1.搭建拓扑 

 2.配置IP

R14：

[r14]ip route-static 0.0.0.0 0 145.1.1.2

[r14]acl 2000
[r14-acl-basic-2000]rule permit source any  
[r14]int GigabitEthernet 0/0/1
[r14-GigabitEthernet0/0/1]nat  outbound 2000

[r14]int Tunnel 0/0/0  
[r14-Tunnel0/0/0]ip address 10.1.1.1 24 
[r14-Tunnel0/0/0]tunnel-protocol gre 
[r14-Tunnel0/0/0]source 145.1.1.1
[r14-Tunnel0/0/0]destination 115.1.1.1

[r14]ospf 1 router-id 14.14.14.14

[r14-ospf-1]area 0   
[r14-ospf-1-area-0.0.0.0]network 135.1.1.0 0.0.0.255

[r14-ospf-1-area-0.0.0.0]network 14.14.14.14 0.0.0.0

[r14-ospf-1-area-0.0.0.0]network 10.1.1.1 0.0.0.0

[r14-ospf-1]default-route-advertise always 

R2：

[r2-ospf-100-area-0.0.0.0]display this 
[V200R003C00]

 area 0.0.0.0 
  network 2.2.2.2 0.0.0.0 
  network 11.1.1.0 0.0.0.255 
  network 12.1.1.2 0.0.0.0 

return

[r2-Tunnel0/0/0]display this 
[V200R003C00]

interface Tunnel0/0/0
 ip address 11.1.1.1 255.255.255.0 
 tunnel-protocol gre p2mp
 source 20.1.1.1
 ospf network-type broadcast
 nhrp entry multicast dynamic
 nhrp network-id 100

实验结果测试：​​​​​​​

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