Table of Contents
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JunosE 11.3.x Quality of Service Configuration Guide
Chapter 4
Chapter 5
Part 3
Chapter 6
x
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
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: Configuring WRED and Dynamic Queue Thresholds . . . . . . . . . . . . . . . 33
Monitoring RED and WRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
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
QoS Scheduler Hierarchy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Scheduler Hierarchy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Configuring a Scheduler Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Configuring a Scheduler Profile for a Scheduler Node or Queue . . . . . . . . . . . . . . 48
Copyright © 2010, Juniper Networks, Inc.
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