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Chapter 6

Layer 2 Services over MPLS Overview

This chapter contains the following sections:

■ Layer 2 Services over MPLS Overview on page 509

■ Layer 2 Services over MPLS Platform Considerations on page 510

■ Layer 2 Services over MPLS References on page 511

■ Layer 2 Services over MPLS Implementation on page 512

■ Local Cross-Connects Between Layer 2 Interfaces Using MPLS on page 513

■ MPLS Shim Interfaces for Layer 2 Services over MPLS on page 513

■ Multiple Layer 2 Services over MPLS on page 515

■ ATM Layer 2 Services over MPLS on page 515

■ HDLC Layer 2 Services over MPLS on page 519

■ CE-Side MPLS L2VPNs over LAG Overview on page 521

■ Ethernet Raw Mode Encapsulation for Martini Layer 2 Transport

Overview on page 522

■ S-VLAN Subinterface with an Untagged C-VLAN ID Overview on page 524

■ Multiple ATM Virtual Circuits over a Single Pseudowire Overview on page 524

Layer 2 Services over MPLS Overview

Many Internet service providers offer multiple services such as Frame Relay,

Asynchronous Transfer Mode (ATM), Ethernet, High-Speed Data Link Control (HDLC),

and IP to their customers, but are consolidating to a single, packet-based, optical

network from several service-specific legacy layer 2 networks. Although legacy layer

2 network links are disappearing from the Internet service provider’s network, the

legacy layer 2 network links and services to customers must remain.

Layer 2 services over IP/MPLS enable service providers to emulate the legacy layer

2 network links and services over their IP/MPLS-based network. Layer 2 services

over MPLS are especially desirable because MPLS provides features such as traffic

engineering and fast reroute. These MPLS features can be used to emulate certain

layer 2 service characteristics. From the perspective of the customer edge (CE) devices,

all that exists is the layer 2 circuit, even though the circuit actually exists over the

service provider’s MPLS network.

The JUNOSe software currently support the following layer 2 services over MPLS:

Layer 2 Services over MPLS Overview ■ 509

Juniper BGP - CONFIGURATION GUIDE V 11.1.X User Manual

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