ZyXEL Communications GS-2750, User Manual

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GS-2750 User’s Guide
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H A P T E R
18
Classifier
This chapter introduces and shows you how to configure the packet classifier on the Switch.
18.1 About the Classifier and QoS
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
Chapter 19 on page 151 to configure policy rules).
18.2 Configuring the Classifier
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
Chapter 19 on page 151 .
Click Advanced Application > Classifier in the navigation panel to display the configuration
screen as shown.