ZyXEL Communications GS1920-48HPv2, Руководство пользователя

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Chapter 21 Classifier
GS1920v2 Series User’s Guide
185
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C la ssifie r
21.1 C la ssifie r O ve rvie w
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.
21.1.1 Wha t Yo u C a n Do
• Use the
C la ssifie r Sta tus
screen ( Section 21.2 on page 186 ) to view the classifiers configured on the
Switch and how many times the traffic matches the rules.
• Use the
C la ssifie r C o nfig ura tio n
screen ( Section 21.3 on page 186 ) 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.
• Use the
C la ssifie r G lo b a l Se tting
screen ( Section 21.4 on page 191 ) to configure the match order and
logging on the Switch.
21.1.2 Wha t Yo u Ne e d to Kno w
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 on a classified traffic flow (refer to Chapter 22
on page 194 to configure policy rules).