操作步驟：

1、 配置各接口的IP地址

R3：

[R3]int g0/0/1

[R3-GigabitEthernet0/0/1]ip add 192.168.10.2 24

#

R2：

interface GigabitEthernet0/0/0

ip address 172.40.0.2 255.255.255.0

#

interface GigabitEthernet0/0/1

ip address 192.168.10.2 255.255.255.0

#

interface GigabitEthernet0/0/2

ip address 192.168.20.1 255.255.255.0

#

R4：

[R4]int g0/0/2

[R4-GigabitEthernet0/0/2]ip add 192.168.20.2 24

R1：

[R1]int g0/0/0

[R1-GigabitEthernet0/0/0]ip add 172.40.0.1 24

2、 配置RIP基本功能及版本

[R1]rip

[R1-rip-1]version 2

[R1-rip-1]network 172.40.0.0

[R3]rip

[R3-rip-1]version 2

[R3-rip-1]network 192.168.10.0

[R2]rip

[R2-rip-1]version 2

[R2-rip-1]network 192.168.10.0

[R2-rip-1]network 192.168.20.0

[R2-rip-1]network 172.40.0.0

[R4]rip

[R4-rip-1]version 2

[R4-rip-1]network 192.168.20.0