实验环境:
操作系统:Mac OS X 10.11.4(当时最新正式版),模拟器:GNS3 IOU for Mac 1.4.4(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

实验过程:
完成上述配置后,我们在IOU3上看一下来自IOU5的5.5.5.5的路由:
IOU3#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 a - application route + - replicated route, % - next hop override Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets O IA 1.1.1.1 [110/21] via 23.1.1.2, 00:01:59, Ethernet0/1 2.0.0.0/32 is subnetted, 1 subnets O IA 2.2.2.2 [110/11] via 23.1.1.2, 00:01:59, Ethernet0/1 3.0.0.0/32 is subnetted, 1 subnets C 3.3.3.3 is directly connected, Loopback0 4.0.0.0/32 is subnetted, 1 subnets O IA 4.4.4.4 [110/21] via 35.1.1.5, 00:01:13, Ethernet0/0 5.0.0.0/32 is subnetted, 1 subnets O 5.5.5.5 [110/11] via 35.1.1.5, 00:01:13, Ethernet0/0 —— 这里是O的路由,因为他们同属于area 1 ......
然后我们到IOU3上shutdown掉e 0/0:
IOU3#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 a - application route + - replicated route, % - next hop override Gateway of last resort is not set 1.0.0.0/32 is subnetted, 1 subnets O IA 1.1.1.1 [110/21] via 23.1.1.2, 00:03:45, Ethernet0/1 2.0.0.0/32 is subnetted, 1 subnets O IA 2.2.2.2 [110/11] via 23.1.1.2, 00:03:45, Ethernet0/1 3.0.0.0/32 is subnetted, 1 subnets C 3.3.3.3 is directly connected, Loopback0 4.0.0.0/32 is subnetted, 1 subnets O IA 4.4.4.4 [110/31] via 23.1.1.2, 00:00:20, Ethernet0/1 5.0.0.0/32 is subnetted, 1 subnets O IA 5.5.5.5 [110/41] via 23.1.1.2, 00:00:20, Ethernet0/1 —— 虽然同属于area 1,但是这条路由来自骨干区域area 0,所以是O IA的路由了
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