Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration manual

JunosE™ Software

for E Series™ Broadband

Services Routers

Quality of Service Configuration Guide

Release

11.3.x

Published: 2010-09-22

Juniper Networks, Inc.

1194 North Mathilda Avenue

Sunnyvale, California 94089

USA

408-745-2000

www.juniper.net

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Products made or sold by Juniper Networks or components thereof might be covered by one or more of the following patents that are

owned by or licensed to Juniper Networks: U.S. Patent Nos. 5,473,599, 5,905,725, 5,909,440, 6,192,051, 6,333,650, 6,359,479, 6,406,312,

6,429,706, 6,459,579, 6,493,347, 6,538,518, 6,538,899, 6,552,918, 6,567,902, 6,578,186, and 6,590,785.

JunosE™ Software for E Series™ Broadband Services Routers Quality of Service Configuration Guide

Release 11.3.x

Writing: Krupa Chandrashekar, Bruce Gillham, Sarah Lesway-Ball, Brian Wesley Simmons, Poornima Goswami, Chander Aima, Namrata

Mehta

Editing: Benjamin Mann

Illustration: Nathaniel Woodward

Cover Design: Edmonds Design

Revision History

October 2010—FRS JunosE 11.3.x

The information in this document is current as of the date listed in the revision history.

YEAR 2000 NOTICE

Juniper Networks hardware and software products are Year 2000 compliant. The Junos OS has no known time-related limitations through

the year 2038. However, the NTP application is known to have some difficulty in the year 2036.

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Abbreviated Table of Contents

About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii

Part 1 QoS on the E Series Router

Chapter 1 Quality of Service Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Part 2 Classifying, Queuing, and Dropping Traffic

Chapter 2 Defining Service Levels with Traffic Classes and Traffic-Class Groups . . . . 13

Chapter 3 Configuring Queue Profiles for Buffer Management . . . . . . . . . . . . . . . . . . . . 17

Chapter 4 Configuring Dropping Behavior with RED and WRED . . . . . . . . . . . . . . . . . . . 25

Chapter 5 Gathering Statistics for Rates and Events in the Queue . . . . . . . . . . . . . . . . 37

Part 3 Scheduling and Shaping Traffic

Chapter 6 QoS Scheduler Hierarchy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy . . . . . . . . . . . . . . 51

Chapter 8 Configuring Strict-Priority Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Chapter 9 Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Chapter 10 Configuring Simple Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . . . . . 75

Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm . . . . . . . . . 85

Chapter 12 Configuring Compound Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . 95

Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping . . . . 103

Chapter 14 Monitoring a QoS Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Part 4 Creating a QoS Scheduler Hierarchy on an Interface with QoS

Profiles

Chapter 15 QoS Profile Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Chapter 16 Configuring and Attaching QoS Profiles to an Interface . . . . . . . . . . . . . . . . 125

Chapter 17 Configuring Shadow Nodes for Queue Management . . . . . . . . . . . . . . . . . . 141

Chapter 18 Monitoring a Scheduler Hierarchy on an Interface with QoS Profiles . . . . 147

Part 5 Interface Solutions for QoS

Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM . . . . . . . . . . . 151

Chapter 20 Configuring QoS for Gigabit Ethernet Interfaces and VLAN

Subinterfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups . . . . . . . . . . . . . . . . 175

Chapter 22 Configuring QoS for L2TP Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Chapter 23 Configuring Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Part 6 Managing Queuing and Scheduling with QoS Parameters

Chapter 24 QoS Parameter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

Chapter 25 Configuring a QoS Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Chapter 26 Configuring Hierarchical QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Chapter 27 Configuring IP Multicast Bandwidth Adjustment with QoS Parameters . . 253

Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters . . . . . 265

Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS Parameters . . 275

Chapter 30 Configuring the Downstream Rate Using QoS Parameters . . . . . . . . . . . . 283

Part 7 Monitoring and Troubleshooting QoS

Chapter 31 Monitoring QoS on E Series Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

Chapter 32 Troubleshooting QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Part 8 Index

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

JunosE 11.3.x Quality of Service Configuration Guide

Table of Contents

About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii

E Series and JunosE Documentation and Release Notes . . . . . . . . . . . . . . . . . . xxvii

Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxvii

E Series and JunosE Text and Syntax Conventions . . . . . . . . . . . . . . . . . . . . . . . xxvii

Obtaining Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix

Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix

Requesting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxix

Self-Help Online Tools and Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxx

Opening a Case with JTAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxx

Part 1 QoS on the E Series Router

Chapter 1 Quality of Service Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

QoS on the E Series Router Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

QoS Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

QoS Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Interface Specifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

QoS Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

QoS Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Configuring QoS on the E Series Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

QoS References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Part 2 Classifying, Queuing, and Dropping Traffic

Chapter 2 Defining Service Levels with Traffic Classes and Traffic-Class Groups . . . . 13

Traffic Class and Traffic-Class Groups Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Best-Effort Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Traffic-Class Groups Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Configuring Traffic Classes That Define Service Levels . . . . . . . . . . . . . . . . . . . . . . 14

Configuring Traffic-Class Groups That Define Service Levels . . . . . . . . . . . . . . . . . 15

Monitoring Traffic Classes and Traffic-Class Groups for Defined Levels of

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Chapter 3 Configuring Queue Profiles for Buffer Management . . . . . . . . . . . . . . . . . . . . 17

Queuing and Buffer Management Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Static Oversubscription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Dynamic Oversubscription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Color-Based Thresholding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Memory Requirements for Queue and Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Guidelines for Managing Queue Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Guidelines for Configuring a Maximum Threshold . . . . . . . . . . . . . . . . . . . . . . 19

Guidelines for Configuring a Minimum Threshold . . . . . . . . . . . . . . . . . . . . . . 20

Guidelines for Managing Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Guidelines for Managing Buffer Starvation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Configuring Queue Profiles to Manage Buffers and Thresholds . . . . . . . . . . . . . . . 22

Monitoring Queues and Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Chapter 4 Configuring Dropping Behavior with RED and WRED . . . . . . . . . . . . . . . . . . . 25

Dropping Behavior Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

RED and WRED Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Configuring RED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Example: Configuring Average Queue Length for RED . . . . . . . . . . . . . . . . . . . . . . 28

Example: Configuring Dropping Thresholds for RED . . . . . . . . . . . . . . . . . . . . . . . 28

Example: Configuring Color-Blind RED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Configuring WRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Example: Configuring Different Treatment of Colored Packets for WRED . . . . . . . 32

Example: Defining Different Drop Behavior for Each Traffic Class for WRED . . . . 32

Example: Configuring WRED and Dynamic Queue Thresholds . . . . . . . . . . . . . . . 33

Monitoring RED and WRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Chapter 5 Gathering Statistics for Rates and Events in the Queue . . . . . . . . . . . . . . . . 37

QoS Statistics Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Rate Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Event Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Bulk Statistics Support for QoS Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Configuring Statistic Profiles for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Configuring Rate Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Configuring Event Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Clearing QoS Statistics on the Egress Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Clearing QoS Statistics on the Fabric Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Monitoring QoS Statistics for Rates and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Part 3 Scheduling and Shaping Traffic

Chapter 6 QoS Scheduler Hierarchy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

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

JunosE 11.3.x Quality of Service Configuration Guide

Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy . . . . . . . . . . . . . . 51

Rate Shaping and Port Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Configuring Rate Shaping for a Scheduler Node or Queue . . . . . . . . . . . . . . . . . . . 52

Configuring Port Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Static and Hierarchical Assured Rate Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Configuring an Assured Rate for a Scheduler Node or Queue . . . . . . . . . . . . . . . . 54

Configuring a Static Assured Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Configuring a Hierarchical Assured Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Changing the Assured Rate to an HRR Weight . . . . . . . . . . . . . . . . . . . . . . . . 55

Configuring the HRR Weight for a Scheduler Node or Queue . . . . . . . . . . . . . . . . 56

Chapter 8 Configuring Strict-Priority Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Strict-Priority and Relative Strict-Priority Scheduling Overview . . . . . . . . . . . . . . 57

Relative Strict-Priority Scheduling Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Comparison of True Strict Priority with Relative Strict Priority Scheduling . . . . . . 59

Schedulers and True Strict Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Schedulers and Relative Strict Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Relative Strict Priority on ATM Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Oversubscribing ATM Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Minimizing Latency on the SAR Scheduler . . . . . . . . . . . . . . . . . . . . . . . . 61

