使用路由器的Loopback接口地址作为Route ID，R1的Loopback0为1.1.1.1/32，R2的Loopback0为2.2.2.2/32，R3的Loopback0为3.3.3.3/32，R4的Loopback0为4.4.4.4/32.

使用Loopback接口模拟下带主机的地址网段，R1的Loopback1为192.168.1.0/24，R2的Loopback1为192.168.2.0/24，R3的Loopback1为192.168.3.0/24，R4的Loopback1为192.168.4.0/24

R1(config)#interface fastEthernet 0/0

R1(config-if)#ip address 10.0.0.9 255.255.255.252R1(config-if)#no shutdown R1(config-if)#exitR1(config)#interface fastEthernet 1/0R1(config-if)#ip address 10.0.0.5 255.255.255.252R1(config-if)#no shutdown R1(config-if)#exitR1(config)#interface fastEthernet 2/0R1(config-if)#ip address 10.0.0.1 255.255.255.252R1(config-if)#no shutdown R1(config-if)#exitR1(config)#interface loopback 0R1(config-if)#ip address 1.1.1.1 255.255.255.255R1(config-if)#no shutdown R1(config-if)#exitR1(config)#interface loopback 1R1(config-if)#ip address 192.168.1.1 255.255.255.0R1(config-if)#no shutdown R1(config-if)#exitR2(config)#interface fastEthernet 0/0R2(config-if)#ip address 10.0.0.2 255.255.255.252R2(config-if)#no shutdown R2(config-if)#exitR2(config)#interface loopback 0R2(config-if)#ip address 2.2.2.2 255.255.255.255R2(config-if)#no shutdown R2(config-if)#exitR2(config)#interface loopback 1R2(config-if)#ip address 192.168.2.1 255.255.255.0R2(config-if)#no shutdown R2(config-if)#exitR3(config)#interface fastEthernet 0/0R3(config-if)#ip address 10.0.0.6 255.255.255.252R3(config-if)#no shutdown R3(config-if)#exitR3(config)#interface loopback 0R3(config-if)#ip address 3.3.3.3 255.255.255.255R3(config-if)#no shutdown R3(config-if)#exitR3(config)#interface loopback 1R3(config-if)#ip address 192.168.3.1 255.255.255.0R3(config-if)#no shutdown R3(config-if)#exitR4(config)#interface fastEthernet 0/0R4(config-if)#ip address 10.0.0.10 255.255.255.252R4(config-if)#no shutdown R4(config-if)#exitR4(config)#interface loopback 0R4(config-if)#ip address 4.4.4.4 255.255.255.255R4(config-if)#no shutdown R4(config-if)#exitR4(config)#interface loopback 1R4(config-if)#ip address 192.168.4.1 255.255.255.0R4(config-if)#no shutdown R4(config-if)#exitR3(config)#router ospf 1R3(config-router)#router-id 3.3.3.3R3(config-router)#network 3.3.3.3 0.0.0.0 area 0R3(config-router)#network 10.0.0.6 0.0.0.0 area 0R3(config-router)#network 192.168.3.0 0.0.0.255 area 0R3(config-router)#exitR2(config)#router ospf 1R2(config-router)#router-id 2.2.2.2R2(config-router)#network 2.2.2.2 0.0.0.0 area 1R2(config-router)#network 10.0.0.2 0.0.0.3 area 1R2(config-router)#network 192.168.2.0 0.0.0.255 area 1R2(config-router)#exitR4(config)#router ospf 1R4(config-router)#router-id 4.4.4.4R4(config-router)#network 4.4.4.4 0.0.0.0 area 2R4(config-router)#network 10.0.0.10 0.0.0.0 area 2R4(config-router)#network 192.168.4.0 0.0.0.3 area 2R4(config-router)#area 2 stubR4(config-router)#exitR4(config)#ip route 0.0.0.0 0.0.0.0 10.0.0.9R1(config)#router ospf 1R1(config-router)#router-id 1.1.1.1R1(config-router)#network 10.0.0.1 0.0.0.0 area 1 R1(config-router)#network 10.0.0.5 0.0.0.0 area 0R1(config-router)#network 10.0.0.9 0.0.0.0 area 2R1(config-router)#network 192.168.1.0 0.0.0.255 area 0R1(config-router)#exitR1(config)#do show ip route      1.0.0.0/32 is subnetted, 1 subnetsC       1.1.1.1 is directly connected, Loopback0     2.0.0.0/32 is subnetted, 1 subnetsO       2.2.2.2 [110/2] via 10.0.0.2, 00:03:25, FastEthernet2/0     3.0.0.0/32 is subnetted, 1 subnetsO       3.3.3.3 [110/2] via 10.0.0.6, 00:01:22, FastEthernet1/0     4.0.0.0/32 is subnetted, 1 subnetsO       4.4.4.4 [110/2] via 10.0.0.10, 00:00:41, FastEthernet0/0     192.168.4.0/32 is subnetted, 1 subnetsO       192.168.4.1 [110/2] via 10.0.0.10, 00:00:41, FastEthernet0/0     10.0.0.0/30 is subnetted, 3 subnetsC       10.0.0.8 is directly connected, FastEthernet0/0C       10.0.0.0 is directly connected, FastEthernet2/0C       10.0.0.4 is directly connected, FastEthernet1/0C    192.168.1.0/24 is directly connected, Loopback1     192.168.2.0/32 is subnetted, 1 subnetsO       192.168.2.1 [110/2] via 10.0.0.2, 00:03:27, FastEthernet2/0     192.168.3.0/32 is subnetted, 1 subnetsO       192.168.3.1 [110/2] via 10.0.0.6, 00:01:24, FastEthernet1/0R1(config)#do ping 192.168.2.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 192.168.2.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 32/45/60 ms