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Controlled Load Service QoS Model Overview

This document discusses the goals, features, and updates concerning the Controlled Load Service Quality of Service Model within the NSIS protocol suite. It presents an overview, draft updates, open issues, and next steps, highlighting the simplicity and usefulness of the CLS QoSM in NSIS deployment scenarios, especially in access networks.

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Controlled Load Service QoS Model Overview

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  1. Controlled Load Service QoS Modeldraft-kappler-nsis-controlledload-qosm-03.txt Cornelia Kappler, Xiaoming Fu (Robert Hancock presenting) IETF#65 – Dallas March 2006

  2. Overview • Goals • Controlled load service QoSM • Draft Updates • Open Issues • Next steps

  3. Goals • NSIS base protocol suite is in final stages • Controlled-load service: a light-weight per-flow reservation model • Much simpler than guaranteed service • A useful example for NSIS deployment especially in access networks • CLS QoSM is about: • How to interpret QoS parameters in conjunction with NSIS QoS signaling in a way which replicates RSVP/IntServ behaviour

  4. CLS QoS Model • Token bucket parameters • QSPEC control information • MTU not included • As per Interim meeting consensus – but see later • Traffic control rules • Scheduling • Excess treatment

  5. Draft Updates After discussions at Paris meeting: • Update with detailed QOSM parameter mappings with RFC2211 • Updated Appendix: gives more detailed QOSM for both • sender-initiated reservations, and • RSVP-fashion receiver-initiated reservations

  6. Half-Open Issues • Three options for constructing QoS-NSLP-QUERY messages like RSVP-PATH messages: • Token bucket (QNE-readonly) + available bandwidth (QNE-RW) should probably be used • How exactly to interoperate with RSVP/IntServ • Basically, service translation is not a problem, but the interworking with RSVP/IntServ may need further study • The flexibility of QoS NSLP on reservation initiator can bring IntServ potentially more supporting scenarios • Some design freedom (e.g. on sender-initiated case)

  7. Next Steps • Still some protocol fine-tuning • Update following QoS-NSLP finalisation • Verify scope • Is this refining the definition of CLS? Or just providing new freedom for how to invoke it? • Start considering CL-ECN extensions? • Should it be accepted as a WG item?

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