3.1 Introduction to BGP/MPLS IP VPN
This section describes the concepts and roles of the PE, P, and CE.
BGP/MPLS IP VPN is a PE-based L3VPN technology used in the Provider Provisioned VPN
(PPVPN) solution. BGP/MPLS IP VPN uses BGP to advertise VPN routes and MPLS to forward
VPN packets on the provider's backbone network.
Characterized by flexible networking modes, excellent extensibility, and convenient support for
MPLS QoS and MPLS TE, BGP/MPLS IP VPN is widely used.
shows the networking diagram of BGP/MPLS IP VPN.
Figure 3-1
BGP/MPLS IP VPN model
CE
CE
CE
Service
provider's
backbone
CE
VPN 1
Site
Site
Site
Site
VPN 1
VPN 2
PE
PE
PE
P
P
P
P
VPN 2
The BGP/MPLS IP VPN model consists of the following parts:
l
A Customer Edge (CE) is an edge device on the customer network, which has one or more
interfaces directly connected to the service provider network. A CE can be a switch, a
router or a host. Mostly, CEs cannot "sense" the existence of the VPN, and do not need to
support MPLS.
l
A Provider Edge (PE) is an edge device on the provider network, which is directly connected
to the CE. In the MPLS network, PEs perform all the VPN-related processing.
l
A Provider (P) is a backbone device on the provider network, which is not directly
connected to the CE. Ps only need to possess basic MPLS forwarding capabilities and do
not need to maintain information about VPNs.
l
A site is a group of IP systems that have IP connectivity among themselves without being
connected to the service provider network. A site is connected to the provider network
through the CE. A site may contain many CEs, but a CE belongs only to a single site.
3.2 BGP/MPLS IP VPN Features Supported by the S7700
The S7700 supports basic and typical networking of the BGP/MPLS IP VPN, and such features
as reliability and QoS of the BGP/MPLS IP VPN.
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
3 BGP MPLS IP VPN Configuration
Issue 01 (2011-07-15)
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