This two-day course provides students with advanced class-of-service (CoS) knowledge and configuration examples. The course begins with an overview of CoS before going into classification, policing, scheduling, and rewriting. The course then covers class-based forwarding and finishes with a case study. Through demonstrations and hands-on labs, students will gain experience in configuring and verifying Junos CoS features. This course is based on the Junos operating system Release 21.1R1.

• Understand the history and evolution of CoS.
• Identify the CoS fields in various packet headers.
• List the CoS processing stages on devices running the Junos OS.
• Identify the default CoS settings on devices running the Junos OS.
• Configure and verify behavior aggregate (BA) and multifield (MF) classification.
• Configure and verify two-color and tricolor marking policers.
• Configure and verify schedulers and their components.
• Configure and verify the multiple levels of hierarchical schedulers.
• Configure and verify packet header rewriting.
• Configure and verify class-based forwarding.
• Create a CoS configuration based on a set of design requirements.

DAY 1

1. Course Introduction

2. CoS Overview

• CoS History and Evolution
• CoS and DiffServ
• CoS Fields in Packet Headers
• CoS Processing

3. Packet Classification

• Classification Overview
• Forwarding Classes and Packet Loss Priority
• Fixed Classification
• Multifield Classification
• Behavior Aggregate Classification

Lab 1: Configuring Packet Classification

4. Policing

• Policing Overview
• Single-Rate Two-Color Policer
• Tricolor Marking Policers
• Hierarchical Policers
• Application—Directly on an Interface
• Application—Within a Firewall Filter

Lab 2: Configuring Policers

5. Scheduling

• Scheduling Overview
• Transmission Rate
• Queue Priority
• Delay Buffers
• Drop Profiles and Drop Profile Maps
• Scheduling Configuration

Lab 3: Configuring Schedulers

DAY 2

6. Hierarchical Scheduling

• Hierarchical Scheduling Overview
• Scheduler Modes
• Hierarchical Scheduling Levels
• Throughput Example
• Remaining Traffic
• Queue Properties in a Hierarchical SchedulingContext
• Putting It All Together

Lab 4—Configuring Hierarchical Scheduling

7. Rewrite Rules

• Packet Header Rewrite Overview
• Rewrite Rules and Tables
• Rewrite Combinations

Lab 5: Configuring Rewrite Rules

8. CoS-Based Forwarding

• CBF Overview
• CBF Configuration

Lab 6: Configuring CBF

9. Case Study

• VoIP Case Study Overview
• VoIP Case Study: Ingress Node
• VoIP Case Study: Transit and Egress Nodes

This course is intended for network administrators who configure and administer class-of-service features on MX routers running the Junos OS.

• A strong base of networking fundamentals
• Experience and familiarity with the Junos OS
• Familiarity with the Junos command-line interface (CLI)
• Completion of the Introduction to the Junos Operating System (IJOS) course
• Completion of the Junos Intermediate Routing (JIR) course