Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE... User manual

JunosE™ Software
for E Series™ Broadband
Services Routers
Quality of Service Configuration Guide
Release
11.3.x
Published: 2010-09-22
Copyright © 2010, Juniper Networks, Inc.

Juniper Networks, Inc.
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www.juniper.net
Juniper Networks, Junos, Steel-Belted Radius, NetScreen, and ScreenOS are registered trademarks of Juniper Networks, Inc. in the United
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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
Copyright © 2010, Juniper Networks, Inc.
All rights reserved. Printed in USA.
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.
Copyright © 2010, Juniper Networks, Inc.ii

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Copyright © 2010, Juniper Networks, Inc.vi

Abbreviated Table of Contents
AbouttheDocumentation........................................xxvii
Part 1 QoS on the E Series Router
Chapter1 QualityofServiceOverview.........................................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
Chapter9 SharedShapingOverview..........................................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
Chapter15 QoSProfileOverview..............................................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
viiCopyright © 2010, Juniper Networks, Inc.

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
Chapter24 QoSParameterOverview..........................................211
Chapter25 ConfiguringaQoSParameter......................................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
Chapter32 TroubleshootingQoS.............................................337
Part 8 Index
Index ...........................................................341
Copyright © 2010, Juniper Networks, Inc.viii
JunosE 11.3.x Quality of Service Configuration Guide

Table of Contents
AbouttheDocumentation........................................xxvii
E Series and JunosE Documentation and Release Notes . . . . . . . . . . . . . . . . . . xxvii
Audience ........................................................xxvii
E Series and JunosE Text and Syntax Conventions . . . . . . . . . . . . . . . . . . . . . . . xxvii
ObtainingDocumentation...........................................xxix
DocumentationFeedback...........................................xxix
RequestingTechnicalSupport........................................xxix
Self-Help Online Tools and Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxx
OpeningaCasewithJTAC........................................xxx
Part 1 QoS on the E Series Router
Chapter1 QualityofServiceOverview.........................................3
QoSontheESeriesRouterOverview....................................3
QoSAudience.......................................................4
QoSPlatformConsiderations..........................................4
InterfaceSpecifiers...............................................5
QoSTerms.........................................................5
QoS Features .......................................................7
ConfiguringQoSontheESeriesRouter..................................9
QoSReferences.....................................................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-EffortForwarding...........................................13
Traffic-ClassGroupsOverview.....................................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
StaticOversubscription...........................................18
DynamicOversubscription........................................18
ixCopyright © 2010, Juniper Networks, Inc.

