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Product guide

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8
Quality of Service (QoS): Managing
Bandwidth More Effectively
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3
Prioritizing and Monitoring QoS, ACL, and Rate Limiting
QoS Resource Usage and Monitoring on
Managing QoS Resource Consumption on the
Troubleshooting a Shortage of Per-Port Rule Resources on the
Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
Classifiers for Prioritizing Outbound Packets . . . . . . . . . . . . . . . . . . . 8-10
5300xl and 4200vl Packet Classifiers and Evaluation Order . . . 8-10
3400cl/6400cl Packet Classifiers and Evaluation Order . . . . . . . 8-11
Preparation for Configuring QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-14
Steps for Configuring QoS on the Switch . . . . . . . . . . . . . . . . . . . 8-14
Planning QoS for the Series 3400cl/6400cl Switches . . . . . . . . . . . . . 8-16
Feature Usage on the 3400cl/6400cl Switches . . . . . . . . . . . . . . . 8-16
3400cl/6400cl Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17
3400cl/6400cl Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18
3400cl/6400cl Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19
Examples of QoS Resource Usage on 3400cl/6400cl Switches . 8-20
Using QoS Classifiers To Configure
Quality of Service for Outbound Traffic . . . . . . . . . . . . . . . . . . . . . . . 8-23
Viewing the QoS Configuration
Assigning an 802.1p Priority Based on TCP or
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-23
No Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-24
QoS UDP/TCP Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-25
UDP Port Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-26
Assigning a DSCP Policy Based on TCP or UDP Port Number . 8-27
QoS IP-Device Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-31
8-1