End-to-End QoS Network Design

Chapter 1. Introduction to QoS

This chapter provides a brief history of both voice and data network evolution, illustrating the background of the concept of Quality of Service (QoS). It introduces the fundamental QoS concepts of IntServ and DiffServ to set the stage for the later discussion of individual QoS mechanisms. The following topics are introduced and briefly discussed:

• IntServ and DiffServ

• QoS tools categories

• Modular QoS CLI

• QoS Baseline

• QoS classes

• Automatic QoS

A fair amount has been written in the industry about quality of service (QoS), but it seldom is explained why QoS has become a topic of concern in modern networks when it was something relatively unheard of only a few years ago. It is instructive to review briefly a small amount of ...