双臂路由；三个的是access口（路由器不用配置，记得接口）
单臂路由：连接路由器接口配置trunk链路，路由器的接口分成俩个子接口
三层交换：相当于双臂路由的路由器加交换机，只要在vlanif接口上面配置ip就行
|---|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| | | | |
| | SW1: interface GigabitEthernet0/0/1 port link-type access port default vlan 10 interface GigabitEthernet0/0/2 port link-type access port default vlan 20 interface GigabitEthernet0/0/3 port link-type access port default vlan 10 interface GigabitEthernet0/0/4 port link-type access port default vlan 20 | | |
| | SW1: interface GigabitEthernet0/0/1 port link-type access port default vlan 10 interface GigabitEthernet0/0/2 port link-type access port default vlan 20 interface GigabitEthernet0/0/3 port link-type access port default vlan 10 interface GigabitEthernet0/0/4 port link-type access port default vlan 20 | | SW2: interface GigabitEthernet0/0/0.30 dot1q termination vid 30 ip address 192.168.30.254 255.255.255.0 arp broadcast enable interface GigabitEthernet0/0/0.40 dot1q termination vid 40 ip address 192.168.40.254 255.255.255.0 arp broadcast enable |
| | SW1: interface GigabitEthernet0/0/1 port link-type access port default vlan 10 interface GigabitEthernet0/0/2 port link-type access port default vlan 20 interface GigabitEthernet0/0/3 port link-type access port default vlan 10 interface GigabitEthernet0/0/4 port link-type access port default vlan 20 | | |
SW3:
interface Vlanif1
ip address 10.0.23.3 255.255.255.0