实验环境：
操作系统：Mac OS X 10.11.5 Beta 1（当时最新测试版），模拟器：GNS3 IOU for Mac 1.4.5（当时最新版本）
注：当然，只要有思科模拟器都可以做这个实验
实验需求：
site 1 和 site 2 均需要开启 OSPF ，实现 R1 到 R5 的内网通信。
实验步骤：（基础配置）
| R1 ：
interface Loopback0 interface FastEthernet1/0 router ospf 12 |
R3 ：
interface FastEthernet1/0 interface FastEthernet1/1 |
R5 ：
interface Loopback0 interface FastEthernet1/1 router ospf 45 |
| R2 ：
interface Loopback0 interface FastEthernet1/0 interface FastEthernet1/1 ip route 0.0.0.0 0.0.0.0 23.1.1.3 router ospf 12 |
R4 ：
interface Loopback0 interface FastEthernet1/0 interface FastEthernet1/1 ip route 0.0.0.0 0.0.0.0 34.1.1.3 router ospf 45 |
GRE 的配置：
R2 ：
R2(config)#int tunnel 0
R2(config-if)#tunnel source f 1/1
R2(config-if)#tunnel destination 34.1.1.4 —— tunnel mode 默认就是 gre ，可以不
配置 tunnel mode gre 这条命令
R2(config-if)#ip add 24.1.1.2 255.255.255.0
R2(config-if)#ip ospf 12 a 0
R4 ：
R4(config)#int tunnel 0 R4(config-if)#tunnel source f 1/0 R4(config-if)#tunnel destination 23.1.1.2 R4(config-if)#ip add 24.1.1.4 255.255.255.0 R4(config-if)#ip ospf 45 a 0
测试：
R2#sh ip ro Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2 i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, * - candidate default, U - per-user static route o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP + - replicated route, % - next hop override Gateway of last resort is 23.1.1.3 to network 0.0.0.0 S* 0.0.0.0/0 [1/0] via 23.1.1.3 1.0.0.0/32 is subnetted, 1 subnets O 1.1.1.1 [110/2] via 12.1.1.1, 00:20:54, FastEthernet1/0 2.0.0.0/32 is subnetted, 1 subnets C 2.2.2.2 is directly connected, Loopback0 4.0.0.0/32 is subnetted, 1 subnets O 4.4.4.4 [110/1001] via 24.1.1.4, 00:01:21, Tunnel0 5.0.0.0/32 is subnetted, 1 subnets O 5.5.5.5 [110/1002] via 24.1.1.4, 00:01:21, Tunnel0 —— 直接就能学到 R5 的路由 12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 12.1.1.0/24 is directly connected, FastEthernet1/0 L 12.1.1.2/32 is directly connected, FastEthernet1/0 23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 23.1.1.0/24 is directly connected, FastEthernet1/1 L 23.1.1.2/32 is directly connected, FastEthernet1/1 24.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 24.1.1.0/24 is directly connected, Tunnel0 L 24.1.1.2/32 is directly connected, Tunnel0 45.0.0.0/24 is subnetted, 1 subnets O 45.1.1.0 [110/1001] via 24.1.1.4, 00:01:21, Tunnel0
R1#p 5.5.5.5 so l 0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 5.5.5.5, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 52/65/72 ms
本文完。如有疑问，欢迎在下方留言；如本文有什么错误，欢迎在下方留言指正，谢谢。
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