一、配置基本拓扑结构

一台主路由器、二台交换机、二台测试路由器，测试路由器充当电脑使用

二、配置接口IP地址

R1的接口：[R1-GigabitEthernet0/0/1] ip address 10.0.2.2 255.255.255.0 

R2的接口：[R2-GigabitEthernet0/0/2]ip address 10.0.3.2 255.255.255.0

R3的接口：interface GigabitEthernet0/0/1

                             ip address 10.0.2.1 255.255.255.0 

                 interface GigabitEthernet0/0/2

                             ip address 10.0.3.1 255.255.255.0 

三、关闭S2的G0/0/4接口并S1、S2的G0/0/09接口加入VLAN3

[S2]interface GigabitEthernet 0/0/4 

[S2-GigabitEthernet0/0/4]shutdown 

[S2]interface GigabitEthernet 0/0/9 

[S2-GigabitEthernet0/0/9]port link-type access 

[S2-GigabitEthernet0/0/9]port default vlan 3 

[S1]interface GigabitEthernet 0/0/9 

[S1-GigabitEthernet0/0/9]port link-type access 

[S1-GigabitEthernet0/0/9]port default vlan 3 

四、将S1的G0/0/4接口改成TRUNK模式，允许通过VLAN2、VLAN3

[S1]interface GigabitEthernet 0/0/4 

[S1-GigabitEthernet0/0/4]port default vlan 1 

[S1-GigabitEthernet0/0/4]port link-type trunk 

[S1-GigabitEthernet0/0/4]port trunk allow-pass vlan 2 3 

五、在R3上的G0/0/1接口上配置子接口，同时在子接口配置ip地址，把接口配置成Dot1q,终结以太网接子接口

[R4]inter GigabitEthernet 0/0/1.2 

[R4-GigabitEthernet0/0/1.2]control-vid 20 dot1q-termination 

[R4-GigabitEthernet0/0/1.2]dot1q termination vid 2 

[R4-GigabitEthernet0/0/1.2]arp broadcast enable 

[R4-GigabitEthernet0/0/1.2]ip address 10.0.20.1 24 

[R4-GigabitEthernet0/0/1.2]inter GigabitEthernet 0/0/1.3 

[R4-GigabitEthernet0/0/1.3]control-vid 30 dot1q-termination 

[R4-GigabitEthernet0/0/1.3]dot1q termination vid 3 

[R4-GigabitEthernet0/0/1.3]arp broadcast enable 

[R4-GigabitEthernet0/0/1.3]ip address 10.0.30.1 24

六、更改R1、R2的IP地址和网关

[R1]inter GigabitEthernet 0/0/1 

[R1-GigabitEthernet0/0/1]ip address 10.0.20.2 24 

[R1-GigabitEthernet0/0/1]quit 

[R1]undo ip route-static 0.0.0.0 0 10.0.2.1 

[R1]ip route-static 0.0.0.0 0 10.0.20.1 

[R2]interface GigabitEthernet 0/0/2 

[R2-GigabitEthernet0/0/2]ip address 10.0.30.2 24 

[R2-GigabitEthernet0/0/2]quit 

[R2]undo ip route-static 0.0.0.0 0 10.0.3.1 

[R2]ip route-static 0.0.0.0 0 10.0.30.1

七、验证实验结果

[R1]ping -c 1 10.0.30.2 

PING 10.0.30.2: 56 data bytes, press CTRL_C to break 

Reply from 10.0.30.2: bytes=56 Sequence=1 ttl=254 time=3 ms 

--- 10.0.30.2 ping statistics --- 

1 packet(s) transmitted 

1 packet(s) received 

0.00% packet loss 

round-trip min/avg/max = 3/3/3 ms