拓扑：
R4配置：
interface FastEthernet0/0
ip address dhcpR5配置：
ip dhcp excluded-address 192.168.14.1
! ip dhcp pool ***dhcp network 192.168.14.0 255.255.255.0 default-router 192.168.14.1interface Loopback0
ip address 5.5.5.5 255.255.255.0interface FastEthernet0/1
ip address 172.16.35.5 255.255.255.0 duplex auto speed auto ! router rip version 2 network 5.0.0.0 network 172.16.0.0 no auto-summaryR1配置：
ip dhcp relay information option *** //将中继代理插入DHCP 82选项!
! ip vrf pe1 rd 100:1 *** id ACDE48:27 //VRF标识route-target export 100:1 route-target import 100:1 route-target import 100:2 ! mpls label range 100 199 mpls label protocol ldp interface Loopback0 ip address 1.1.1.1 255.255.255.255 ! interface FastEthernet0/0 ip vrf forwarding pe1 ip address 192.168.14.1 255.255.255.0 ip helper-address VRF pe1 172.16.35.5 duplex auto speed auto ! interface FastEthernet0/1 ip address 12.1.1.1 255.255.255.0 duplex auto speed auto mpls ip ! router ospf 100 router-id 1.1.1.1 log-adjacency-changes network 1.1.1.1 0.0.0.0 area 0 network 12.1.1.0 0.0.0.255 area 0 ! router bgp 100 bgp router-id 1.1.1.1 no bgp default ipv4-unicast bgp log-neighbor-changes neighbor 3.3.3.3 remote-as 100 neighbor 3.3.3.3 update-source Loopback0 ! address-family ***v4 neighbor 3.3.3.3 activate neighbor 3.3.3.3 send-community extended exit-address-family ! address-family ipv4 vrf pe1 redistribute connected no synchronization exit-address-family ! mpls ldp router-id Loopback0R2配置：
interface Loopback0
ip address 2.2.2.2 255.255.255.255 ! interface FastEthernet0/0 ip address 23.1.1.2 255.255.255.0 duplex auto speed auto mpls ip ! interface FastEthernet0/1 ip address 12.1.1.2 255.255.255.0 duplex auto speed auto mpls ip ! router ospf 100 router-id 2.2.2.2 log-adjacency-changes network 2.2.2.2 0.0.0.0 area 0 network 12.1.1.0 0.0.0.255 area 0 network 23.1.1.0 0.0.0.255 area 0R3配置：
ip vrf pe2
rd 100:2 route-target export 100:2 route-target import 100:2 route-target import 100:1 ! mpls label range 300 399 mpls label protocol ldp ! interface Loopback0 ip address 3.3.3.3 255.255.255.255 ! interface FastEthernet0/0 ip address 23.1.1.3 255.255.255.0 duplex auto speed auto mpls ip ! interface FastEthernet0/1 ip vrf forwarding pe2 ip address 172.16.35.3 255.255.255.0 duplex auto speed auto ! router ospf 100 router-id 3.3.3.3 log-adjacency-changes network 3.3.3.3 0.0.0.0 area 0 network 23.1.1.0 0.0.0.255 area 0 ! router rip ! address-family ipv4 vrf pe2 redistribute bgp 100 metric transparent network 172.16.0.0 no auto-summary version 2 exit-address-family ! router bgp 100 bgp router-id 3.3.3.3 no bgp default ipv4-unicast bgp log-neighbor-changes neighbor 1.1.1.1 remote-as 100 neighbor 1.1.1.1 update-source Loopback0 ! address-family ***v4 neighbor 1.1.1.1 activate neighbor 1.1.1.1 send-community extended exit-address-family ! address-family ipv4 vrf pe2 redistribute rip no synchronization exit-address-family ! mpls ldp router-id Loopback0验证：