Layer 2 Circuits

After the introduction and early adoption of Layer 3 virtual private networks (VPNs) based on RFC 2547bis, many customers asked their service providers to offer VPNs that would preserve data at Layer 2. One of the Layer 2 VPN options that has emerged is known as a Layer 2 circuit. It based on a series of Internet Engineering Task Force (IETF) drafts authored by Luca Martini. These so-called "Martini-drafts," including Encapsulation Methods for Transport of Layer 2 Frames Over IP and MPLS Networks (draft-martini-l2circuit-encap-mpls-06.txt) and Transport of Layer 2 Frames Over MPLS (draft-martini-l2circuit-trans-mpls-13.txt), establish the basis for Juniper Networks implementation of Layer 2 circuits. This guide shows how to implement Layer 2 circuits in a variety of ways.

This feature guide covers these topics:

• Overview
• System Requirements
• Terms and Acronyms
• Configure Layer 2 Circuits

• Example: Ethernet-Based Layer 2 Circuit Configuration
• Check Your Work
• Example: SONET/SDH-Based Layer 2 Circuit Configuration
• Check Your Work
• Example: ATM2 IQ-Based Layer 2 Circuit Configuration
• Check Your Work
• Example: Layer 2 Circuit Traffic Engineering over Multiple LSPs Configuration
• Check Your Work
• Example: APS for Layer 2 Circuits Configuration
• Check Your Work

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• Revision History