H3C Technologies H3C S5820V2 Series Switches - Manual (Page 7)

1
Configuring MCE
NOTE:
This chapter covers Multi-VPN-Instance CE (MCE) configuration only. For information about routing
protocols, see
Layer 3—IP Routing Configuration Guide.
MCE overview
MPLS L3VPN overview
MPLS L3VPN is a PE-based L3VPN technology. It uses BGP to advertise VPN routes and uses MPLS to
forward VPN packets over the service provider backbone.
MPLS L3VPN provides flexible networking modes, excellent scalability, and convenient support for MPLS
QoS and MPLS TE.
MPLS L3VPN comprises the following types of devices:
• Customer edge (CE) device—A CE resides at the edge of a customer network and has one or more
interfaces directly connected to a service provider network. It can be a router, a switch, or a host.
It can neither "sense" the presence of any VPN nor does it need to support MPLS.
• Provider edge (PE) device—A PE resides at the edge of a service provider network and connects
one or more CEs. On an MPLS network, all VPN services are processed on the PEs.
• Provider (P) device—A P device is a core device on a service provider network. It is not directly
connected to any CE. It has only basic MPLS forwarding capability.
Figure 1 Network diagram for MPLS L3VPN
CEs and PEs mark the boundary between the service provider network and the customers.
VPN 1
CE
Site 1
VPN 2
CE
CE
CE
Site 3
VPN 2
PE
VPN 1
Site 2
Site 4
PE
PE
P P
P P