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Table of Contents

1 QoS Overview ············································································································································1-1

Introduction ·············································································································································1-1

Traditional Packet Forwarding Service ···································································································1-1

New Requirements from Emerging Services··························································································1-1

Congestion: Causes, Impacts, and Countermeasures ···········································································1-2

Causes ············································································································································1-2

Impacts············································································································································1-2

Countermeasures····························································································································1-2

Major Traffic Management Techniques ··································································································1-3

2 QoS Policy Configuration·························································································································2-1

Overview ·················································································································································2-1

Configuring a QoS Policy························································································································2-1

Defining a Class ······························································································································2-1

Defining a Traffic Behavior··············································································································2-4

Defining a Policy······························································································································2-5

Applying a Policy ·····························································································································2-6

Displaying and Maintaining QoS Policies ·······························································································2-8

3 Priority Mapping ········································································································································3-1

Priority Overview·····································································································································3-1

Priority Mapping Overview······················································································································3-4

Configuring a Priority Mapping Table······································································································3-6

Configuration Prerequisites·············································································································3-6

Configuration Procedure··················································································································3-6

Configuration Example ····················································································································3-7

Configuring the Port Priority····················································································································3-7

Configuration Prerequisites·············································································································3-8

Configuration Procedure··················································································································3-8

Configuration Example ····················································································································3-8

Configuring Port Priority Trust Mode·······································································································3-8

Configuration Procedure··················································································································3-9

Configuration Example ····················································································································3-9

Displaying and Maintaining Priority Mapping··························································································3-9

4 Traffic Policing, Traffic Shaping,and Line Rate Configuration·····························································4-1

Traffic Policing, Traffic Shaping, and Line Rate Overview······································································4-1

Traffic Evaluation and the Token Bucket·························································································4-1

Traffic Policing·································································································································4-2

Line Rate ·········································································································································4-3

CAR/GTS/Line Rate Configuration ·········································································································4-4

Configuring GTS······························································································································4-4

Line Rate Configuration Procedure·································································································4-5

Displaying Line Rate·······························································································································4-6