Junos Class of Service (JCOS)

Junos Class of Service (JCOS) 

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.



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Course Level

Junos Class of Service (JCOS) is an advanced level course.

Intended 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

Students should have the following prerequisite skills:

  • 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; and
  • Completion of the Junos Intermediate Routing (JIR) course.

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 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

Course Contents

Day 1

Module 1: Course Introduction

Module 2: CoS Overview

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

Module 3: Packet Classification

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

Module 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

Module 5: Scheduling

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

Day 2

Module 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

Module 7: Rewrite Rules

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

Module 8: CoS-Based Forwarding

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

Module 9: Case Study

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

Schedule
  Below is a list of scheduled dates when this event will take place. Some events require registration for attendance so you will need to click on the date for more information regarding the specific event.

If you don't see the date you prefer, please contact us to request a date or schedule your custom training session.

Display dates for 

 
Date  Subject Region Location Facilitator Language Status
8/23/2021 9:00 AM CET Junos Class of Service (JCOS) - ILO Europe, Middle East and Africa (EMEA) Instructor-led Online Juniper Networks English Open
9/6/2021 Junos Class of Service (JCOS) - ILT & ILO Europe, Middle East and Africa (EMEA) Stuttgart, Germany + Online Fast Lane German Open
9/13/2021 Junos Class of Service (JCOS) - ILT & ILO Americas (AMER) Panama + Online Academia InSite Spanish Open
9/20/2021 7:30 AM PST Junos Class of Service (JCOS) - ILO Americas (AMER) Instructor-led Online Juniper Networks English Open
11/8/2021 Junos Class of Service (JCOS) - ILT & ILO Europe, Middle East and Africa (EMEA) Düsseldorf, Germany + Online Fast Lane German Open
12/1/2021 9:00 AM CET Junos Class of Service (JCOS) - ILO Europe, Middle East and Africa (EMEA) Instructor-led Online Juniper Networks English Open
2/14/2022 9:00 AM CET Junos Class of Service (JCOS) - ILO Europe, Middle East and Africa (EMEA) Instructor-led Online Juniper Networks English Open