78 MPLS L2VPN CONFIGURATIONWhen configuring MPLS L2VPN, go to these sections for information you areinterested in:■ “MPLS L2VPN Overview” on page 1425■ “Configuring MPLS L2VPN” on page 1429■ “Configuring a PE Interface Connecting a CE” on page 1430■ “Configuring CCC MPLS L2VPN” on page 1432■ “Configuring SVC MPLS L2VPN” on page 1433■ “Configuring Martini MPLS L2VPN” on page 1434■ “Configuring Kompella MPLS L2VPN” on page 1435■ “Displaying and Maintaining MPLS L2VPN” on page 1438■ “MPLS L2VPN Configuration Example” on page 1438■ “Troubleshooting MPLS L2VPN” on page 1456MPLS L2VPN Overview This section covers these topics:■ “Introduction to MPLS L2VPN” on page 1425■ “CCC MPLS L2VPN” on page 1428■ “SVC MPLS L2VPN” on page 1428■ “Martini MPLS L2VPN” on page 1428■ “Kompella MPLS L2VPN” on page 1429Introduction to MPLSL2VPNTraditional VPNTraditional VPNs based on asynchronous transfer mode (ATM) or frame relay (FR)are quite popular. They share the network infrastructure of carriers. However, theyhave some inherent disadvantages:■ Dependence on dedicated media: To provide both ATM-based and FR-basedVPN services, carriers must establish two separate infrastructures across thewhole service scope, one ATM infrastructure and one FR infrastructure.Apparently, the cost is very high and the infrastructures are not utilizedefficiently.■ Complicated deployment: To add a site to an existing VPN, you have to modifythe configurations of all edge nodes connected with the VPN site.MPLS L2VPN is developed as a solution to address the above disadvantages.
