O'Reilly logo

Networks and Services: Carrier Ethernet, PBT, MPLS-TP, and VPLS by Mehmet Toy

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 14: Virtual Private LAN Services (VPLS)

14.1 Introduction

Multiprotocol Label Switching (MPLS) is generally accepted as the common convergence technology and facilitates the deployment and management of Virtual Private Networks (VPNs). MPLS-based VPN can be classified as either a layer 2 [1, 2] or a layer 3 point-to-point service or multipoint service:

  • Layer 3 multipoint VPNs or Internet Protocol (IP) VPNs that are often referred to as Virtual Private Routed Networks (VPRNs),
  • Layer 2 point-to-point VPNs, which basically consist of a collection of separate Virtual Leased Lines (VLLs) or pseudowires (PW), and
  • Layer 2 multipoint VPNs, or Virtual Private LAN Services (VPLSs).

VPLS is a multipoint service, but unlike IP VPNs, it can transport non-IP traffic and leverages advantages of Ethernet. VPLS is also used within a service provider's (SP) network to aggregate services for delivery to residential and enterprise customers.

Regardless of how the VPN service is used, most enterprise customers use routers at the LAN/WAN boundary. However, VPLS is a layer 2 VPN service and allows the use of layer 2 switches as the customer edge (CE) device.

VPLS is introduced by RFC 2764 [1], as a VPN service, which emulates a LAN segment using IP-based facilities (Fig. 14.1) for a given users. In other words, VPLS creates a layer 2 broadcast domain that is fully capable of learning and forwarding on Ethernet Media Access Control (MAC) addresses. Multiple CEs such as bridges, router, layer ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required