实验具体步骤如下：
[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]ip add 12.1.1.1 24
[r1-GigabitEthernet0/0/0]int loopback 0
[r1-LoopBack0]ip add 1.1.1.1 24
[r1-LoopBack0]int g0/0/1
[r1-GigabitEthernet0/0/1]ip add 14.1.1.2 24
[r1] rip 1
[r1-rip-1]verfity-sorce
[r1-rip-1]verify-source
[r1-rip-1]version 2
[r1-rip-1]un summary
[r1-rip-1]network 1.0.0.0
[r1-rip-1]network 12.0.0.0
[r1-rip-1]network 14.0.0.0
--------------------------------------
[r2]rip 1
[r2-rip-1]verify-source
[r2-rip-1]version 2
[r2-rip-1]un summary
[r2-rip-1]network 2.0.0.0
[r2-rip-1]network 12.0.0.0
[r2-rip-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 23.1.1.1 0.0.0.0
[r2]rip 1
[r2-rip-1]import-route ospf 1
[r2-rip-1]q
[r2]ospf 1
[r2-ospf-1]import-route rip
[r2-ospf-1]
--------------------------------------
[r3]ospf 1 router-id 3.3.3.3
[r3-ospf-1]area 0
[r3-ospf-1-area-0.0.0.0]network 23.1.1.2 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[r3-ospf-1-area-0.0.0.0]network 34.1.1.1 0.0.0.0
--------------------------------------
[r4]ospf 1 router-id 4.4.4.4
[r4-ospf-1]area 0
[r4-ospf-1-area-0.0.0.0]network 34.1.1.2 0.0.0.0
[r4-ospf-1-area-0.0.0.0]network 4.4.4.4 0.0.0.0
[r4-ospf-1-area-0.0.0.0]q
[r4-ospf-1]rip 1
[r4-rip-1]verify-source
[r4-rip-1]version 2
[r4-rip-1]un summary
[r4-rip-1]network 14.0.0.0
[r4]ospf 1
[r4-ospf-1]import-route rip
[r4-ospf-1]q
[r4]rip 1
[r4-rip-1]import-route ospf 1
[r4-rip-1]
-----------------------实验未完成，待续更新--------------------