3Com 3C13636 Configuration Manual page 1288

3Com Router 3000 Ethernet Family
Configuration Guide
Chapter 1 QoS Overview .............................................................................................................. 1-1
1.1 Introduction ........................................................................................................................ 1-1
1.2 Traditional Packets Transmission Application ................................................................... 1-1
1.3 New Requirements Caused by New Applications ............................................................. 1-1
1.4 Congestion: Causes, Impact, and Countermeasures........................................................ 1-2
1.4.1 Causes .................................................................................................................... 1-2
1.4.2 Countermeasure...................................................................................................... 1-3
1.5 Traffic Control Technologies.............................................................................................. 1-3
Chapter 2 Traffic Classification, Policing, and Shaping............................................................ 2-1
2.1 Traffic Classification........................................................................................................... 2-1
2.2 Traffic Policing and Traffic Shaping ................................................................................... 2-1
2.2.1 Traffic Evaluation and Token Bucket ...................................................................... 2-2
2.2.2 Traffic Policing......................................................................................................... 2-3
2.2.3 Traffic Shaping ........................................................................................................ 2-3
2.2.4 Line Rate on Physical Port...................................................................................... 2-4
2.3 Traffic Policing and Traffic Shaping Configuration ............................................................ 2-5
2.3.1 Configuring Traffic Policing ..................................................................................... 2-5
2.3.2 Configuring Traffic Shaping..................................................................................... 2-7
2.3.3 Configuring Interface LR ......................................................................................... 2-7
2.4 Traffic Policing and Shaping Display and Debug .............................................................. 2-8
2.4.1 Displaying CAR Rule............................................................................................... 2-8
2.4.2 Displaying CAR Information on Each Interface....................................................... 2-8
2.4.3 Displaying GTS Configuration and Statistics on Interface ...................................... 2-8
2.4.4 Displaying LR Configuration and Statistics on Interface ......................................... 2-9
2.5 Traffic Policing and Shaping Configuration Example ........................................................ 2-9
2.6 MFR Interface LR Configuration Example....................................................................... 2-11
Chapter 3 Congestion Management ............................................................................................ 3-1
3.1 Brief Introduction to Congestion Management .................................................................. 3-1
3.1.1 Congestion Management Policies........................................................................... 3-1
3.1.2 Comparisons among Congestion Management Technologies ............................... 3-6
3.2 Configuring FIFO Queue ................................................................................................... 3-9
3.2.1 Configuring FIFO Queue Length............................................................................. 3-9
3.3 Priority Queuing Configuration........................................................................................... 3-9
3.3.1 Configuring Priority-list ............................................................................................ 3-9
3.3.2 Applying Priority-list Queue on the Interface......................................................... 3-11
3.3.3 Displaying and Debugging Priority Queue ............................................................ 3-12
3.4 Custom Queuing Configuration ....................................................................................... 3-12
Table of Contents
3Com Corporation
i
Table of Contents