要求：全网互通

[R1]

[R1]INT E0/0/0

[R1-Ethernet0/0/0]ip address 13.1.1.1 24

[R1-Ethernet0/0/0]int e0/0/1

[R1-Ethernet0/0/1]ip address 12.1.1.1 24

[R1-Ethernet0/0/1]q

[R1]ospf 1 router-id 1.1.1.1（ospf的router-id）

[R1-ospf-1]area 0（为骨干区域，创建area 0）

[R1-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255（宣告属于area0区域的接口）

[R1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255

[R2]

[R2]int e0/0/0

[R2-Ethernet0/0/0]ip address 24.1.1.2 24

[R2-Ethernet0/0/0]int e0/0/1

[R2-Ethernet0/0/1]ip address 12.1.1.2 24

[R2-Ethernet0/0/1]q

[R2]ospf 1 router-id 2.2.2.2

[R2-ospf-1]area 0

[R2-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255

[R2-ospf-1-area-0.0.0.0]network 24.1.1.0 0.0.0.255

[R3]

[R3]int e0/0/0

[R3-Ethernet0/0/0]ip address 13.1.1.3 24

[R3-Ethernet0/0/0]int e0/0/1

[R3-Ethernet0/0/1]ip address 34.4.4.3 24

[R3-Ethernet0/0/1]q

[R3]ospf 1 router-id 3.3.3.3

[R3-ospf-1]area 0

[R3-ospf-1-area-0.0.0.0]network 13.1.1.0 0.0.0.255

[R3-ospf-1-area-0.0.0.0]network 34.1.1.0 0.0.0.255

[R4]

[R4]int e0/0/0

[R4-Ethernet0/0/0]ip address 34.1.1.4 24

[R4-Ethernet0/0/0]int e0/0/1

[R4-Ethernet0/0/1]ip address 24.1.1.4 24

[R4-Ethernet0/0/1]q

[R4]ospf 1 router-id 4.4.4.4

[R4-ospf-1]area 0

[R4-ospf-1-area-0.0.0.0]network 34.1.1.0 0.0.0.255

[R4-ospf-1-area-0.0.0.0]network 24.1.1.0 0.0.0.255