This three-day course is designed to provide students with the knowledge to configure and troubleshoot MPLS-based Layer 2 virtual private
networks (VPN). The course includes an overview of MPLS Layer 2 VPN concepts, such as BGP Layer 2 VPNs, LDP Layer 2 circuits, forwarding
equivalence class (FEC) 129, virtual private LAN service (VPLS), Ethernet VPN (EVPN), and Inter-AS MPLS VPNs.

This course also covers Junos OSspecific implementations of Layer 2 VPN instances, VPLS, and EVPNs. This course is based on the Junos OS Release 21.4R1.12.

Associated Certification:
JNCIP-SP

• Describe some of the different kinds of VPNs, their mechanics, and their use cases
• Describe the types of MPLS VPN that operate at layer 2.
• Describe the mechanics of BGP-signaled pseudowires, also known as L2VPNs.
• Configure BGP-signaled L2VPNs with Ethernet and Ethernet-VLAN encapsulations.
• Demonstrate how to troubleshoot some of the most common BGP-signaled L2VPN configuration problems.
• Describe how BGP-signaled L2VPNs use a block of labels to bring efficiency tohuband-spoke advertisements.
• Configure advanced BGP-signaled L2VPN features, such as multihoming, VLAN normalization, and route target constraint.
• Describe the mechanics of LDP-signaled pseudowires, also known as Layer 2 Circuits.
• Describe the causes and solutions of some of the most common L2Circuit configuration problems.
• Configure advanced LDP-signaled L2Circuit features, such as multihoming and local switching.
• Explain how the FEC 129 pseudowire method combines BGP for autodiscovery and LDP for signaling.
• Describe the purpose and mechanics of a VPLS.
• Create a VPLS instance that is signaled using BGP and demonstrate the commands that verify its status.
• Create VPLS instances that are signaled using LDP and FEC 129 and demonstrate the commands available to verify their status.
• Describe how mismatched VLAN tags are handled in a default VPLS configuration.
• Configure a VPLS to swap mismatched VLAN tags automatically, and to create multiple bridge domains inside a single VPLS instance.
• Configure the most important VPLS traffic management features, including flood protection, MAC limiting, IRB interfaces, and automated Site IDs.
• Configure hub-and-spoke VPLS topologies.
• Configure multihomed sites in a VPLS.
• Describe the features of Ethernet VPN, and the enhancements that EVPN brings over VPLS.
• Explain how EVPNs advertise MAC addresses, and how they request to receive flooded traffic within a bridge domain.
• Configure and verify a single-homed VLAN-based EVPN instance.
• Configure and verify a single-homed VLAN-aware bundle EVI.
• Configure a multihomed EVPN and explain the purpose of the EVPN Type 4 route.
• Describe the features provided by EVPN Type 1 routes.
• Describe how to use MAC Mobility and IRB interfaces in an EVPN.
• Explain how EVPNs can tightly integrate themselves into MPLS Layer 3 VPNs to provide highly efficient forwarding.
• Describe and configure various solutions that create MPLS VPNs between service providers.
• Describe the circuit-cross connect pseudowire method and explain how this old method can still have value in modern networks.
• Describe how multisegment pseudowires can create layer 2 VPNs across autonomous system boundaries.

DAY 1

1. Course Introduction

2. Refresher—VPNs and MPLS

• Explain the basic function and purpose of a VPN
• Describe how MPLS uses labels to forward traffic
• Explain the differences between MPLS layer 3 VPNs and MPLS layer 2 VPNs

3. The Different Flavors of Layer 2 VPN

• Describe the purpose and creation of pseudowires
• Define the different technical terms relating to pseudowires
• Describe the purpose and creation of VPLS
• Describe the purpose, creation, and advantages of EVPN

4. L2VPN, aka BGP-Signaled Pseudowires

• Define the concept of an attachment circuit, and of pseudowire encapsulation
• Explain the importance of route targets, route distinguishers, and Site IDs
• Explain the control plane and data plane of an L2VPN
• Describe the contents of an L2VPN BGP packet capture

5. L2VPN—Configuration

• Configure an L2VPN that accepts all Ethernet traffic
• Configure an L2VPN that accepts specific VLAN tags

6. L2VPN—Troubleshooting

• Diagnose and fix L2VPN problems caused by missing LSPs, mismatched site information, and incorrect configuration

7. L2VPN—Site IDs, the Label Base, and Overprovisioning

• Explain the purpose of the Site ID and the VPN label base
• Configure an overprovisioned L2VPN with explicit remote Site IDs
• Configure an overprovisioned L2VPN with implicit remote Site IDs

Lab 1: BGP-Signaled Layer 2 VPNs

8. L2VPN—Advanced Concepts

• Configure and verify L2VPN multihoming
• Explain the purpose of Martini encapsulation
• Configure VLAN normalization in an L2VPN
• Configure out-of-band route reflection and route target constraint

Lab 2: L2VPNs—Advanced Concepts

9. L2Circuit—LDP-Signaled Pseudowires

• Explain the concept of targeted LDP sessions, and the elements that L2Circuits have in common with L2VPNs
• Configure and verify an L2Circuit
• Describe the contents of an LDP advertisement packet capture

10. L2Circuit—Troubleshooting

• Configure the Pseudowire Status TLV
• Explain the meaning of the most frequent L2Circuit error codes

