CHAPTER 8
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 Overview on page 513
•
MPLS Shim Interfaces for Layer 2 Services over MPLS Overview on page 514
•
Multiple Layer 2 Services over MPLS Overview on page 515
•
ATM Layer 2 Services over MPLS Overview on page 515
•
HDLC Layer 2 Services over MPLS Overview on page 520
•
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:
509Copyright © 2010, Juniper Networks, Inc.
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