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.
The Junos Class of Service (JCOS) is an advanced-level course.
DAY 1
Course Introduction
CoS Overview
โข CoS History and Evolution
โข CoS and DiffServ
โข CoS Fields in Packet Headers
โข CoS Processing
Packet Classification
โข Classification Overview
โข Forwarding Classes and Packet Loss Priority
โข Fixed Classification
โข Multifield Classification
โข Behavior Aggregate Classification
Lab 1: Configuring Packet Classification
Policing
โข Policing Overview
โข Single-Rate Two-Color Policer
โข Tricolor Marking Policers
โข Hierarchical Policers
โข ApplicationโDirectly on an Interface
โข ApplicationโWithin a Firewall Filter
Lab 2: Configuring Policers
Scheduling
โข Scheduling Overview
โข Transmission Rate
โข Queue Priority
โข Delay Buffers
โข Drop Profiles and Drop Profile Maps
โข Scheduling Configuration
Lab 3: Configuring Schedulers
DAY 2
Hierarchical Scheduling
โข Hierarchical Scheduling Overview
โข Scheduler Modes
โข Hierarchical Scheduling Levels
โข Throughput Example
โข Remaining Traffic
โข Queue Properties in a Hierarchical Scheduling Context
โข Putting It All Together
Lab 4โConfiguring Hierarchical Scheduling
Rewrite Rules
โข Packet Header Rewrite Overview
โข Rewrite Rules and Tables
โข Rewrite Combinations
Lab 5: Configuring Rewrite Rules
CoS-Based Forwarding
โข CBF Overview
โข CBF Configuration
Lab 6: Configuring CBF
Case Study
โข VoIP Case Study Overview
โข VoIP Case Study: Ingress Node
โข VoIP Case Study: Transit and Egress Nodes
โข Understand the history and evolution of CoS.
โข Identify the CoS fields in various packet headers.
โข List the CoS processing stages on devices running the Junos OS.
โข Identify the default CoS settings on devices running the Junos OS.
โข Configure and verify behavior aggregate (BA) and multifield (MF) classification.
โข Configure and verify two-color and tricolor marking policers.
โข Configure and verify schedulers and their components.
โข Configure and verify the multiple levels of hierarchical schedulers.
โข Configure and verify packet header rewriting.
โข Configure and verify class-based forwarding.
โข Create a CoS configuration based on a set of design requirements.
โข A strong base of networking fundamentals
โข Experience and familiarity with the Junos OS
โข Familiarity with the Junos command-line interface (CLI)
โข Completion of the Introduction to the Junos Operating System (IJOS) course
โข Completion of the Junos Intermediate Routing (JIR) course
This course is intended for network administrators who configure and administer class-of-service features on MX routers running the Junos OS.
