一、拓扑
二、配置
1. 按照上图所示配置IP地址以及通告网络
邻居都可以正常建立，但在R2上看路由
R2#show ip route
Codes: 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
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65] via 12.1.1.1, 00:03:47, Serial0/0
23.0.0.0/24 is subnetted, 1 subnets
C 23.1.1.0 is directly connected, Serial0/1
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, Serial0/0
在区域1 上的路由器上看，其路由表没有未直接连接的区域0一边的路由
2. 在不连续的区域0穿越的区域之间的ABR上配置虚链路。
R2 的路由进程里面配置Area 1 vitrual-link 3.3.3.3
R3的路由进程里面配置Area 1 vitrual-link 2.2.2.2
R2#show ip ospf interface
OSPF_VL0 is up, line protocol is up
Internet Address 23.1.1.2/24, Area 0
Process ID 110, Router ID 2.2.2.2, Network Type VIRTUAL_LINK, Cost: 64
Configured as demand circuit.
Run as demand circuit.
DoNotAge LSA allowed.
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:08
Supports Link-local Signaling (LLS)
Index 2/3, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3 (Hello suppressed)
Suppress hello for 1 neighbor(s)