Configuration Guidelines for DiffServ Service Classes

This RFC 4594 was published in 2006.

Abstract

This document describes service classes configured with Diffserv and recommends how they can be used and how to construct them using Differentiated Services Code Points (DSCPs), traffic conditioners, Per-Hop Behaviors (PHBs), and Active Queue Management (AQM) mechanisms.
There is no intrinsic requirement that particular DSCPs, traffic conditioners, PHBs, and AQM be used for a certain service class, but as a policy and for interoperability it is useful to apply them consistently.

RFC 4594 introduction

To aid in understanding the role of this document, we use an analogy: the Differentiated Services specifications are fundamentally a toolkit.
The specifications provide the equivalent of band saws, planers, drill presses, and other tools.
In the hands of an expert, there is no limit to what can be built, but such a toolkit can be intimidating to the point of being inaccessible to a non-expert who just wants to build a bookcase.
This document should be viewed as a set of "project plans" for building all the (diffserv) furniture that one might want.
The user may choose what to build (e.g., perhaps our non-expert doesn't need a china cabinet right now), and how to go about building it (e.g., plans for a non-expert probably won't employ mortise/tenon construction, but that absence does not imply that mortise/tenon construction is forbidden or unsound).
The authors hope that these diffserv "project plans" will provide a useful guide to Network Administrators in the use of diffserv techniques to implement quality-of-service measures appropriate for their network's traffic.

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