ospf鏈路狀態路由協議示意圖：
R1配置：
hostname R1
interface Loopback0
ip address 192.168.1.1 255.255.255.0
interface Loopback1
ip address 1.1.1.1 255.255.255.0
interface FastEthernet0/0
ip address 12.1.1.1 255.255.255.0
ip nat inside
interface FastEthernet1/0
ip address 59.56.61.1 255.255.255.0
ip nat outside
interface FastEthernet2/0
ip address 13.1.1.1 255.255.255.0
router ospf 110
router-id 1.1.1.1
network 1.1.1.0 0.0.0.255 area 0
network 12.1.1.0 0.0.0.255 area 0
network 13.1.1.0 0.0.0.255 area 1
network 192.168.1.0 0.0.0.255 area 1
default-information originate metric 10
ip route 0.0.0.0 0.0.0.0 59.56.61.6
ip nat inside source list 1 interface FastEthernet1/0 overload
access-list 1 permit 192.168.2.0 0.0.0.255
R2配置：
hostname R2
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
interface FastEthernet1/0
ip address 25.1.1.2 255.255.255.0
router ospf 110
router-id 2.2.2.2
redistribute rip metric 10 subnets
network 12.1.1.0 0.0.0.255 area 0
router rip
version 2
redistribute ospf 110 metric 3
network 25.0.0.0
no auto-summary
R3配置：
hostname R3
interface FastEthernet0/0
ip address 13.1.1.3 255.255.255.0
interface FastEthernet1/0
ip address 34.1.1.3 255.255.255.0
router ospf 110
router-id 3.3.3.3
redistribute connected subnets
redistribute static metric 200 subnets
network 13.1.1.0 0.0.0.255 area 1
ip route 192.168.3.0 255.255.255.0 34.1.1.4
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