Color-BasedThresholding.........................................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
GuidelinesforManagingBuffers.......................................20
Guidelines for Managing Buffer Starvation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Configuring Queue Profiles to Manage Buffers and Thresholds . . . . . . . . . . . . . . . 22
MonitoringQueuesandBuffers........................................24
Chapter 4 Configuring Dropping Behavior with RED and WRED . . . . . . . . . . . . . . . . . . . 25
DroppingBehaviorOverview..........................................25
REDandWREDOverview............................................26
ConfiguringRED....................................................27
Example: Configuring Average Queue Length for RED . . . . . . . . . . . . . . . . . . . . . . 28
Example: Configuring Dropping Thresholds for RED . . . . . . . . . . . . . . . . . . . . . . . 28
Example: Configuring Color-Blind RED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
ConfiguringWRED..................................................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
MonitoringREDandWRED...........................................35
Chapter 5 Gathering Statistics for Rates and Events in the Queue . . . . . . . . . . . . . . . . 37
QoSStatisticsOverview..............................................37
RateStatistics..................................................38
EventStatistics.................................................38
Bulk Statistics Support for QoS Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Configuring Statistic Profiles for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
ConfiguringRateStatistics...........................................39
ConfiguringEventStatistics..........................................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
SchedulerHierarchyOverview.........................................45
Shaping Rates, Assured Rates, and Relative Weights in a Scheduler
Hierarchy ..................................................46
ConfiguringaSchedulerHierarchy.....................................47
Configuring a Scheduler Profile for a Scheduler Node or Queue . . . . . . . . . . . . . . 48
Using Expressions for Bandwidth and Burst Values in a Scheduler Profile . . . . . . 48
Copyright © 2010, Juniper Networks, Inc.x
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
ConfiguringPortShaping.............................................52
Static and Hierarchical Assured Rate Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Configuring an Assured Rate for a Scheduler Node or Queue . . . . . . . . . . . . . . . . 54
ConfiguringaStaticAssuredRate..................................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
SchedulersandTrueStrictPriority..................................59
Schedulers and Relative Strict Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Relative Strict Priority on ATM Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
OversubscribingATMPorts....................................61
Minimizing Latency on the SAR Scheduler . . . . . . . . . . . . . . . . . . . . . . . . 61
HRR Scheduler Behavior and Strict-Priority Scheduling . . . . . . . . . . . . . . . . . 61
Zero-WeightQueues.........................................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
Chapter9 SharedShapingOverview..........................................67
SharedShapingOverview............................................67
SharedShaperTerms...............................................68
HowSharedShapingWorks..........................................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
ATMandSharedShaping.........................................71
SharingBandwidthwiththeSAR................................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
BurstSizeandSharedShaping....................................73
Chapter 10 Configuring Simple Shared Shaping of Traffic . . . . . . . . . . . . . . . . . . . . . . . . 75
SimpleSharedShapingOverview......................................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
ConfiguringSimpleSharedShaping....................................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
CompoundSharedShapingOverview..................................95
Supported Hardware for Compound Shared Shaping . . . . . . . . . . . . . . . . . . 95
Bandwidth Allocation for Compound Shared Shaping . . . . . . . . . . . . . . . . . . 96
ConfiguringCompoundSharedShaping................................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
ExplicitSharedShapingExample..................................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
Chapter15 QoSProfileOverview..............................................121
QoSProfileOverview................................................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
ConfiguringaQoSProfile............................................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
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Attaching a QoS Profile to an S-VLAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Attaching a QoS Profile to a Port Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
MungedQoSProfileOverview........................................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
ShadowNodeOverview.............................................141
Shadow Nodes and Scheduler Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
Managing System Resources for Shadow Nodes . . . . . . . . . . . . . . . . . . . . . . . . . 143
ConfiguringShadowNodes..........................................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
ATMIntegratedSchedulerOverview....................................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
E120RouterandE320Router.................................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
withRADIUS...................................................172
Monitoring QoS Configurations for Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
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Chapter 21 Configuring QoS for 802.3ad Link Aggregation Groups . . . . . . . . . . . . . . . . 175
QoS for 802.3ad Link Aggregation Interfaces Overview . . . . . . . . . . . . . . . . . . . . 175
TypesofLoadBalancing.........................................175
Munged QoS Profiles and Load Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
802.3ad Link Aggregation and QoS Parameters . . . . . . . . . . . . . . . . . . . . . . 176
QoSandEthernetLinkRedundancy................................177
ActiveLinkFailureandQoS...................................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
AggregationGroups.............................................182
Enabling Default Subscriber Load Balancing for 802.3ad Link Aggregation
Groups .......................................................183
Configuring the Scheduler Hierarchy for Subscriber Load Balancing in 802.3ad
LinkAggregationGroups.........................................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
ProvidingQoSforL2TPOverview.....................................187
Sample Scheduler Hierarchies for L2TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
ConfiguringQoSforanL2TPSession..................................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
ShapingMode.................................................194
Monitoring QoS Configurations for L2TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Chapter 23 Configuring Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
