ZyXEL ES-3148 Guida Utente

ES-3148 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:

1 Configure classifiers to sort traffic into different flows. 
2 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 

Click Advanced Application > Classifier in the navigation panel to display the configuration 
screen as shown.