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Q5/13: Network Interworking Including, IP Multiservices Networks

Q5/13: Network Interworking Including, IP Multiservices Networks. Ghassem Koleyni, Rapporteur Q5/13 5 November 2002. Our Mandate. Consideration of IP based backbone networks and their interworking and interaction with traditional networks and associated services.

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Q5/13: Network Interworking Including, IP Multiservices Networks

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  1. Q5/13: Network Interworking Including, IP Multiservices Networks Ghassem Koleyni, Rapporteur Q5/13 5 November 2002

  2. Our Mandate • Consideration 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 study • Harmonization 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 • ATM – MPLS interworking • FR – MPLS interworking • Voice Services over MPLS • Planned • Ethernet over MPLS • TDM over MPLS • Service interworking for all X – MPLS interworking • ITU-T SG13 Lead Study Group for IP related matters and on Multi-protocol and IP-based networks and their internetworking • Q5/13 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. PSTN/ISDN Frame Relay Networks IWF IWF IWF IWF IWF IWF IWF IWF IWF Wireless Access ATM Networks Today’s Network Architectures IP/MPLS Networks Radio Access Networks Ethernet Networks • Multiple, interworked, interdependent networks • Diversity of control and management architectures • Capacity and performance bottlenecks • Each network has its own control plane and management plane

  8. PSTN/ISDN PSTN/ISDN Wireless access IWF IWF IWF IWF IWF Near Term Evolution SS7 Network Q & X series Rec. Rec. Q.931 Frame Relay Networks Rec. Q.700 series Rec. I.580 Rec. Q.2931, PNNI FR OSF & NM Rec. I.555 Rec. I.580 PSTN/ISDN OSF & NM, M series Rec. IETF RFCs ATM Networks IP-based Networks Rec. Y.1310 ATM OSF & NM, M series Rec. SNMP based • Prose • Convergence on ATM core networking enables initial stage of unified management and control • Enhanced performance and QoS capabilities for multi-services over common platform • Cons • Lack of service transparency between IP based services and ATM/PSTN services OSF = Operating Support Function

  9. IWF IWF IWF IWF IWF IWF Mid-Term Realization - Convergence on MPLS Core ATM Networks Frame Relay Networks MPLS NETWORK Frame Relay Networks Ethernet Networks Ethernet Networks ATM Networks Label Switching Router (LSR) Label Switched Path (LSP) • Requires well defined interworking mechanism for all services • Transfer plane functions • Control plane functions • Management plane functions

  10. End-to-end SPVC/SVCs PNNI Networking • L2/L3 VPN services • Traditional L2 services • L2/L3 VPN services • Traditional L2 services IWF IWF Stacked LSPs MPLS Gateway Networking Solution implications Multiservice Access Networks Core Network Multiservice Access Networks MPLS Gateway MPLS Gateway ATM ATM FR CR-LDP/RSVP-TE FR L2 Access Networks L2 Access Networks PNNI PNNI Ethernet Ethernet MPLS Core IP-based Networks IP Routing IP Routing • L3 VPN and other IP services • L3 VPN and other IP services IP-based Networks Exploiting label stacking capabilities of MPLS

  11. LSP “tunnel” IWF ATM Network A IWF ATM Network B IWF=Interworking Function Example ATM-MPLS Network Interworking LSR In MPLS, network interworking and tunnelling concepts are used interchangeably

  12. Example of Encapsulation Format Transport Label Label Stacking Interworking Label Control Fields and Service Specific Header (SSH) Payload Control Field & SSH Transport label Interworking label Payload MPLS Frame

  13. ATM MPLS Transport LSP ATM MPLS Transport LSP FR FR Interworking Challenges-Sharing of LSPs How to ensure QoS transparency if multiple services share same transport LSP, e.g., bandwidth sharing between ATM & FR?

  14. DBR Diffserv Class ATM Transfer Capability EF SBR.1 EF AF1/AF2 SBR.2/.3 Interworking Challenges-QoS ATM MPLS tunnelwith QoS x ATM Examples of service mapping MPLS tunnelwith QoS y • Mapping of ATM services to diffserve classes for preservation of QoS transparency • Should the LSPs be segregated based on QoS classes?

  15. LSP “tunnel” Interworking Challenges- OAM & Fault Management I.610 Y.iw Y.1711 IWF IWF ATM Network A ATM Network B Q3, M3 ? OSF/TMN SNMP = Possible trouble location • How 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. ATM MPLS Network MPLS working path ATM NWK ATM working path ATM protection path MPLS protection path Interworking Challenges -Protection Switching • Protection 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. LSP “tunnel” Interworking Challenges-Traffic Management I.371 & TM4.1 ? RSVP & Diffserv IWF Well defined TM capabilities ATM Network A ATM Network B IWF = Congestion • RSVP providing some flexibilities • Diffserv require substantial enhancement to LSR traffic management capabilities, i.e. CAC, policing

  18. Thank you for you attention

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