179
7BConfiguring MPLS L3VPN
89B
Overview
MPLS L3VPN is a L3VPN technology used to interconnect geographically dispersed VPN sites.
MPLS L3VPN uses BGP to advertise VPN routes and uses MPLS to forward VPN packets over a
service provider backbone.
MPLS L3VPN provides flexible networking modes, excellent scalability, and convenient support for
MPLS TE.
221BBasic MPLS L3VPN architecture
Figure 44 Basic MPLS L3VPN architecture
A basic MPLS L3VPN architecture has the following types of devices:
• Customer edge device—A CE device resides on a customer network and has one or more
interfaces directly connected to a service provider network. It does not support MPLS.
• Provider edge device—A PE device resides at the edge of a service provider network and is
connected to one or more CEs. All MPLS VPN services are processed on PEs.
• Provider device—A P device is a core device on a service provider network. It is not directly
connected to any CEs. A P device has only basic MPLS forwarding capability and does not
handle VPN routing information.
222BMPLS L3VPN concepts
443BSite
A site has the following features:
• A site is a group of IP systems with IP connectivity that does not rely on any service provider
networks.
VPN 1
CE
Site 1
VPN 2
CE
CE
CE
Site 3
VPN 2
PE
VPN 1
Site 2
Site 4
PE
PE
PP
P
P
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