DAY 2

11. L2Circuit—Advanced Concepts

• Describe the purpose and benefits of virtual circuit connectivity verification
• Configure multihoming, local switching, and interworking

Lab 3: LDP-Signaled L2Circuits

12. FEC 129 Pseudowires

• Explain the way that FEC 129 autodiscovers remote PEs and signals pseudowires
• Configure and verify a FEC 129 pseudowire

Lab 4: FEC 129 Pseudowires (Optional)

13. Virtual Private LAN Service—Introduction

• Describe how a VPLS is built, and how it compares to a regular pseudowire
• Explain how VPLS forwards traffic between multiple sites
• Describe the BGP and LDP methods of signaling a VPLS

14. VPLS—BGP Configuration and Verification

• Configure a BGP-signaled VPLS
• Verify a BGP-signaled VPLS

15. VPLS—LDP and FEC 129 Configuration and Verification

• Configure and verify an LDP-signaled VPLS
• Configure and verify a FEC 129 VPLS

16. VPLS—The Default VLAN Mode

• Define the four VLAN modes for VPLS
• Define the concept of a bridge domain, and verify the default VPLS VLAN mode

17. VPLS—VLAN Normalization, VLAN-Aware Instances, and Dual-Stacked VLANs

• Configure and verify VLAN-Aware mode
• Configure and verify VLAN-Normalizing mode and NoVLAN mode
• Configure and verify dual-stacked VLAN tags in VPLS

18. VPLS—Advanced Features and Troubleshooting

• Deploy automated BGP VPLS Site IDs
• Configure flood protection, MAC flap protection, and MAC limiting
• Explain how to add IRB interfaces to a VPLS, and configure efficient traffic flooding using multicast LSPs
• Describe the most important VPLS-specific troubleshooting techniques

19. VPLS—Multihoming

• Configure multihomed sites in a BGP-signaled VPLS
• Configure multihomed sites and single sites on the same PE in a BGP-signaled VPLS
• Configure best-site multihoming in a BGP-signaled VPLS
• Configure multihomed sites in an LDP-signaled VPLS

Lab 5: VPLs

Days 3

20. EVPN—Introduction

• Explain the main disadvantages of a VPLS solution
• Explain how EVPN overcomes these disadvantages, and enables extra features

21. EVPN—Using BGP to Advertise MACs and to Flood Traffic

• Explain the meaning of an EVPN Instance
• Describe how EVPN Type 2 routes advertise MAC addresses and MAC/IP bindings
• Describe how EVPN Type 3 routes request to receive flooded traffic within a bridge domain

22. EVPN—Configuring a Single-Homed VLAN-Based EVI

• Configure a service provider network to host EVPN services
• Configure a single-homed VLAN-based EVI
• Verify a VLAN-based EVI

23. EVPN—Configuring a Single-Homed VLAN-Aware Bundle EVI

• Configure a VLAN-aware bundle EVI
• Verify a VLAN-aware bundle EVI

24. EVPN—Multihoming Configuration and Type 4 Routes

• Configure a CE and two PEs to take part in a multihomed EVPN
• Describe the contents of the Type 4 Ethernet Segment route
• Explain how the Type 4 route prevents layer 2 loops, using the designated forwarder election

25. EVPN—Multihoming Features Using Type 1 Routes

• Describe Type 1 Ethernet Auto-Discovery Per-Ethernet Segment routes
• Explain how Type 1 Per-Ethernet Segment routes prevent layer 2 loops
• Describe how Type 1 Per-EVI routes are different from Per-ES routes

26 EVPN—MAC Mobility and IRB Interfaces

• Configure and verify the EVPN MAC Mobility feature
• Configure and verify Automatic Gateway MAC-IP Synchronization
• Configure and verify Manual Gateway MAC-IP Synchronization
• Configure and verify EVPN Virtual Gateway Addresses

Lab 6: EVPN

SELF-STUDY MATERIALS

A EVPN—Integration with L3VPNs

• Describe the basic functionality of an L3VPN
• Explain how EVPNs and L3VPNs integrate for optimal routing
• Describe how chained composite next hop brings efficiency to EVPN in the Packet Forwarding Engine B Inter-AS MPLS VPNs
• Describe the functionality of Interprovider Options A, B, and C
• Configure and verify the Interprovider Option C method
• Describe and configure carrier-of-carriers VPNs C Circuit Cross-Connect
• Use circuit cross-connect to stitch pseudowires together, and to signal pseudowires that have their own pair of dedicated RSVP LSPs D Multisegment Pseudowires
• Explain how a multisegment pseudowire is signaled
• Configure and verify a multisegment pseudowire

Lab 7: Inter-AS L2VPNs

E VPLS—Hub-and-Spoke Topologies

• Configure a hub-and-spoke BGP VPLS using route targets
• Configure a hub-and-spoke BGP VPLS using site ranges
• Configure a hub-and-spoke LDP VPLS using hierarchical VPLs

Benefits individuals responsible for configuring and monitoring devices running the Junos OS in a service provider environment, in MPLS-based data centers, and in larger enterprises

• Intermediate-level networking knowledge;
• An understanding of OSPF, IS-IS, BGP, and Junos routing policy;
• Experience configuring MPLS label-switched paths using Junos;
• Completion of the following courses, or equivalent knowledge
  • Introduction to the Junos Operating System
  • Junos Service Provider Switching
  • Junos Intermediate Routing
  • Junos MPLS Fundamentals