HRR Scheduler Behavior and Strict-Priority Scheduling . . . . . . . . . . . . . . . . . 61

Zero-Weight Queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Setting the Burst Size in a Shaping Rate . . . . . . . . . . . . . . . . . . . . . . . . . 62

Special Shaping Rate for Nonstrict Queues . . . . . . . . . . . . . . . . . . . . . . . 62

Configuring Strict-Priority Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Configuring Relative Strict-Priority Scheduling for Aggregate Shaping Rates . . . . 65

Chapter 9 Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Shared Shaper Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

How Shared Shaping Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Active Constituents for Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Guidelines for Configuring Simple and Compound Shared Shaping . . . . . . . . . . . 70

Shared Shaping and Individual Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Shared Shaping and Best-Effort Queues and Nodes . . . . . . . . . . . . . . . . . . . 70

ATM and Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Sharing Bandwidth with the SAR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Shared Shaping and Low-CDV Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Logical Interface Traffic Carried in Other Queues . . . . . . . . . . . . . . . . . . . . . . 72

Traffic Starvation and Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Oversubscription and Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Burst Size and Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Chapter 10 Configuring Simple Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . . . . . 75

Simple Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Bandwidth Allocation for Simple Shared Shaping . . . . . . . . . . . . . . . . . . . . . 75

Simple Shared Shaping on the Best-Effort Scheduler Node . . . . . . . . . . . . . 75

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Simple Shared Shaping for Triple-Play Networks . . . . . . . . . . . . . . . . . . . . . . 76

Configuring Simple Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Example: Simple Shared Shaping for ATM VCs . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Example: Simple Shared Shaping for ATM VPs . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Example: Simple Shared Shaping for Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm . . . . . . . . . 85

Simple Shared Shaping Algorithm Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Simple Shared Shaper Algorithm Calculations . . . . . . . . . . . . . . . . . . . . . . . . 86

Variables of the Simple Shared Shaper Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . 87

Guidelines for Controlling the Simple Shared Shaper Algorithm . . . . . . . . . . . . . 88

Configuring Simple Shared Shaper Algorithm Variables . . . . . . . . . . . . . . . . . . . . 89

Sample Process for Controlling the Simple Shared Shaper Algorithm . . . . . . . . . 90

Chapter 12 Configuring Compound Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . 95

Compound Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Supported Hardware for Compound Shared Shaping . . . . . . . . . . . . . . . . . . 95

Bandwidth Allocation for Compound Shared Shaping . . . . . . . . . . . . . . . . . . 96

Configuring Compound Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Example: Compound Shared Shaping for ATM VCs . . . . . . . . . . . . . . . . . . . . . . . . 98

Example: Compound Shared Shaping for ATM VPs . . . . . . . . . . . . . . . . . . . . . . . 100

Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping . . . . 103

Constituent Selection for Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . 103

Types of Shared Shaper Constituents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Implicit Constituent Selection Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Implicit Bandwidth Allocation for Compound Shared Shaping . . . . . . . . . . . 107

Weighted Compound Shared Shaping Example . . . . . . . . . . . . . . . . . . 109

Configuring Implicit Constituents for Simple or Compound Shared Shaping . . . 110

Explicit Constituent Selection Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Explicit Shared Shaping Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Explicit Weighted Compound Shared Shaping Example . . . . . . . . . . . . . . . . 112

Configuring Explicit Constituents for Simple or Compound Shared Shaping . . . . 115

Chapter 14 Monitoring a QoS Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Monitoring QoS Scheduling and Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Part 4 Creating a QoS Scheduler Hierarchy on an Interface with QoS

Profiles

Chapter 15 QoS Profile Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

QoS Profile Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Managing System Resources for Nodes and Queues . . . . . . . . . . . . . . . . . . . . . . . 121

Scaling Subscribers on the TFA ASIC with QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Chapter 16 Configuring and Attaching QoS Profiles to an Interface . . . . . . . . . . . . . . . . 125

Supported Interface Types for QoS Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Configuring a QoS Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Attaching a QoS Profile to an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Attaching a QoS Profile to a Base Interface . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Attaching a QoS Profile to an ATM VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

