Junos Class of Service (JCOS)

This two-day intermediate level 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 two case studies. Through demonstrations and hands-on labs, students will gain experience in configuring and verifying Junos CoS features. This course is based on Junos OS Release 23.2R2.21.


Target audience:

Individuals responsible for network administration who configure and administer class-of-service features on Juniper Networks® MX Series Universal Routers running Junos OS


Prerequisites:

  • Basic networking knowledge
  • Experience and familiarity with Junos OS
  • Familiarity with the Junos CLI
  • Completion of Introduction to the Junos Operating System course
  • Completion of the Junos Intermediate Routing course


Objectives:

  • Identify the fundamentals of CoS.
  • Identify and configure packet classification.
  • Describe and configure policers.
  • Configure firewall applications.
  • Identify and configure scheduling components.
  • Identify and configure the components of hierarchical scheduling.
  • Identify and configure rewrite rules.
  • Describe and configure CoS-based forwarding.
  • Discuss and configure an end-to-end VoIP case study.
  • Explain the high-level design for backend and compute networks.


Certification:

JL2V + JL3V + JCOS + JMR + AJSPR + exam : JNCIP-SP (Juniper Networks Certified Internet Professional Service Provider)

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Course Contents: 


DAY 1

1 Class-of-Service Overview

  • Discuss the history and evolution of CoS
  • Define the characteristics of CoS and Differentiated Services
  • Identify the CoS fields in packet headers
  • Discuss the processing of CoS on Junos platforms


2 Packet Classification

  • Discuss classification overview
  • Identify forwarding classes and packet loss priority
  • Configure fixed classification
  • Configure multifield classification
  • Configure behavior aggregate classification
  • Lab 1: Configuring Packet Classification


3 Policing

  • Review policing
  • Configure a single-rate two-color-policer
  • Configure tricolor marking policers
  • Configure hierarchical policers


4 Interface and Firewall Applications

  • Configure an interface application
  • Configure a firewall application
  • Lab 2: Configuring Policers


5 Scheduling

  • Describe scheduling components
  • Describe transmission rate
  • Describe queue priority
  • Describe delay buffers
  • Describe drop profiles
  • Configure scheduling components
  • Lab 3: Configuring Schedulers


DAY 2

6 Hierarchical Scheduling

  • Describe the components of hierarchical scheduling
  • Configure hierarchical scheduling
  • Lab 4: Configuring Hierarchical Schedulers


7 Rewrite Rules

  • Identify the purpose of rewriting packet headers
  • Configure and apply default and custom rewrite rules
  • Lab 5: Configuring rewrite rules


8 CoS-Based Forwarding

  • Identify the purpose of CoS-based forwarding
  • Configure CoS-based forwarding
  • Lab 6: Configuring Class Based Forwarding


9 CoS VoIP Case Study

  • Review the case study
  • Configure the ingress node
  • Configure the transit and egress nodes


10 Congestion Control in Machine Learning Networks

  • Describe IP services for congestion avoidance
  • Configure a lossless IP fabric for RoCEv2 traffic
  • Validate congestion avoidance parameters