实验目的：简单小型网络的单臂路由配置方法。

实验拓扑：小型局域网，由二层交换机连接三个不同VLAN网段，通过一台路由器上网。

实验配置：

PC配置 192.168.1-3.1/24/192.168.1-3.254

交换机配置：

sysname SW

VLAN 10 20 30

interface GigabitEthernet1/0/2

port link-type trunk

port trunk permit vlan all

//上联端口配置为TRUNK，放行所有VLAN

interface GigabitEthernet1/0/3

port access vlan 10

interface GigabitEthernet1/0/4

port access vlan 20

interface GigabitEthernet1/0/4

port access vlan 30

路由器配置

sysname R1

interface LoopBack0

ip address 1.1.1.1 255.255.255.255

//配置环回口模拟外网

interface GigabitEthernet0/2.10

ip address 192.168.1.254 255.255.255.0

vlan-type dot1q vid 10

vlan-termination broadcast enable

interface GigabitEthernet0/2.20

ip address 192.168.2.254 255.255.255.0

vlan-type dot1q vid 20

vlan-termination broadcast enable

interface GigabitEthernet0/2.30

ip address 192.168.3.254 255.255.255.0

vlan-type dot1q vid 30

vlan-termination broadcast enable

//配置子接口，终结对应VLAN

配置完成后，查看路由器路由表正常

PC之间、PC与外网互通访问正常