JunosE 11.3.x Quality of Service Configuration Guide

Attaching a QoS Profile to an S-VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Attaching a QoS Profile to a Port Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Munged QoS Profile Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Sample Munged QoS Profile Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Example: Port-Type QoS Profile Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Example: QoS Profile Attachment to Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Example: Diffserv Configuration with Multiple Traffic-Class Groups . . . . . . . . . . 137

Chapter 17 Configuring Shadow Nodes for Queue Management . . . . . . . . . . . . . . . . . . 141

Shadow Node Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Shadow Nodes and Scheduler Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Managing System Resources for Shadow Nodes . . . . . . . . . . . . . . . . . . . . . . . . . 143

Configuring Shadow Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Example: Shadow Nodes over VLAN and IP Queues . . . . . . . . . . . . . . . . . . . . . . 145

Example: Shadow Nodes on the Same Traffic-Class Group . . . . . . . . . . . . . . . . 146

Example: Shadow Nodes on Different Traffic-Class Groups . . . . . . . . . . . . . . . . 146

Chapter 18 Monitoring a Scheduler Hierarchy on an Interface with QoS Profiles . . . . 147

Monitoring a Scheduler Hierarchy on an Interface with QoS Profiles . . . . . . . . . . 147

Part 5 Interface Solutions for QoS

Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM . . . . . . . . . . . 151

ATM Integrated Scheduler Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Backpressure and the Integrated Scheduler . . . . . . . . . . . . . . . . . . . . . . . . . . 152

VP Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Integrating the HRR Scheduler and SAR Scheduler . . . . . . . . . . . . . . . . . . . . . . . 154

Per-Packet Queuing on the SAR Scheduler Overview . . . . . . . . . . . . . . . . . . . . . . 155

Operational QoS Shaping Mode for ATM Interfaces Overview . . . . . . . . . . . 156

ERX7xx Models, ERX14xx Models, and the ERX310 Router . . . . . . . . . . 156

E120 Router and E320 Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Guidelines for Configuring QoS over ATM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Configuring Default Integrated Mode for ATM Interface . . . . . . . . . . . . . . . . . . . . 160

Configuring Low-Latency Mode for Per-Port Queuing on ATM Interfaces . . . . . . 161

Configuring Low-CDV Mode for Per-Port Queuing on ATM Interfaces . . . . . . . . . 163

Configuring the QoS Shaping Mode for ATM Interfaces . . . . . . . . . . . . . . . . . . . . 166

Disabling Per-Port Queuing on ATM Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Monitoring QoS Configurations for ATM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Chapter 20 Configuring QoS for Gigabit Ethernet Interfaces and VLAN

Subinterfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Providing QoS for Ethernet Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

QoS Shaping Mode for Ethernet Interfaces Overview . . . . . . . . . . . . . . . . . . . . . . 170

Configuring the QoS Shaping Mode for Ethernet Interfaces . . . . . . . . . . . . . . . . . 171

Creating a QoS Interface Hierarchy for Bulk-Configured VLAN Subinterfaces

with RADIUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Monitoring QoS Configurations for Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Table of Contents

Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups . . . . . . . . . . . . . . . . 175

QoS for 802.3ad Link Aggregation Interfaces Overview . . . . . . . . . . . . . . . . . . . . 175

Types of Load Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Munged QoS Profiles and Load Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

802.3ad Link Aggregation and QoS Parameters . . . . . . . . . . . . . . . . . . . . . . 176

QoS and Ethernet Link Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Active Link Failure and QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Administratively Disabling a Link and QoS . . . . . . . . . . . . . . . . . . . . . . . . 177

Adding a New Link to the LAG and QoS . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Hashed Load Balancing for 802.3ad Link Aggregation Groups Overview . . . . . . . 177

Sample Scheduler Hierarchy for Hashed Load Balancing . . . . . . . . . . . . . . . 178

Subscriber Load Balancing for 802.3ad Link Aggregation Groups Overview . . . . 178

S-VLANs and Subscriber Load Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

PPPoE over VLANs and Subscriber Load Balancing . . . . . . . . . . . . . . . . . . . 179

PPPoE over Ethernet (No VLANs) and Subscriber Load Balancing . . . . . . . 179

MPLS over LAG and Subscriber Load Balancing . . . . . . . . . . . . . . . . . . . . . . 179

