ZyXEL Communications GS2200-24 Series, User Manual

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GS2200-24 User’s Guide
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H A P T E R
20
Classifier
20.1 Overview
This chapter introduces and shows you how to configure the packet classifier on
the Switch. It also discusses Quality of Service (QoS) and classifier concepts as
employed by the Switch.
20.2 What You Can Do
Use the Classifier screen ( Section 20.4 on page 170 ) to define the classifiers and
view a summary of the classifier configuration. After you define the classifier, you
can specify actions (or policy) to act upon the traffic that matches the rules.
20.3 What You Need to Know
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.