JCOS : JUNOS Class of Service

  • Duration: 2 days
  • Test Level: 2
  • Certifications: JNCIS-SP
  • Price: $1,595.00
  • Exams: No Exam
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 case studies that reenforce topics.

Through demonstrations and hands-on labs, students will gain experience in configuring and monitoring the JUNOS Software and monitoring basic device operations.
  • 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

Chapter 1: Course Introduction

Chapter 2: CoS Overview
  • CoS History and Evolution
  • CoS and DiffServe
  • CoS Fields in Packet Headers
  • CoS Processing

Chapter 3: Packet Classification
  • Classification Overview
  • Forwarding Classes and Packet Loss Priority
  • Fixed Classification
  • Multifield Classification
  • Behavior Aggregate Classification

Chapter 4: Policing
  • Policing Overview
  • Single-Rate Two-Color Policer
  • Tricolor Marking Policers
  • Application—Directly on an Interface
  • Application—Within a Firewall Filter

Chapter 5: Scheduling
  • Scheduling Overview
  • Transmission Rate
  • Queue Priority
  • Delay Buffers
  • Drop Profiles and Drop Profile Maps
  • Scheduling Configuration

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

Chapter 7: Rewrite Rules
  • Packet Header Rewrite Overview
  • Rewrite Rules and Tables
  • Rewrite Combinations

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
This is an advanced level course.

Students should have intermediate-level networking knowledge and an understanding of the OSI model and the TCP/IP protocol suite. Students should also have familiarity with the Protocol Independent Multicast-Sparse Mode (PIM-SM) protocol.

Students should have already attended Introduction to JUNOS Operating Systems (IJOS) , JUNOS Routing Essentials (JRE) and the Junos Intermediate Routing (JIR) courses or have equivalent knowledge provided in these titles.

This course is available as open-enrollment Classroom event, instructor-led Live Virtual Class, REAL-ILT™ or as part of a custom Onsite Training for up to 8 students.