Sample Scheduler Hierarchy for Subscriber Load Balancing . . . . . . . . . . . . . 179

Subscriber Allocation in 802.3ad Link Aggregation Groups . . . . . . . . . . . . . 180

Guidelines for Configuring QoS over 802.3ad Link Aggregation Groups . . . . . . . . 181

Configuring the Scheduler Hierarchy for Hashed Load Balancing in 802.3ad Link

Aggregation Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Enabling Default Subscriber Load Balancing for 802.3ad Link Aggregation

Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Configuring the Scheduler Hierarchy for Subscriber Load Balancing in 802.3ad

Link Aggregation Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Configuring Load Rebalancing for 802.3ad Link Aggregation Groups . . . . . . . . . 184

Configuring Load–Rebalancing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . 184

Configuring the System to Dynamically Rebalance the LAG . . . . . . . . . . . . . 185

Monitoring QoS Configurations for 802.3ad Link Aggregation Groups . . . . . . . . 186

Chapter 22 Configuring QoS for L2TP Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Providing QoS for L2TP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Sample Scheduler Hierarchies for L2TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Configuring QoS for an L2TP Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189

Configuring QoS for an L2TP LNS Session . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Configuring QoS for an L2TP LAC Session . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Configuring QoS for Tunnel-Server Ports for L2TP LNS Sessions . . . . . . . . . . . . 192

QoS and L2TP TX Speed AVP 24 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

Logical Interfaces and Shared-Shaping Rates . . . . . . . . . . . . . . . . . . . . . . . . 193

Shaping Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Monitoring QoS Configurations for L2TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Chapter 23 Configuring Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Interface Sets for QoS Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Interface Set Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Architecture of Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Interface Set Parents and Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Sample Interface Columns and Scheduler Hierarchies . . . . . . . . . . . . . . . . . 197

JunosE 11.3.x Quality of Service Configuration Guide

Scheduling and Shaping Interface Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Configuring Interface Sets for Scheduling and Queuing . . . . . . . . . . . . . . . . . . . . 199

Configuring Interface Supersets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Configuring an Interface Superset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Restricting an Interface Superset to an S-VLAN ID or an ATM VP . . . . . . . . 200

Configuring Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Configuring an Interface Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Deleting an Interface Set from an Interface Superset . . . . . . . . . . . . . . . . . . 201

Adding Member Interfaces to an Interface Set . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Adding Interfaces to an Interface Set with the CLI . . . . . . . . . . . . . . . . . . . . 202

Adding Interfaces to an Interface Set with RADIUS . . . . . . . . . . . . . . . . . . . 202

Changing and Deleting Interface Members in an Interface Set . . . . . . . . . . 203

Changing Interface Members with Upper-Layer Protocols in an Interface

Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Creating a QoS Parameter on an Interface Superset or Interface Set . . . . . . . . . 204

Configuring a QoS Parameter Definition for an Interface Superset or an

Interface Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204

Creating a QoS Parameter Instance for an Interface Superset . . . . . . . . . . . 204

Creating a QoS Parameter Instance for an Interface Set . . . . . . . . . . . . . . . 205

Attaching a QoS Profile to an Interface Superset or an Interface Set . . . . . . . . . 205

Configuring a QoS Profile for an Interface Superset or an Interface Set . . . 205

Attaching a QoS Profile to an Interface Superset . . . . . . . . . . . . . . . . . . . . . 206

Attaching a QoS Profile to an Interface Set . . . . . . . . . . . . . . . . . . . . . . . . . . 206

Deleting an Interface Superset or an Interface Set . . . . . . . . . . . . . . . . . . . . . . . . 207

Deleting an Interface Superset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Deleting an Interface Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Example: Configuring Interface Sets for 802.3ad Link Aggregation Groups . . . . 208

Part 6 Managing Queuing and Scheduling with QoS Parameters

Chapter 24 QoS Parameter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

QoS Parameter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

QoS Parameter Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

QoS Parameter Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

Relationship Among QoS Parameters, Scheduler Profiles, and QoS Profiles . . . 213

QoS Administrator Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

QoS Client Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

Chapter 25 Configuring a QoS Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Parameter Definition Attributes for QoS Administrators Overview . . . . . . . . . . . 215

