在划分的三个区域和主区域中的每台路由器都开启OSPF进程，并指定接口所属区域

网络拓扑图如下：

首先配置路由器的接口IP地址：

[R1]int g0/0/0
[R1-GigabitEthernet0/0/0]ip add 12.0.0.1 8
[R1-GigabitEthernet0/0/0]int g0/0/1
[R1-GigabitEthernet0/0/1]ip add 13.0.0.1 8
[R1-GigabitEthernet0/0/1]quit
[R1]int LoopBack 0
[R1-LoopBack0]ip add 1.0.0.1 8
[R1-LoopBack0]quit
[R1-LoopBack1]ip add 172.16.0.1 24
[R1-LoopBack1]quit

R２、R３同理按照网络拓扑图配置

接着配置各个路由器接口的ｏｓｐｆ：

[R1]ospf
[R1-ospf-1]area 0
[R1-ospf-1-area-0.0.0.0]net 12.0.0.0 0.255.255.255
[R1-ospf-1-area-0.0.0.0]net 13.0.0.0 0.255.255.255
[R1-ospf-1-area-0.0.0.0]quit
[R1-ospf-1]area 1
[R1-ospf-1-area-0.0.0.1]net 172.16.0.1 0.0.0.0
[R1-ospf-1-area-0.0.0.1]net 1.0.0.1 0.0.0.0
[R1-ospf-1-area-0.0.0.1]quit

R２、R３同理按照网络拓扑图配置
查看配置好的ｏｓｐｆ接口：

[R1]dis ospf interface 

	 OSPF Process 1 with Router ID 12.0.0.1
		 Interfaces 

 Area: 0.0.0.0          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 12.0.0.1        Broadcast    DR       1       1     12.0.0.1        12.0.0.2
 13.0.0.1        Broadcast    DR       1       1     13.0.0.1        13.0.0.2
 
 Area: 0.0.0.1          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 1.0.0.1         P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 172.16.0.1      P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 

[R2]dis ospf interface 

	 OSPF Process 1 with Router ID 12.0.0.2
		 Interfaces 

 Area: 0.0.0.0          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 12.0.0.2        Broadcast    BDR      1       1     12.0.0.1        12.0.0.2
 23.0.0.1        Broadcast    DR       1       1     23.0.0.1        23.0.0.2
 
 Area: 0.0.0.2          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 2.0.0.1         P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 10.0.0.1        P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 

[R3]dis ospf interface 

	 OSPF Process 1 with Router ID 13.0.0.2
		 Interfaces 

 Area: 0.0.0.0          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 13.0.0.2        Broadcast    BDR      1       1     13.0.0.1        13.0.0.2
 23.0.0.2        Broadcast    BDR      1       1     23.0.0.1        23.0.0.2
 
 Area: 0.0.0.3          (MPLS TE not enabled)
 IP Address      Type         State    Cost    Pri   DR              BDR 
 3.0.0.1         P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 192.168.0.1     P2P          P-2-P    0       1     0.0.0.0         0.0.0.0
 

最后检查路由表、并测试全网互通。
这里以R１去ｐｉｎｇ通Ｒ３为例“