RFC 3086 (rfc3086) - Page 2 of 24

Definition of Differentiated Services Per Domain Behaviors and Rules for their Specification

RFC 3086             Diffserv per Domain Behaviors            April 2001


   PHB configuration play in its resulting attributes, it is where the
   forwarding path and the control plane interact.  The measurable
   parameters of a PDB should be suitable for use in Service Level
   Specifications at the network edge.

   This document defines and discusses Per-Domain Behaviors in detail
   and lays out the format and required content for contributions to the
   Diffserv WG on PDBs and the procedure that will be applied for
   individual PDB specifications to advance as WG products.  This format
   is specified to expedite working group review of PDB submissions.

Table of Contents

    1. Introduction ................................................ 2
    2. Definitions ................................................. 4
    3. The Value of Defining Edge-to-Edge Behavior ................. 5
    4. Understanding PDBs .......................................... 7
    5. Format for Specification of Diffserv Per-Domain Behaviors ...13
    6. On PDB Attributes ...........................................16
    7. A Reference Per-Domain Behavior .............................19
    8. Guidelines for Advancing PDB Specifications .................21
    9. Security Considerations .....................................22
   10. Acknowledgements ............................................22
       References ..................................................22
       Authors' Addresses ..........................................23
       Full Copyright Statement ....................................24

1 Introduction

   Differentiated Services allows an approach to IP Quality of Service
   that is modular, incrementally deployable, and scalable while
   introducing minimal per-node complexity [RFC 2475].  From the end
   user's point of view, QoS should be supported end-to-end between any
   pair of hosts.  However, this goal is not immediately attainable.  It
   will require interdomain QoS support, and many untaken steps remain
   on the road to achieving this.  One essential step, the evolution of
   the business models for interdomain QoS, will necessarily develop
   outside of the IETF.  A goal of the diffserv WG is to provide the
   firm technical foundation that allows these business models to
   develop.  The first major step will be to support edge-to-edge or
   intradomain QoS between the ingress and egress of a single network,
   i.e., a DS Domain in the terminology of RFC 2474.  The intention is
   that this edge-to-edge QoS should be composable, in a purely
   technical sense, to a quantifiable QoS across a DS Region composed of
   multiple DS domains.






Nichols & Carpenter          Informational