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JCOS – Junos Class of Service

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Upcoming Courses

Jan 28 - Jan 29, 2021
09:00 - 17:00 (CEST)
Online

Apr 26 - Apr 27, 2021
09:00 - 17:00 (CEST)
Online

Aug 4 - Aug 5, 2021
09:00 - 17:00 (CEST)
Online

Oct 27 - Oct 28, 2021
09:00 - 17:00 (CEST)
Online

JCOS – Junos Class of Service
2 days  (Instructor Led Online)  |  Service Provider

Course Details

The JCOS – Junos Class of Service is a two-day course that provides students with advanced class-of-service (CoS) knowledge. 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. This course is based on the Junos operating system Release 12.3R3.4. Through demonstrations and hands-on labs, students will gain experience in configuring and verifying Junos CoS features.

 

Course Level: Junos Class of Service is an advanced level course.

 

See other Juniper courses

Objectives

After successfully completing this course, you should be able to:

  • 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 the behaviour aggregate (BA) and multifield (MF) classification.
  • Configure and verify two-colour and tricolour 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.

Outline

Day 1

Chapter 1: Course Introduction
Chapter 2: CoS Overview

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

Chapter 3: Packet Classification

  • Classification Overview
  • Forwarding Classes and Packet Loss Priority
  • Fixed Classification
  • Multifield Classification
  • Behaviour Aggregate Classification
  • Lab 1: Configuring Packet Classification

Chapter 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

Chapter 5: Scheduling

  • Scheduling Overview
  • Transmission Rate
  • Queue Priority
  • Delay Buffers
  • Drop Profiles and Drop Profile Maps
  • Scheduling Configuration
  • Lab 3: Configuring Schedulers

 

Day 2

Chapter 6: Hierarchical Scheduling

  • Hierarchical Scheduling Overview
  • Scheduler Modes
  • Hierarchical Scheduling Levels
  • Throughput Example
  • Remaining Traffic
  • Queue Properties in a Hierarchical Scheduling Context
  • Putting It All Together
  • Lab 4: Configuring Hierarchical Schedulers

Chapter 7: Rewrite Rules

  • Packet Header Rewrite Overview
  • Rewrite Rules and Tables
  • Rewrite Combinations
  • Lab 5: Configuring Rewrite Rules

Chapter 8: CoS-Based Forwarding

  • CBF Overview
  • CBF Configuration
  • Lab 6: Configuring CBF

Chapter 9: Case Study

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

Appendix A: CoS Processing on M Series, T Series, and MX Series Devices

  • M Series and T Series Architecture
  • M Series and T Series CoS Packet Handling
  • IQ2 PIC CoS Packet Handling
  • MX Series (DPC and MPC/MIC) Architecture and CoS Packet Handling

Target Audience

This course benefits individuals responsible for configuring and monitoring devices running the Junos OS, especially those in a service provider environment. It also benefits individuals responsible for designing networks containing devices running the Junos OS.

Prerequisites