R1、R5路由器用动态路由协议OSPF来宣告路由；R2、R4建立BGP邻居，连接R1、R5、R6、R7的接口启动vrf空间，配置MPLS-×××，生成×××V4下的BGP表；R2、R3、R4用MPLS防止路由黑洞，R2、R4通过双向重发布是全网获得所有路由；R6、R7启动BGP，保持和R2、R4相同的route-target值，可以使全网互通。 配置如下： **R1: ** interface Loopback0 ip address 192.168.1.1 255.255.255.0 interface Serial1/1 ip address 192.168.2.1 255.255.255.0 router ospf 1 router-id 192.168.1.1 log-adjacency-changes network 192.168.1.1 0.0.0.0 area 0 network 192.168.2.1 0.0.0.0 area 0 R2: ip vrf 6 rd 100:6 route-target export 1:1 route-target import 1:1 ip vrf eilm rd 100:1 route-target export 1:1 route-target import 1:1 ip vrf forwarding ip cef mpls label range 200 299

interface Loopback0 ip address 2.2.2.2 255.255.255.0 ! interface FastEthernet0/0 ip vrf forwarding 6 ip address 26.1.1.2 255.255.255.0 duplex half ! interface Serial1/0 ip vrf forwarding eilm ip address 192.168.2.2 255.255.255.0 serial restart-delay 0 ! interface Serial1/1 ip address 23.1.1.2 255.255.255.0 router eigrp 90 network 2.0.0.0 network 23.0.0.0 no auto-summary ! router ospf 1 vrf eilm router-id 2.2.2.2 log-adjacency-changes redistribute bgp 1 subnets network 192.168.2.2 0.0.0.0 area 0 ! router bgp 1 no synchronization bgp router-id 2.2.2.2 bgp log-neighbor-changes neighbor 4.4.4.4 remote-as 1 neighbor 4.4.4.4 update-source Loopback0 no auto-summary !
address-family vpnv4 neighbor 4.4.4.4 activate neighbor 4.4.4.4 send-community both exit-address-family ! address-family ipv4 vrf eilm redistribute ospf 1 no auto-summary no synchronization exit-address-family ! address-family ipv4 vrf 6 neighbor 26.1.1.6 remote-as 6 neighbor 26.1.1.6 activate no auto-summary no synchronization exit-address-family R3: ip cef mpls label range 300 399 interface Loopback0 ip address 3.3.3.3 255.255.255.0 interface Serial1/0 ip address 23.1.1.3 255.255.255.0 tag-switching ip serial restart-delay 0 ! interface Serial1/1 ip address 34.1.1.3 255.255.255.0 router eigrp 90 network 3.0.0.0 network 23.0.0.0 network 34.0.0.0 no auto-summary R4：

ip vrf 7 rd 100:7 route-target export 1:1 route-target import 1:1 ! ip vrf eason rd 100:5 route-target export 1:1 route-target import 1:1 ! ip cef mpls label range 400 499 interface Loopback0 ip address 4.4.4.4 255.255.255.0 ! interface FastEthernet0/0 ip vrf forwarding 7 ip address 47.1.1.4 255.255.255.0 duplex half ! interface Serial1/0 ip address 34.1.1.4 255.255.255.0 tag-switching ip serial restart-delay 0 ! interface Serial1/1 ip vrf forwarding eason ip address 192.168.3.1 255.255.255.0 router eigrp 90 network 4.0.0.0 network 34.0.0.0 no auto-summary ! router ospf 1 vrf eason router-id 4.4.4.4 log-adjacency-changes redistribute bgp 1 subnets network 192.168.3.1 0.0.0.0 area 0 ! router bgp 1 no synchronization bgp router-id 4.4.4.4 bgp log-neighbor-changes neighbor 2.2.2.2 remote-as 1 neighbor 2.2.2.2 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 2.2.2.2 activate neighbor 2.2.2.2 send-community both exit-address-family ! address-family ipv4 vrf eason redistribute ospf 1 no auto-summary no synchronization exit-address-family ! address-family ipv4 vrf 7 neighbor 47.1.1.7 remote-as 7 neighbor 47.1.1.7 activate no auto-summary no synchronization exit-address-family R5： interface Loopback0 ip address 192.168.4.1 255.255.255.0 interface Serial1/0 ip address 192.168.3.2 255.255.255.0 router ospf 1 router-id 192.168.4.1 log-adjacency-changes network 192.168.3.2 0.0.0.0 area 0 network 192.168.4.1 0.0.0.0 area 0 R6：

interface Loopback0 ip address 6.6.6.6 255.255.255.0 ! interface FastEthernet0/0 ip address 26.1.1.6 255.255.255.0 router bgp 6 no synchronization bgp router-id 6.6.6.6 bgp log-neighbor-changes network 6.6.6.0 mask 255.255.255.0 neighbor 26.1.1.2 remote-as 1 no auto-summary R7： interface Loopback0 ip address 7.7.7.7 255.255.255.0 ! interface FastEthernet0/0 ip address 47.1.1.7 255.255.255.0 router bgp 7 no synchronization bgp router-id 7.7.7.7 bgp log-neighbor-changes network 7.7.7.0 mask 255.255.255.0 neighbor 47.1.1.4 remote-as 1 no auto-summary 实验结果：

BGP表