网络结构如下图所示:
R1基本配置
Router>enable
Router#conf t
Router(config)#host r1
R1(config)#int s2/1
R1(config-if)#ip add 12.1.1 .1 255.255.255.0
R1(config-if)#no shut
R1(config-if)#exit
R1(config)#int f0/0
R1(config)#ip add 172.16.10.1 255.255.255.0
R1(config)#no shut
R2基本配置
Router>enable
Router#conf t
Router(config)#int s2/1
Router(config-if)#ip add 12.1.1 .2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#int f0/0
Router(config-if)#ip add 172.16.20.1 255.255.255.0
Router(config-if)#no shut
配置RIPV1
R1配置rip
R1（config）#router rip
R1（config-route）#net 12.0.0 .0
R1（config-route）#net 172.16.10.0
R2配置rip
R2（config）#router rip
R2（config-route）#net 12.0.0 .0
R2（config-route）#net 172.16.20.0
检测网络
R1#ping 172.16.20.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.20.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/1)
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF , IA
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.10.0 is directly connected, FastEthernet0/0
C 12.1.1 .0 is directly connected, Serial2/1
r2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF , IA
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/24 is subnetted, 1 subnets
C 172.16.20.0 is directly connected, FastEthernet0/0
C 12.1.1 .0 is directly connected, Serial2/1
r2#show ip pro
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 1 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 1, receive any version
Interface Send Recv Triggered RIP Key-chain
FastEthernet0/0 1 1 2
Serial2/1 1 1 2
Automatic network summarization is in effect
Maximum path: 4
Routing for Networks:
172.16.0.0
Routing Information Sources:
Gateway Distance Last Update
Distance: (default is 120)
这就是不连续网络造成的下来我们用不同方法来解决，让它可以ping通。