User guide

MPLS Module Installation and User Guide 7-1

Configuring MPLS Layer-2 VPNs

The chapter describes Layer-2 VPN services and the following topics:

• Overview of MPLS Layer-2 VPNs on page 7-1

• TLS VPN Characteristics on page 7-5

• Configuring MPLS Layer-2 VPNs on page 7-6

• TLS VPN Configuration Examples on page 7-10

• Using ESRP with MPLS TLS on page 7-17

Overview of MPLS Layer-2 VPNs

The basic idea behind transparent LAN services (TLS) over MPLS is to enable Layer-2

virtual private networking (VPN) service offerings in a simple manner that is easy to

deploy and operate. Layer-2 VPN services, based on a combination of Ethernet and

MPLS/IP technologies, are designed to enable service providers to offer Ethernet

business private line services. These services are also referred to as Transparent LAN

Services (TLS) or Virtual Private LAN Services (VPLS). Layer-2 VPN services use a

simple Layer-2 interface at the customer edge combined with the resilience and

scalability of an MPLS/IP core to provide VPN connectivity.