InterfaceSetsforQoSOverview......................................195
InterfaceSetTerms.............................................195
Architecture of Interface Sets for QoS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
InterfaceSetParentsandTypes...................................197
Sample Interface Columns and Scheduler Hierarchies . . . . . . . . . . . . . . . . . 197
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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
ConfiguringInterfaceSetsforQoS....................................201
ConfiguringanInterfaceSet......................................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
DeletinganInterfaceSuperset....................................207
DeletinganInterfaceSet........................................207
Example: Configuring Interface Sets for 802.3ad Link Aggregation Groups . . . . 208
Part 6 Managing Queuing and Scheduling with QoS Parameters
Chapter24 QoSParameterOverview..........................................211
QoSParameterOverview............................................211
QoSParameterAudience............................................211
QoSParameterTerms..............................................212
Relationship Among QoS Parameters, Scheduler Profiles, and QoS Profiles . . . 213
QoSAdministratorTasks.........................................213
QoSClientTasks...............................................214
Chapter25 ConfiguringaQoSParameter......................................215
Parameter Definition Attributes for QoS Administrators Overview . . . . . . . . . . . 215
Naming Guidelines for QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Interface Types and QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Controlled-InterfaceTypes....................................217
Instance-InterfaceTypes.....................................218
Subscriber-InterfaceTypes...................................219
RangeofQoSParameters........................................219
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ApplicationsandQoSParameters.................................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
OperatorsandPrecedence...................................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
CreatingParameterInstances........................................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
ProcedureforQoSAdministrators.................................230
ProcedureforQoSClients.......................................235
Monitoring the Subscriber Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
CompleteConfigurationExample..................................241
QoS Administrator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
QoSClientConfiguration.....................................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
ProcedureforQoSAdministrators.................................247
ProcedureforQoSClients.......................................249
Monitoring Hierarchical QoS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
CompleteConfigurationExample.................................250
QoS Administrator Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
QoSClientConfiguration.....................................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
MonitoringtheConfiguration.....................................260
CompleteConfigurationExample.................................262
Chapter 28 Configuring the Shaping Mode for Ethernet with QoS Parameters . . . . . 265
Cell Shaping Mode Using QoS Parameters Overview . . . . . . . . . . . . . . . . . . . . . 265
OverridingtheQoSShapingMode................................265
Module Types and Capabilities for QoS Cell Mode Application . . . . . . . . . . 266
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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
forCellShaping...............................................269
CompleteConfigurationExample..................................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
UsingQoSParameters..........................................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
CompleteConfigurationExample..................................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
MonitoringQueueThresholds........................................298
MonitoringQueueProfiles...........................................301
Monitoring Drop Profiles for RED and WRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Monitoring the QoS Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Monitoring the Configuration of Scheduler Profiles . . . . . . . . . . . . . . . . . . . . . . . 309
MonitoringSharedShapers..........................................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
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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-GigabitEthernetInterfaces....................................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
Chapter32 TroubleshootingQoS.............................................337
Troubleshooting Memory and Processor Use for Egress Queue Rate Statistics
andEvents....................................................337
Part 8 Index
Index ............................................................341
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List of Figures
Part 1 QoS on the E Series Router
Chapter1 QualityofServiceOverview.........................................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
Figure8:QoSSchedulerHierarchy.....................................46
Chapter 7 Configuring Rates and Weights in the Scheduler Hierarchy . . . . . . . . . . . . . . 51
Figure 9: Port Shaping on an Ethernet Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure10:HierarchicalAssuredRate....................................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
Chapter9 SharedShapingOverview..........................................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
Figure20:VPSharedShaping.........................................81
Figure 21: Hierarchical Simple Shared Shaping over Ethernet . . . . . . . . . . . . . . . . 82
Chapter 11 Configuring Variables in the Simple Shared Shaping Algorithm . . . . . . . . . 85
xixCopyright © 2010, Juniper Networks, Inc.

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-EffortNode...............................................106
Figure 30: Implicit Constituent Selection for Compound Shared Shaper at
Best-EffortQueue..............................................107
Figure31:WeightedSharedShaping...................................109
Figure 32: Implicit Constituent Selection for Compound Shared Shaper: Mixed
InterfaceTypes.................................................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
Figure36:MungedProfileExample.....................................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
Figure41:PhantomNodes...........................................142
Figure42:ShadowNodes............................................143
Part 5 Interface Solutions for QoS
Chapter 19 Configuring an Integrated Scheduler to Provide QoS for ATM . . . . . . . . . . . 151
Figure43:IntegratedATMScheduler...................................153
Figure44:DefaultIntegratedMode....................................160
Figure45:Low-LatencyMode........................................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
Copyright © 2010, Juniper Networks, Inc.xx
JunosE 11.3.x Quality of Service Configuration Guide