Table of Contents

About This Guide

J Series and SRX Series Documentation and Release Notes
Objectives
Audience
Supported Routing Platforms
Document Conventions
Documentation Feedback
Requesting Technical Support

Configuring Class of Service

Class of Service Overview

Benefits of CoS

CoS Across the Network

Junos OS CoS Components

Code-Point Aliases

Classifiers

Behavior Aggregate Classifiers

Default IP Precedence Classifier

Multifield Classifiers

Forwarding Classes

Loss Priorities

Forwarding Policy Options

Transmission Queues

Transmit Rate
Delay Buffer Size
Scheduling Priority
Shaping Rate
RED Drop Profiles
Default Drop Profiles

Virtual Channels

Policers for Traffic Classes

Rewrite Rules

How CoS Components Work

CoS Process on Incoming Packets
CoS Process on Outgoing Packets

Default CoS Settings

Default CoS Values and Aliases

Forwarding Class Queue Assignments

Scheduler Settings

Default Behavior Aggregate Classifiers

Defining BA Classifiers
Applying a BA Classifier to a Logical Interface

CoS Value Rewrites

Sample Behavior Aggregate Classification

Transmission Scheduling

CoS Queuing for Tunnels

Benefits of CoS Queuing on Tunnel Interfaces
How CoS Queuing Works
Limitations on CoS Shapers for Tunnel Interfaces

Configuring Class of Service

Before You Begin

Configuring CoS (J-Web Procedure)

Defining CoS Value Aliases
Defining Forwarding Classes
Defining Classifiers
Defining Rewrite Rules
Defining Schedulers
Defining Scheduler Maps
Defining Drop Profiles
Defining Virtual Channel Groups
Assigning CoS Components to Interfaces

Configuring CoS Components with a Configuration Editor

Configuring a Policer for a Firewall Filter

Configuring and Applying a Firewall Filter for a Multifield Classifier

Assigning Forwarding Classes to Output Queues

Configuring Forwarding Classes
Assigning a Forwarding Class to an Interface

Example: Configuring Up to Eight Forwarding Classes

Configuring and Applying Rewrite Rules

Configuring and Applying Behavior Aggregate Classifiers

Example: Defining Aliases for Bits

Configuring RED Drop Profiles for Congestion Control

Example: Configuring RED Drop Profiles

Configuring Schedulers

Configuring and Applying Scheduler Maps

Scheduler Maps: Sample Configuration

Schedulers: Sample Configuration

Configuring and Applying Virtual Channels

Configuring and Applying an Adaptive Shaper

Configuring Virtual Channels

Configuring CoS Virtual Channels
Creating a List of Virtual Channel Names
Defining a Virtual Channel Group
Applying a Virtual Channel Group to a Logical Interface
Selecting Traffic to Be Transmitted from a Particular Virtual Channel
Example: Configuring Virtual Channels

Configuring Adaptive Shaping for Frame Relay

Configuring an Adaptive Shaper
Applying an Adaptive Shaper to a Logical Interface

Classifying Frame Relay Traffic

Assigning the Default Frame Relay Loss Priority Map to an Interface

Defining a Custom Frame Relay Loss Priority Map

Applying the Map to a Logical Interface

Verifying Your Configuration

Rewriting Frame Relay Headers

Assigning the Default Frame Relay Rewrite Rule to an Interface

Defining a Custom Frame Relay Rewrite Rule

Applying the Rule to a Logical Interface

Configuring Strict-High Priority

Example: Configuring Strict High Priority Using the CLI
Example: Configuring Priority Scheduling

Configuring CoS for Tunnels

Configuring CoS Queuing for Tunnels with a Configuration Editor
Preserving the ToS Value of a Tunneled Packet
Example: Configuring CoS for GRE/IPIP tunnels
Restrictions on CoS Shapers

Configuring Strict High Priority for Queuing with a Configuration Editor

Configuring Large Delay Buffers with a Configuration Editor

Maximum Delay Buffer Sizes Available to Channelized T1/E1 Interfaces
Delay Buffer Size Allocation Methods
Specifying Delay Buffer Sizes for Queues
Configuring a Large Delay Buffer on a non-Channelized Ti Interface
Configuring a Large Delay Buffer on a Channelized T1 Interface

Applying an Ingress Interface Policer

Configuring Simple Filters and Policers

Configuring a Simple Filter

Applying a Simple Filter

Configuring Policers

Example: Applying a Two-Rate Tricolor Marking Policer to a Firewall Filter

Configuring CoS Hierarchical Schedulers

Hierarchical Scheduler Terminology

SRX3400 and SRX3600 Device Hardware Capabilities and Limitations

Configuring an Interface Set

Applying an Interface Set

Interface Set Caveats

Introduction to Hierarchical Schedulers

Scheduler Hierarchy Example

Interface Sets for the Hierarchical Example
Interfaces for the Hierarchical Example
Traffic Control Profiles for the Hierarchical Example
Schedulers for the Hierarchical Example
Drop Profiles for the Hierarchical Example
Scheduler Maps for the Hierarchical Example
Applying Traffic Control Profiles for the Hierarchical Example

Controlling Remaining Traffic

Internal Scheduler Nodes

PIR-only and CIR Mode

Priority Propagation

IOC Hardware Properties

WRED on the IOC

MDRR on the IOC

Configuring Excess Bandwidth Sharing

Excess Bandwidth Sharing and Minimum Logical Interface Shaping
Selecting Excess Bandwidth Sharing Proportional Rates
Mapping Calculated Weights to Hardware Weights
Allocating Weight with Only Shaping Rates or Unshaped Logical Interfaces
Sharing Bandwidth Among Logical Interfaces

Verifying a CoS Configuration

Verifying Multicast Session Announcements
Verifying a Virtual Channel Configuration
Verifying a Virtual Channel Group Configuration
Verifying an Adaptive Shaper Configuration
Displaying CoS Tunnel Configurations
Verifying a CoS GRE Tunnel Queuing Configuration
Verifying a CoS IP-IP Tunnel Configuration

Configuring Class of Service for IPv6 Traffic

Overview of Class-of-Service Functions for IPv6 Traffic
Configuring and Applying a DSCP IPv6 BA Classifier
Configuring DSCP IPv6 Rewrite Rules

Index