5 mpls l2vpn configuration, Mpls l2vpn overview, Introduction to mpls l2vpn – H3C Technologies H3C S7500E Series Switches User Manual
Page 193: Traditional vpn, Mpls l2vpn, Mpls l2vpn configuration
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MPLS L2VPN Configuration
When configuring MPLS L2VPN, go to these sections for information you are interested in:
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MPLS L2VPN Configuration Task List
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Displaying and Maintaining MPLS L2VPN
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MPLS L2VPN Configuration Examples
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The term router in this document refers to a router in a generic sense or a Layer 3 switch.
MPLS L2VPN Overview
This section covers these topics:
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Introduction to MPLS L2VPN
Traditional VPN
Traditional VPNs based on Asynchronous Transfer Mode (ATM) or Frame Relay (FR) are quite
popular. They share the network infrastructure of carriers. However, they have some inherent
disadvantages:
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Dependence on dedicated media: To provide both ATM-based and FR-based VPN services,
carriers must establish two separate infrastructures across the whole service scope, one ATM
infrastructure and one FR infrastructure. Apparently, the cost is very high and the infrastructures
are not utilized efficiently.
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Complicated deployment: To add a site to an existing VPN, you have to modify the configurations
of all edge nodes connected with the VPN site.
MPLS L2VPN is developed as a solution to address the above disadvantages.
MPLS L2VPN
MPLS L2VPN provides Layer 2 VPN services on the MPLS network. It allows carriers to establish
L2VPNs on different data link layer protocols, including ATM, FR, VLAN, Ethernet and PPP.