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Development of Informative Codepoint Mapping in ITU-T Study Group 12 for Network Interconnection

This document outlines the efforts of ITU-T Study Group 12 and Question 17 to enhance interconnection between service providers through the development of Recommendation Y.1566 on "QoS mapping and interconnection between Ethernet, IP, and MPLS networks." It discusses qualitative performance characteristics and proposes classes and codepoints for network traffic management. Additionally, it examines the incentive for service providers to evolve their link marking strategies over time and provides a framework for interconnecting link class configurations.

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Development of Informative Codepoint Mapping in ITU-T Study Group 12 for Network Interconnection

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  1. Liaison to Transport Area WG:“Development of Informative Codepoint mapping in ITU-T Study Group 12” Al Morton, Rapporteur of Question 17 on Performance of packet-based networks https://datatracker.ietf.org/liaison/1165/

  2. What’s all this about?Q17’s work to improve interconnection between Service Providers now in a Recommendation • Y.1566 “QoS mapping and interconnection between Ethernet, IP and MPLS Networks” • formerly Y.QoSMap, informal name still appears in places • Describes Classes: qualitative performance char. & apps • 4 Ordinary (~every SP has them) and 4 Auxiliary (3-bit code space) • Similar to Treatment Agg. in RFC 5127 or Per-Domain Behaviors • NO normative codepoint to Class assignment inside SP • Informative mapping between classes and code-points in an Appendix – this is for tsvwg’s info and comment • Concept: Interconnecting Link between SPs • Mark to standard Link Class & 3-bit CP, Re-mark on Egress • Each SP can configure to the Link once for all interconnections • Incentive to evolve to Link markings within SP over time

  3. What Happens Next? • tsvwg decides to • Prepare a consensus response as reply • Share a set of individual comments from tsvwg-list • Consider the information shared in the Liaison • Do nothing

  4. Background – Y.1566 Interconnecting Link

  5. Information and Example Mapping

  6. 3GPP Classes & GSMA IP PHB MPLS TC IP Precedence Ethernet Priority MEF IP PHB‘s & Classes • First item 5 EF EF 5 5 High Conversational AF41 4 4 4 N/A Streaming • Interactive • High Prority • Medium Priority • Low Priority • Medium • Comitted • Excess AF31 AF31 3 3 3 AF32 AF32, AF33 AF33 • Low • Comitted • Excess Background (no subclass) AF11 Best Effort 0 0 0 0 BE 0, AF12, AF13 Standardised packet network QoS class and codepoint schemes at interconnection points. The table below is proposing classes and codepoints for interconnection interfaces and interworking between IP/MPLS and Ethernet layers. Please note that the table proposes changing GSMA PHBs (AF32 replaces AF21 and AF33 replaces AF 11). This change also solves a compatibility issue between GSMA IR.34 and MEF 23.1 on application of PHB AF1. N/A

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