一、如图所示新建拓扑图
二、给各个路由器配置本地换回地址,物理端口的IP地址
R1: interface Serial4/0/0
ip address 12.1.1.1 255.255.255.0
interface LoopBack0
ip address 1.1.1.1 0.0.0.0
R2:interface Serial4/0/0
ip address 12.1.1.2 255.255.255.0
interface LookBack0
ip address 2.2.2.2 0.0.0.0
interface g0/0/0
ip address 23.1.1.1 255.255.255.0
R3: interface Serial4/0/0
ip address 34.1.1.1 255.255.255.0
interface G0/0/0
ip address 23.1.1.2 255.255.255.0
interface LookBack0
ip address 3.3.3.3 0.0.0.0(以此类推直至配完)
三、按照接口划分区域以及宣告
R1: ospf1
area 1
network 1.1.1.1 0.0.0.0
network 12.1.1.1 0.0.0.255
R2: ospf1
area 0
network 2.2.2.2 0.0.0.0
network 23…1.1.1 0.0.0.255
q
area 1
network 12.1.1.2 0.0.0.255
network 2.2.2.2 0.0.0.0
四、互相ping通检查是否全网可达