Junos Class of Service

  • Duration: 2 Days (16 Hours)
  • Certified Trainers
  • Practice Labs
  • Digital Courseware
  • Access to the Recordings
  • Experience 24*7 Learner Support.

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Junos Class of Service Training Course Overview

In this intensive two-day course, students will delve into advanced class-of-service (CoS) concepts and gain practical configuration expertise. The curriculum starts with an overview of CoS and progresses to cover classification, policing, scheduling, and rewriting. The course also explores class-based forwarding and concludes with a comprehensive case study. Through a combination of demonstrations and hands-on labs, participants will acquire valuable experience in configuring and verifying Junos CoS features. Based on the Junos operating system Release 21.1R1, this course ensures that students are equipped with up-to-date knowledge and hands-on skills in advanced CoS configuration.

Intended Audience For Junos Class of Service Training

  • Network Engineers
  • Network Administrators
  • Network Architects
  • Technical Support Staff
  • System Integrators
  • IT Managers
  • Network Designers
  • IT Professionals with a Focus on Quality of Service (QoS)
  • Service Provider Operations Staff
  • Anyone Working with Class of Service in Juniper Networks

Learning objectives for the Junos Class of Service training course

  • 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.

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Benefits of taking the Junos Class of Service training

  • Thorough Understanding of CoS:
    • Gain in-depth knowledge of Class of Service concepts and principles in Junos.
  • Effective Configuration Skills:
    • Develop hands-on skills in configuring and managing CoS settings to prioritize and control network traffic.
  • Enhanced Network Performance:
    • Learn how to optimize network performance by implementing Quality of Service (QoS) through CoS configurations.
  • Traffic Prioritization:
    • Understand how to prioritize and control different types of traffic to meet specific service level agreements (SLAs).
  • Hands-On Labs and Demonstrations:
    • Engage in practical labs and demonstrations to reinforce theoretical knowledge and gain real-world experience in implementing CoS.
  • Troubleshooting Proficiency:
    • Acquire expertise in troubleshooting CoS-related issues, ensuring smooth and efficient network operations.
  • Versatility Across Juniper Platforms:
    • Learn CoS configurations applicable to various Juniper hardware platforms, ensuring adaptability to different network architectures.
  • Up-to-Date Knowledge:
    • Stay current with the latest Junos OS Release, ensuring your skills align with the latest software versions and features.
  • Optimized Network Utilization:
    • Learn techniques to optimize network utilization by effectively managing and controlling traffic using CoS.
  • Preparation for Certification:
    • The training can serve as preparation for Juniper certification exams related to Class of Service, validating your expertise.
  • Career Advancement:
    • Add valuable CoS skills to your professional portfolio, making you a sought-after professional in the networking industry.
  • Community Engagement:
    • Connect with a community of networking professionals, facilitating collaboration and knowledge-sharing opportunities.

Junos Class of Service Training Course Modules

Module 1: Course Introduction

  • Overview and introduction to the course.

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

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 Scheduling

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

Junos Class of Service Training Course Prerequisites

  • 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

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  • Convenience
  • Cost-effective
  • Self-paced learning
  • Scalability


  • Interaction and collaboration
  • Networking opportunities
  • Real-time feedback
  • Personal attention


  • Familiar environment
  • Confidentiality
  • Team building
  • Immediate application

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