interworking Including, IP Multiservices Networks Ghassem Koleyni, Rapporteur Q5/135 November 2002
2 Our MandateConsideration of IP based backbone networks and their interworking and interaction with traditional networks and associated services.Determination of how best to carry narrow-band and broadband services in a fully integrated IP based network.Definition of protocol requirements for interworking of services that go beyond those provided by traditional networks. Typical examples might include, distance learning, e-commerce, text to voice (and vice versa), video on demand.
3 Items for studyHarmonization of interworking requirements developed in the ITU-T with those developed in other standards bodies and industry organisations.Analysis of interworking and definition of protocol requirements between the newly developed protocols and traditional networks.Analysis of interworking and definition of protocol requirements between the newly developed approaches in a heterogeneous network environment (e.g. different service providers using different technologies in their national networks and the related interaction, such as BICC interaction with SIP).
4 Items for study - continued Analysis and definition of protocol requirements for service interworking for a potential evolving set of newly defined services.Follow up on the results initiated in Draft Recommendation Y.1401 and in the I.5xx series of recommendations.
5 Q5/13 Activities Present Planned ATM – MPLS interworking FR – MPLS interworkingVoice Services over MPLSPlannedEthernet over MPLSTDM over MPLSService interworking for all X – MPLS interworkingITU-T SG13 Lead Study Group for IP related matters and on Multi-protocol and IP-based networks and their internetworkingQ5/13 mandate is to work on General Interworking including IP-based Multi-service Networks
6 Network Structure Today’s Networks Near term evolution Mid-term realization
7 Today’s Network Architectures Frame RelayNetworksPSTN/ISDNIWFIWFIWFIP/MPLSNetworksIWFIWFRadio Access NetworksIWFIWFIWFIWFWireless AccessATM NetworksEthernetNetworksMultiple, interworked, interdependent networksDiversity of control and management architecturesCapacity and performance bottlenecksEach network has its own control plane and management plane
8 PSTN/ISDN OSF & NM, M series Rec. Near Term EvolutionPSTN/ISDNSS7 NetworkQ & X series Rec.Rec. Q.931Frame Relay NetworksRec. Q.700 seriesPSTN/ISDNIWFRec. I.580Rec. Q.2931, PNNIIWFIWFFR OSF & NMRec. I.555Rec. I.580PSTN/ISDN OSF & NM, M series Rec.ATM NetworksIETF RFCsWireless accessIWFIWFIP-based NetworksRec. Y.1310ATM OSF & NM, M series Rec.SNMP basedProseConvergence on ATM core networking enables initial stage of unified management and controlEnhanced performance and QoS capabilities for multi-services over common platformConsLack of service transparency between IP based services and ATM/PSTN servicesOSF = Operating Support Function
9 Mid-Term Realization - Convergence on MPLS Core ATMNetworksFrame RelayNetworksMPLS NETWORKIWFIWFFrame RelayNetworksIWFEthernetNetworksIWFEthernetNetworksIWFIWFATM NetworksLabel Switching Router (LSR)Label Switched Path (LSP)Requires well defined interworking mechanism for all servicesTransfer plane functionsControl plane functionsManagement plane functions
10 MPLS Gateway Networking Solution implications Multiservice Access NetworksCore NetworkMultiservice Access NetworksEnd-to-end SPVC/SVCsPNNI NetworkingMPLS GatewayMPLS GatewayATMATML2/L3 VPN servicesTraditional L2 servicesL2/L3 VPN servicesTraditional L2 servicesFRCR-LDP/RSVP-TEFRL2 AccessNetworksPNNIL2 AccessNetworksPNNIIWFStacked LSPsIWFEthernetEthernetMPLS CoreIP-basedNetworksIP RoutingIP RoutingL3 VPN and other IP servicesIP-basedNetworksL3 VPN and other IP servicesExploiting label stacking capabilities of MPLS
11 Example ATM-MPLS Network Interworking ATM NetworkABLSP “tunnel”IWFIWF=Interworking FunctionLSRIn MPLS, network interworking and tunnelling concepts are used interchangeably
12 Example of Encapsulation Format Transport LabelLabel StackingInterworking LabelControl Fields and Service Specific Header (SSH)PayloadTransport labelInterworking labelControl Field & SSHPayloadMPLS Frame
13 Interworking Challenges-Sharing of LSPs MPLS Transport LSPATMFRHow to ensure QoS transparency if multiple services share same transport LSP, e.g., bandwidth sharing between ATM & FR?
14 Interworking Challenges-QoS ATMMPLS tunnel with QoS xATMExamples of service mappingMPLS tunnel with QoS yATM TransferCapabilityDiffserv ClassDBREFSBR.1SBR.2/.3AF1/AF2Mapping of ATM services to diffserve classes for preservation of QoS transparencyShould the LSPs be segregated based on QoS classes?
15 Interworking Challenges- OAM & Fault Management Y.iwY.1711LSP “tunnel”IWFIWFATM NetworkAATM NetworkBQ3, M3OSF/TMN?SNMP= Possible trouble locationHow fault and performance monitoring capabilities between ATM and MPLS networks can be related?How do the management I/F communicate (I.e., TMN (CMIP) and SNMP)?How SLA performance management is handled?
16 Interworking Challenges -Protection Switching ATM NWKATMMPLSworking pathprotection pathMPLS NetworkProtection switching by OAM or fast reroute by control plane?IETF adopting restoration based on rerouting capabilities (control plane)Local repair or end-to-end protection?Is local repair manageable?ITU-T working on protection switching model based on extensions of basic SDH (Synchronous Digital Hierarchy) approach
17 Interworking Challenges-Traffic Management I.371 & TM4.1?RSVP & DiffservIWFWell definedTMcapabilitiesLSP “tunnel”ATM NetworkAATM NetworkBIWF= CongestionRSVP providing some flexibilitiesDiffserv require substantial enhancement to LSR traffic management capabilities, i.e. CAC, policing