1.拓扑结构

2.使用OSPF配置一个IPP环境

[R2]ospf 1 router-id 172.16.1.2

[R2-ospf-1]area 0

[R2-ospf-1-area-0.0.0.0]network 172.16.0.0 0.0.255.255

更改逆接口网络类型

[R2]interface LoopBack 1

[R2-LoopBack1]ospf network-type broadcast

3.配置MPLS环境

[R2]mpls lsr-id 172.16.1.2

[R2]mpls

[R2-mpls]mpls ldp

[R2-mpls-ldp]q

[R2]interface GigabitEthernet 0/0/1

[R2-GigabitEthernet0/0/1]mpls

[R2-GigabitEthernet0/0/1]mpls ldp

[R2-GigabitEthernet0/0/1]q

[R2]interface GigabitEthernet 0/0/2

[R2-GigabitEthernet0/0/2]mpls

[R2-GigabitEthernet0/0/2]mpls ldp

[R2-GigabitEthernet0/0/2]q

4.配置BGP环境

在R1、R2、R5、R7、R8上配置BGP,并在R1和R8上宣布用户循环

此时,创建了BGP路由黑洞,因此R1到R7不可用,可以通过以下命令配置在AS2上解决这个问题

[R2]route recursive-lookup tunnel

在R2、R5、R7上放置一个空接口

[R2]ip route-static 172.16.0.0 21 NULL 0

[R2]bgp 2

[R2-bgp]network 172.16.0.0 21

在非BGP上配置缺失路径

[R3]ip route-static 0.0.0.0 0 172.16.1.2

[R4]ip route-static 0.0.0.0 0 172.16.1.7

[R6]ip route-static 0.0.0.0 0 172.16.1.5

5.干涉选路

[R2]ip ip-prefix a permit 172.16.2.0 24

[R2]route-policy a permit node 10

[R2-route-policy]if-match ip-prefix a

[R2-route-policy]apply cost 1

[R2-route-policy]q

[R2]route-policy a permit node 20

Info: New Sequence of this List.

[R2-route-policy]q

[R2]bgp 2

[R2-bgp]peer 12.1.1.1 route-policy a export

6.测试

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