Naming Guidelines for QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Interface Types and QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Controlled-Interface Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Instance-Interface Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

Subscriber-Interface Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Range of QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Table of Contents

Applications and QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Scheduler Profiles and Parameter Expressions for QoS Administrators . . . . . . . 221

Referencing a Parameter Definition in a Scheduler Profile . . . . . . . . . . . . . . . 221

Removing or Modifying a Scheduler Profile . . . . . . . . . . . . . . . . . . . . . . . 221

Using Expressions for QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Operators and Precedence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Specifying a Range in Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Configuring a Basic Parameter Definition for QoS Administrators . . . . . . . . . . . . 223

Parameter Instances for QoS Clients Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Global QoS Parameter Instance Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 226

QoS Parameters for Interfaces Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

Creating Parameter Instances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Creating a Global Parameter Instance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Creating a Parameter Instance for an Interface . . . . . . . . . . . . . . . . . . . . . . . 227

Creating a Parameter Instance for an ATM VP . . . . . . . . . . . . . . . . . . . . . . . . 227

Creating a Parameter Instance for an S-VLAN . . . . . . . . . . . . . . . . . . . . . . . 228

Example: QoS Parameter Configuration for Controlling Subscriber

Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

Procedure for QoS Administrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230

Procedure for QoS Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Monitoring the Subscriber Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237

Complete Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

QoS Administrator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

QoS Client Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

Chapter 26 Configuring Hierarchical QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Hierarchical QoS Parameters Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Guidelines for Configuring Hierarchical Parameters . . . . . . . . . . . . . . . . . . . . . . . 245

Configuring a Parameter Definition to Calculate Hierarchical Instances . . . . . . . 246

Example: QoS Parameter Configuration for Hierarchical Parameters . . . . . . . . . 247

Procedure for QoS Administrators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

Procedure for QoS Clients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Monitoring Hierarchical QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

Complete Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

QoS Administrator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

QoS Client Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

Chapter 27 Configuring IP Multicast Bandwidth Adjustment with QoS Parameters . . 253

IP Multicast Bandwidth Adjustment for QoS Overview . . . . . . . . . . . . . . . . . . . . 253

Guidelines for Configuring IP Multicast Adjustment for QoS . . . . . . . . . . . . . . . . 255

Configuring a Parameter Definition for IP Multicast Bandwidth Adjustment . . . 255

Example: QoS Parameter Configuration for IP Multicast Bandwidth

Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257

Monitoring the Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Complete Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters . . . . . 265

Cell Shaping Mode Using QoS Parameters Overview . . . . . . . . . . . . . . . . . . . . . 265

Overriding the QoS Shaping Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

Module Types and Capabilities for QoS Cell Mode Application . . . . . . . . . . 266

JunosE 11.3.x Quality of Service Configuration Guide

Cell Tax Adjustment Using QoS Cell Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Relationship with QoS Downstream Rate Application . . . . . . . . . . . . . . . . . 267

Guidelines for Configuring the Cell Shaping Mode with QoS Parameters . . . . . . 267

Configuring a Parameter Definition to Shape Ethernet Traffic Using Cell

Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

Example: QoS Parameter Configuration for QoS Cell Mode and Byte Adjustment

for Cell Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Complete Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

Chapter 29 Configuring Byte Adjustment for Shaping Rates with QoS Parameters . . 275

Byte Adjustment for ADSL and VDSL Traffic Overview . . . . . . . . . . . . . . . . . . . . 275

Byte Adjustment for Cell Shaping of ADSL Traffic Overview . . . . . . . . . . . . 275

Calculation and Example of Byte Adjustment for Cell Shaping . . . . . . . 276

Byte Adjustment for Frame Shaping of VDSL Traffic Overview . . . . . . . . . . 277

System Calculation for Byte Adjustment of ADSL and VDSL Traffic . . . . . . . 277

Guidelines for Configuring Byte Adjustment of Cell and Frame Shaping Rates

Using QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Configuring a Parameter Definition to Adjust Cell Shaping Rates for ADSL

Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Configuring a Parameter Definition to Adjust Frame Shaping Rates for VDSL

Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Chapter 30 Configuring the Downstream Rate Using QoS Parameters . . . . . . . . . . . . 283

QoS Downstream Rate Application Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Downstream Rate and the Shaping Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

