ZyXEL Communications 4728F User Manual

XGS-4526/4528F/4728F User’s Guide

This chapter introduces and shows you how to configure the packet classifier on 
the Switch.

Quality of Service (QoS) refers to both a network's ability to deliver data with 
minimum delay, and the networking methods used to control the use of 
bandwidth. Without QoS, all traffic data is equally likely to be dropped when the 
network is congested. This can cause a reduction in network performance and 
make the network inadequate for time-critical application such as video-on-
demand.

A classifier groups traffic into data flows according to specific criteria such as the 
source address, destination address, source port number, destination port number 
or incoming port number. For example, you can configure a classifier to select 
traffic from the same protocol port (such as Telnet) to form a flow.

Configure QoS on the Switch to group and prioritize application traffic and fine-
tune network performance. Setting up QoS involves two separate steps:

Configure classifiers to sort traffic into different flows. 

Configure policy rules to define actions to be performed for a classified traffic flow 
(refer to 

to configure policy rules).

Use the Classifier screen to define the classifiers. After you define the classifier, 
you can specify actions (or policy) to act upon the traffic that matches the rules. 
To configure policy rules, refer to 

.