Chapter 8. Quality of Service

This chapter covers the following key topics:

• QoS Overview

• Priority Queuing

• Custom Queuing

• Weighted Fair Queuing

• Modified Deficit Round Robin

• Weighted Random Early Detection

• Selective Packet Discard

• Other QoS Features

The growing availability of data networks has fueled tremendous momentum toward placing all traffic—voice, video, and data—onto the infrastructure that provides data service alone today. Among the obstacles network engineers face when trying to combine voice, video, and data onto one network is that different types of traffic require different levels of service from the network. For example,

• Video requires high bandwidth and a consistent transit delay. This delay doesn’t necessarily ...

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