Juniper JUNOSE 11.1.X - QUALITY OF SERVICE CONFIGURATION GUIDE 3-21-2010 Configuration Manual page 10

JUNOSe 11.1.x Quality of Service Configuration Guide
Chapter 3
Chapter 4
Chapter 5
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Table of Contents
Configuring Queue Profiles for Buffer Management
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
Configuring Dropping Behavior with RED and WRED
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 .....................................29
Example: Configuring Color-Blind RED ..........................................................29
Configuring WRED ........................................................................................31
Example: Configuring Different Treatment of Colored Packets for WRED .....33
Example: Defining Different Drop Behavior for Each Traffic Class for
WRED .....................................................................................................33
Example: Configuring WRED and Dynamic Queue Thresholds .....................34
Monitoring RED and WRED ..........................................................................36
Gathering Statistics for Rates and Events in the Queue
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
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