Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual page 11

Part 3
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Scheduling and Shaping Traffic
QoS Scheduler Hierarchy Overview
Scheduler Hierarchy Overview ......................................................................45
Shaping Rates, Assured Rates, and Relative Weights in a Scheduler
Hierarchy .........................................................................................46
Configuring a Scheduler Hierarchy ................................................................47
Configuring a Scheduler Profile for a Scheduler Node or Queue ....................48
Using Expressions for Bandwidth and Burst Values in a Scheduler Profile .....48
Configuring Rates and Weights in the Scheduler Hierarchy
Rate Shaping and Port Shaping Overview .....................................................51
Configuring Rate Shaping for a Scheduler Node or Queue .............................52
Configuring Port Shaping ..............................................................................53
Static and Hierarchical Assured Rate Overview .............................................54
Configuring an Assured Rate for a Scheduler Node or Queue ........................55
Configuring a Static Assured Rate ...........................................................55
Configuring a Hierarchical Assured Rate .................................................56
Changing the Assured Rate to an HRR Weight ........................................56
Configuring the HRR Weight for a Scheduler Node or Queue ........................57
Configuring Strict-Priority Scheduling
Strict-Priority and Relative Strict-Priority Scheduling Overview .....................59
Relative Strict-Priority Scheduling Overview ...........................................60
Comparison of True Strict Priority with Relative Strict Priority
Scheduling ..............................................................................................61
Schedulers and True Strict Priority ..........................................................61
Schedulers and Relative Strict Priority ....................................................62
Relative Strict Priority on ATM Modules ..................................................63
Oversubscribing ATM Ports ..............................................................64
Minimizing Latency on the SAR Scheduler .......................................64
HRR Scheduler Behavior and Strict-Priority Scheduling ...........................64
Zero-Weight Queues .........................................................................64
Setting the Burst Size in a Shaping Rate ...........................................65
Special Shaping Rate for Nonstrict Queues .......................................65
Configuring Strict-Priority Scheduling ............................................................66
Configuring Relative Strict-Priority Scheduling for Aggregate Shaping
Rates .......................................................................................................68
Shared Shaping Overview
Shared Shaping Overview .............................................................................71
Shared Shaper Terms ....................................................................................72
How Shared Shaping Works ..........................................................................72
Active Constituents for Shared Shaping ..................................................73
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Table of Contents