QoS Adaptive Mode and Downstream Rate . . . . . . . . . . . . . . . . . . . . . . . . . 284

Obtaining Downstream Rates from a DSL Forum VSA . . . . . . . . . . . . . . . . . 284

Guidelines for Configuring QoS Downstream Rate . . . . . . . . . . . . . . . . . . . . . . . 285

Configuring a Parameter Definition for QoS Downstream Rate . . . . . . . . . . . . . . 285

Example: QoS Parameter Configuration for QoS Downstream Rate . . . . . . . . . . 287

Complete Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Part 7 Monitoring and Troubleshooting QoS

Chapter 31 Monitoring QoS on E Series Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295

Monitoring Service Levels with Traffic Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

Monitoring Service Levels with Traffic-Class Groups . . . . . . . . . . . . . . . . . . . . . . 297

Monitoring Queue Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298

Monitoring Queue Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301

Monitoring Drop Profiles for RED and WRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302

Monitoring the QoS Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

Monitoring the Configuration of Scheduler Profiles . . . . . . . . . . . . . . . . . . . . . . . 309

Monitoring Shared Shapers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310

Monitoring Shared Shaper Algorithm Variables . . . . . . . . . . . . . . . . . . . . . . . . . . 312

Monitoring Forwarding and Drop Events on the Egress Queue . . . . . . . . . . . . . . . 313

Monitoring Forwarding and Drop Rates on the Egress Queue . . . . . . . . . . . . . . . 314

Monitoring Queue Statistics for the Fabric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318

Monitoring the Configuration of Statistics Profiles . . . . . . . . . . . . . . . . . . . . . . . . 319

Monitoring the QoS Profiles Attached to an Interface . . . . . . . . . . . . . . . . . . . . . 320

Monitoring the Configuration of QoS Port-Type Profiles . . . . . . . . . . . . . . . . . . . . 321

Table of Contents

Monitoring the Configuration of QoS Profiles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321

Monitoring the QoS Configuration of ATM Interfaces . . . . . . . . . . . . . . . . . . . . . . 324

Monitoring the QoS Configuration of IP Interfaces . . . . . . . . . . . . . . . . . . . . . . . . 326

Monitoring the QoS Configuration of Fast Ethernet, Gigabit Ethernet, and

10-Gigabit Ethernet Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328

Monitoring the QoS Configuration of IEEE 802.3ad Link Aggregation Group

Bundles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329

Monitoring the Configuration of QoS Interface Sets . . . . . . . . . . . . . . . . . . . . . . 330

Monitoring the Configuration of QoS Interface Supersets . . . . . . . . . . . . . . . . . . 331

Monitoring the AAA Downstream Rate for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Monitoring QoS Parameter Instances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

Monitoring QoS Parameter Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

Chapter 32 Troubleshooting QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics

and Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

Part 8 Index

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

JunosE 11.3.x Quality of Service Configuration Guide

List of Figures

Part 1 QoS on the E Series Router

Chapter 1 Quality of Service Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 1: Traffic Flow Through an E Series Router . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Part 2 Classifying, Queuing, and Dropping Traffic

Chapter 4 Configuring Dropping Behavior with RED and WRED . . . . . . . . . . . . . . . . . . . 25

Figure 2: Packets Dropped as Queue Length Increases . . . . . . . . . . . . . . . . . . . . . 26

Figure 3: Color-Blind RED Drop Profile with Colorless Queue Profile . . . . . . . . . . . 29

Figure 4: Color-Blind RED Drop Profile with Color-Sensitive Queue Profile . . . . . 30

Figure 5: Different Treatment of Colored Packets . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 6: Defining Different Drop Behavior for Each Queue . . . . . . . . . . . . . . . . . . 33

Figure 7: WRED and Dynamic Queue Thresholding . . . . . . . . . . . . . . . . . . . . . . . . 35

Part 3 Scheduling and Shaping Traffic

Chapter 6 QoS Scheduler Hierarchy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 8: QoS Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy . . . . . . . . . . . . . . 51

Figure 9: Port Shaping on an Ethernet Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Figure 10: Hierarchical Assured Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Chapter 8 Configuring Strict-Priority Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Figure 11: Sample Strict-Priority Scheduling Hierarchy . . . . . . . . . . . . . . . . . . . . . . 58

