Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 315)

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101

CHAPTER

20-1

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Applying QoS Policies

This chapter describes how to apply QoS policies, and contains the following sections:

• Overview, page 20-1

• QoS Concepts, page 20-2

• Identifying Traffic for QoS, page 20-3

• Classifying Traffic for QoS, page 20-4

• Defining a QoS Policy Map, page 20-6

• Applying Rate Limiting, page 20-6

• Activating the Service Policy, page 20-9

• Applying Low Latency Queueing, page 20-9

• Viewing QoS Statistics, page 20-11

• Viewing the Priority-Queue Configuration for an Interface, page 20-12

Overview

Have you ever participated in a long-distance phone call that involved a satellite connection? The

conversation may be punctuated with brief, but perceptible, gaps at odd intervals. Those gaps are the

time, called the latency, between the arrival of packets being transmitted over the network. Some

network traffic, such as voice and streaming video, cannot tolerate long latency times. Quality of Service

(QoS) is a network feature that lets you give priority to these types of traffic.

As the Internet community of users upgrades their access points from modems to high-speed broadband

connections like DSL and cable, the likelihood increases that at any given time, a single user might be

able to absorb most, if not all, of the available bandwidth, thus starving the other users. To prevent any

one user or site-to-site connection from consuming more than its fair share of bandwidth, QoS provides

a policing feature that regulates the maximum bandwidth that any user can use.

QoS refers to the capability of a network to provide better service to selected network traffic over various

technologies for the best overall services with limited bandwidth of the underlying technologies.

The primary goal of QoS in the security appliance is to provide rate limiting on selected network traffic

for both individual flow or VPN tunnel flow to ensue that all traffic gets its fair share of limited

bandwidth.

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