配置
本例中的5 台路由器配置如下：
 
Pescara
Current configuration:
!
version 12.2
!
hostname Pescara
!
ip cef
!
!--- Customer_A 的配置.
ip vrf Customer_A
!---启用Customer_A 的××× 路由和转发表 (VRF).
rd 100:110
!--- Route distinguisher creates routing and forwarding
!--- tables for a VRF.
route-target export 100:1000
!--- Creates lists of import and export route-target extended
!--- communities for the specified VRF.
route-target import 100:1000
!
!--- Customer_B 配置.
ip vrf Customer_B
rd 100:120
route-target export 100:2000
route-target import 100:2000
!
interface Loopback0
ip address 10.10.10.4 255.255.255.255
ip router isis
!--- Customer_A 的配置.
interface Loopback101
ip vrf forwarding Customer_A
!---将一个接口或者自接口和一个VRF 实例关联起来.
ip address 200.0.4.1 255.255.255.0
!--- Loopback101 和 102 使用相同的IP 地址 200.0.4.1.这是准许的，因为它们属于2 个不用
客户的VRF
no ip directed-broadcast
!
!--- Customer_B 的配置.
interface Loopback102
ip vrf forwarding Customer_B
ip address 200.0.4.1 255.255.255.0
!--- Loopback101 和 102 使用相同的IP 地址 200.0.4.1.这是准许的，因为它们属于2 个不用
客户的VRF
no ip directed-broadcast
!
interface Serial2/0
no ip address
no ip directed-broadcast
encapsulation frame-relay
no fair-queue
!
interface Serial2/0.1 point-to-point
description link to Pauillac
bandwidth 512
ip address 10.1.1.14 255.255.255.252
no ip directed-broadcast
ip router isis
tag-switching ip
frame-relay interface-dlci 401
!
router isis
net 49.0001.0000.0000.0004.00
is-type level-1
!
router bgp 100
bgp log-neighbor-changes
!--- 启用BGP 邻居关系中断的记录.
neighbor 10.10.10.6 remote-as 100
neighbor 10.10.10.6 update-source Loopback0
!--- 配置BGP 邻居.
!
!--- Customer A and B commands.
address-family ***v4
!--- 进入address-family ***v4 配置模式，配置和PE/P 路由器间的MP-BGP 路由会话。
neighbor 10.10.10.6 activate
neighbor 10.10.10.6 send-community both
!--- Sends the community attribute to a BGP neighbor.
exit-address-family
!
!--- Customer B commands.
address-family ipv4 vrf Customer_B
!--- 进入address-family ipv4 的配置模式下，配置和CE 间的路由会话，
redistribute connected
no auto-summary
no synchronization
exit-address-family
!
!--- Customer A commands.
address-family ipv4 vrf Customer_A
redistribute connected
no auto-summary
no synchronization
exit-address-family
!
ip classless
!
end