配置如下：
[R1]int s0/2/0
[R1-Serial0/2/0]ip add 10.1.12.1 30
[R1-Serial0/2/0]int lo0
[R1-LoopBack0]ip add 1.1.1.1 32
[R1-LoopBack0]int lo1
[R1-LoopBack1]ip add 192.168.1.100 32
[R1-LoopBack1]int lo2
[R1-LoopBack2]ip add 192.168.2.100 32
[R1-LoopBack2]int lo3
[R1-LoopBack3]ip add 192.168.3.100 32
[R1]rip
[R1-rip-1]ver 2
[R1-rip-1]undo sum
[R1-rip-1]net 10.1.12.0
[R1-rip-1]net 192.168.1.100
[R1-rip-1]net 192.168.2.100
[R1-rip-1]net 192.168.3.100
[R1-rip-1]net 1.1.1.1
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[R2]int s0/2/0
[R2-Serial0/2/0]ip add 10.1.12.2 30
[R2-Serial0/2/0]int s0/2/1
[R2-Serial0/2/1]ip add 10.1.23.1 30
[R2-Serial0/2/1]int lo0
[R2-LoopBack0]ip add 2.2.2.2 32
[R2]rip
[R2-rip-1]ver 2
[R2-rip-1]undo sum
[R2-rip-1]net 2.2.2.2
[R2-rip-1]net 10.1.12.0
[R2]ospf 1
[R2-ospf-1]area 0
[R2-ospf-1-area-0.0.0.0]net 10.1.23.0 0.0.0.3
[R2-ospf-1-area-0.0.0.0]net 2.2.2.2 0.0.0.0
[R2]rip
[R2-rip-1]import-route ospf
[R2]ospf
[R2-ospf-1]import-route rip
[R2-ospf-1]import-route direct
[R2]ip ip-prefix 1234 deny 192.168.3.100 32
[R2]ip ip-prefix 1234 permit 0.0.0.0 0 less-equal 32
[R2]rip
[R2-rip-1]filter-policy ip-prefix 1234 import
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[R3]int s0/2/0
[R3-Serial0/2/0]ip add 10.1.23.2 30
[R3-Serial0/2/0]int s0/2/1
[R3-Serial0/2/1]ip add 10.1.34.1 30
[R3-Serial0/2/1]int lo0
[R3-LoopBack0]ip add 3.3.3.3 32
[R3]ospf 1
[R3-ospf-1]area 0
[R3-ospf-1-area-0.0.0.0]net 10.1.23.0 0.0.0.3
[R3]isis 1
[R3-isis-1]network-entity 10.0000.0000.0003.00
[R3-isis-1]int s0/2/1
[R3-Serial0/2/1]isis enable 1
[R3]int lo0
[R3-LoopBack0]isis enable 1
[R3]ospf
[R3-ospf-1]import-route isis
[R3]isis
[R3-isis-1]import-route ospf
[R3]ospf
[R3-ospf-1]import-route direct
[R3]ip ip-prefix 1234 deny 192.168.2.100 32
[R3]ip ip-prefix 1234 deny 192.168.3.100 32
[R3]ip ip-prefix 1234 permit 0.0.0.0 0 less-equal 32
[[R3]isis
[R3-isis-1]filter-policy ip-prefix 1234 export
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[R4]int s0/2/0
[R4-Serial0/2/0]ip add 10.1.24.2 30
[R4-Serial0/2/0]int lo0
[R4-LoopBack0]ip add 4.4.4.4 32
[R4-LoopBack0]int lo1
[R4-LoopBack1]ip add 172.16.1.100 32
[R4-LoopBack1]int lo2
[R4-LoopBack2]ip add 172.17.1.10032
[R4-LoopBack2]int lo3
[R4-LoopBack3]ip add 172.18.1.100 32
[R4]isis 1
[R4-isis-1]network-entity 10.0000.0000.0004.00
[R4-isis-1]int s0/2/0
[R4-Serial0/2/0]isis enable 1
[R4-Serial0/2/0]int lo0
[R4-LoopBack0]isis enable
[R4-LoopBack0]int lo1
[R4-LoopBack1]isi enable
[R4-LoopBack1]int lo2
[R4-LoopBack2]isi enable
[R4-LoopBack2]int lo3
[R4-LoopBack3]isis enable