Figure 12: True Strict-Priority Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Figure 13: Relative Strict-Priority Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 14: Tuning Latency on Strict-Priority Queues . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 15: Sample Strict-Priority Scheduling Hierarchy . . . . . . . . . . . . . . . . . . . . . 64

Figure 16: Sample Relative Strict-Priority Scheduler Hierarchy . . . . . . . . . . . . . . . 66

Chapter 9 Shared Shaping Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Figure 17: Implicit Constituent Selection for Compound Shared Shaper: Mixed

Interface Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Chapter 10 Configuring Simple Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . . . . . 75

Figure 18: Simple Shared Shaping over ATM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Figure 19: Simple Shared Shaping over Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 20: VP Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 21: Hierarchical Simple Shared Shaping over Ethernet . . . . . . . . . . . . . . . . 82

Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm . . . . . . . . . 85

Figure 22: Simple Shared Shaper Behavior Without Algorithm Controls . . . . . . . 85

Figure 23: Less Conservative Simple Shared Shaper Behavior . . . . . . . . . . . . . . . 86

Figure 24: More Liberal Simple Shared Shaper Behavior . . . . . . . . . . . . . . . . . . . . 86

Figure 25: Dynamic Rate When Video Flow Starts . . . . . . . . . . . . . . . . . . . . . . . . . 92

Figure 26: Dynamic Rate When Video Flow Stops . . . . . . . . . . . . . . . . . . . . . . . . . 93

Chapter 12 Configuring Compound Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . 95

Figure 27: VC Compound Shared Shaping Example . . . . . . . . . . . . . . . . . . . . . . . 98

Figure 28: VP Compound Shared Shaping Example . . . . . . . . . . . . . . . . . . . . . . 100

Chapter 13 Configuring Implicit and Explicit Constituent Selection for Shaping . . . . 103

Figure 29: Implicit Constituent Selection for Compound Shared Shaper at

Best-Effort Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Figure 30: Implicit Constituent Selection for Compound Shared Shaper at

Best-Effort Queue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Figure 31: Weighted Shared Shaping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Figure 32: Implicit Constituent Selection for Compound Shared Shaper: Mixed

Interface Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Figure 33: Explicit Constituent Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Figure 34: Case 1: Explicit Constituent Selection with Weighted Constituents . . . 113

Figure 35: Case 2: Explicit Constituent Selection with Weighted Constituents . . 114

Part 4 Creating a QoS Scheduler Hierarchy on an Interface with QoS

Profiles

Chapter 16 Configuring and Attaching QoS Profiles to an Interface . . . . . . . . . . . . . . . . 125

Figure 36: Munged Profile Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Figure 37: Attaching QoS Profiles to ATM Subinterfaces . . . . . . . . . . . . . . . . . . . . 133

Figure 38: Attaching QoS Profile to ATM Interface and Subinterface . . . . . . . . . . 135

Figure 39: Diffserv Configuration with Multiple Traffic-Class Groups . . . . . . . . . . 139

Figure 40: Diffserv Configuration Without Traffic-Class Groups . . . . . . . . . . . . . 140

Chapter 17 Configuring Shadow Nodes for Queue Management . . . . . . . . . . . . . . . . . . 141

Figure 41: Phantom Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Figure 42: Shadow Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Part 5 Interface Solutions for QoS

Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM . . . . . . . . . . . 151

Figure 43: Integrated ATM Scheduler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Figure 44: Default Integrated Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Figure 45: Low-Latency Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Figure 46: Low-CDV Mode (per-VP CDVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Figure 47: Low-CDV Mode (per-VC CDVT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups . . . . . . . . . . . . . . . . 175

Figure 48: 802.3ad Link Aggregation Scheduler Hierarchy . . . . . . . . . . . . . . . . . . 178

Figure 49: Subscriber LoadBalanced Scheduler Hierarchy for Port 0 . . . . . . . . . 180

Figure 50: Subscriber LoadBalanced Scheduler Hierarchy for Port 1 . . . . . . . . . . 180

Figure 51: Subscriber Allocation and Load Balancing . . . . . . . . . . . . . . . . . . . . . . . 181

Chapter 22 Configuring QoS for L2TP Sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

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