JL2V - Junos Layer 2 VPNs

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​This two-day course is designed to provide students with MPLS-based Layer 2 virtual private network (VPN) knowledge and configuration examples. The course includes an overview of MPLS Layer 2 VPN concepts, such as BGP Layer 2 VPNs, LDP Layer 2 circuits, FEC 129 BGP autodiscovery, virtual private LAN service (VPLS), Ethernet VPN (EVPN), and Inter-AS Layer 2 VPNs. This course also covers Junos operating system-specific implementations of Layer 2 VPN instances, VPLS, and EVPNs. This course is based on the Junos OS Release 15.1R2.9.
Through demonstrations and hands-on labs, students will gain experience in configuring and monitoring the Junos OS and in device operations.

Intended Audience

​This course benefits individuals responsible for configuring and monitoring devices running the Junos OS.

At Completion

After successfully completing this course, you should be able to:

  • Describe the history and rationale for MPLS, as well as its basic terminology.
  • Explain the MPLS label operations (push, pop, swap) and the concept of label-switched path (LSP).
  • Describe the configuration and verification of MPLS forwarding.
  • Describe the functionalities and operation of RSVP and LDP.
  • Configure and verify RSVP-signaled and LDP-signaled LSPs.
  • Select and configure the appropriate label distribution protocol for a given set of requirements.
  • Describe the default Junos OS MPLS traffic engineering behavior.
  • Explain the Interior Gateway Protocol (IGP) extensions used to build the Traffic Engineering Database (TED).
  • Describe the Constrained Shortest Path First (CSPF) algorithm, its uses, and its path selection process.
  • Describe administrative groups and how they can be used to influence path selection.
  • Describe the default traffic protection behavior of RSVP-signaled LSPs.
  • Explain the use of primary and secondary LSPs.
  • Describe the operation and configuration of fast reroute.
  • Describe the operation and configuration of link and node protection.
  • Describe the operation and configuration of LDP loop-free alternate.
  • Describe the LSP optimization options.
  • Explain LSP priority and preemption.
  • Describe the behavior of fate sharing.
  • Describe how SRLG changes the CSPF algorithm when computing the path of a secondary LSP.
  • Explain how extended admin groups can be used to influence path selection.
  • Explain the purpose of several miscellaneous MPLS features.


​Students should have intermediate-level networking knowledge and should be familiar with the Junos OS command-line interface (CLI). Students should also attend the Introduction to the Junos Operating System (IJOS), Junos Routing Essentials (JRE), and Junos Intermediate Routing (JIR) courses prior to attending this class.

Exams & Certifications


Course Outline

Day 1

Chapter 1: Course Introduction


Chapter 2: MPLS Fundamentals

  • MPLS Foundation
  • Terminology
  • MPLS Configuration
  • MPLS Packet Forwarding
  • Lab: MPLS Fundamentals


Chapter 3: Label Distribution Protocols

  • Label Distribution Protocols
  • RSVP
  • LDP
  • Lab: Label Distribution Protocols


Chapter 4: Routing Table Integration

  • Mapping Next Hops to LSPs
  • Route Resolution Example
  • Route Resolution Summary
  • IGP Passive Versus Next-Hop Self for BGP Destinations
  • Lab: Routing Table Integration


Day 2

Chapter 5: Constrained Shortest Path First

  • RSVP Behavior Without CSPF
  • CSPF Algorithm
  • CSPF Tie Breaking
  • Administrative Groups
  • Interarea Traffic Engineered LSPs
  • Lab: CSPF


Chapter 6: Traffic Protection and LSP Optimization

  • Default Traffic Protection Behavior
  • Primary and Secondary LSPs
  • Fast Reroute
  • RSVP Link Protection
  • LDP LFA and Link Protection
  • LSP Optimization
  • Lab: Traffic Protection


Chapter 7: Fate Sharing

  • Junos OS Fate Sharing
  • SRLG
  • Extended Admin Groups
  • Lab: Fate Sharing


Chapter 8: Miscellaneous MPLS Features

  • Forwarding Adjacencies
  • Policy Control over LSP Selection
  • LSP Metrics
  • Automatic Bandwidth
  • Container LSPs
  • TTL Handling
  • Explicit Null Configuration
  • MPLS Pings
  • Lab: Miscellaneous MPLS Features



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