3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 37  BGP/MPLS VPN Configuration

 

37-10 

compromised method brings additional configuration burden and has limitation in 

actual use. 

To resolve this problem, the idea of multi-role host is generated. Specifically to say, this 

idea is to differentiate the accesses to different VPNs through configuring policy routing 

based on IP addresses, and transmit downstream data flow from PE to CE by 

configuring static routing. The static routing under multi-role host circumstance is 

different from common hosts; it is implemented by specifying an interface of another 

VPN as the egress interface through a static route in a VPN; and thus allowing one 

logical interface to access multiple VPNs. 

Implementing BGP/MPLS VPN functions requires the following procedures in general: 

Configure basic information on PE, CE and P; establish the logical or physical link with 

IP capabilities from PE to PE; advertise and update VPN network information. 

The configuration on CE is relative simple. Only static route, RIP, OSPF or EBGP 

configuration is needed for VPN routing information exchange with the PE connected, 

MPLS configuration is not needed. 

The configuration on PE is relative complex. After the configuration, the PE implements 

MPLS/BGP VPN core functions. 

The following sections describe the configuration tasks on a PE device: 

z 

z 

z 

z 

The configuration on P device is relative simple. The main task is to configure MPLS 

basic capacity on the P device to support LDP and MPLS forwarding. 

The following are detailed configurations. 

As a customer-side device, only basic configuration is required on a CE router, for 

routing information exchange with PE router. Currently route switching modes available 

include static route, RIP, OSPF, EBGP, and so on.