P 10.1.2.0/30, 1 successors, FD is 128256
via Connected, Loopback2
P 10.1.1.0/30, 1 successors, FD is 40640000
via 192.168.0.1 (40640000/128256), Serial2/1
via 23.0.0.3 (40642560/40130560), Serial2/2
P 10.1.3.4/30, 1 successors, FD is 40640000
via 23.0.0.3 (40640000/128256), Serial2/2
via 192.168.0.1 (40642560/40130560), Serial2/1
P 10.1.2.4/30, 1 successors, FD is 128256
via Connected, Loopback3
P 10.1.1.4/30, 1 successors, FD is 40640000
via 192.168.0.1 (40640000/128256), Serial2/1
via 23.0.0.3 (40642560/40130560), Serial2/2
P 23.0.0.0/24, 1 successors, FD is 40512000
via Connected, Serial2/2
P 192.168.0.0/24, 1 successors, FD is 40512000
via Connected, Serial2/1
P 172.16.0.0/24, 2 successors, FD is 40514560
via 192.168.0.1 (40514560/40002560), Serial2/1
via 23.0.0.3 (40514560/40002560), Serial2/2
查看R3的路由表
R3#show ip route
1.0.0.0/24 is subnetted, 1 subnets
D 1.1.1.0 [90/40130560] via 172.16.0.1, 00:50:48, FastEthernet0/0 2.0.0.0/24 is subnetted, 1 subnets
D 2.2.2.0 [90/40640000] via 23.0.0.2, 00:50:48, Serial2/1
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/1
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.0.0 is directly connected, FastEthernet0/0
10.0.0.0/30 is subnetted, 9 subnets
C 10.1.3.8 is directly connected, Loopback4
D 10.1.2.8 [90/40640000] via 23.0.0.2, 00:50:48, Serial2/1
D 10.1.1.8 [90/40130560] via 172.16.0.1, 00:50:48, FastEthernet0/0
C 10.1.3.0 is directly connected, Loopback2
D 10.1.2.0 [90/40640000] via 23.0.0.2, 00:50:48, Serial2/1
D 10.1.1.0 [90/40130560] via 172.16.0.1, 00:50:48, FastEthernet0/0
C 10.1.3.4 is directly connected, Loopback3
D 10.1.2.4 [90/40640000] via 23.0.0.2, 00:50:48, Serial2/1