一、单臂路由
1.Switch与Router间链路要配成trunk
2.Router主接口f0/0不配IP，要no shut
3.子接口(即PC网关)配置：int f0/0.2
4.接口封装，对应VLAN2：encapsulation dot1q 2
5.子接口配置IP:ip addr 192.168.2.254 255.255.255.0
二、三层交换
1.开启三层交换机路由function：ip routing
2.选择端口：int f0/1
3.封装：swi trunk encapsulation dot1q
4.配置为trunk：swi mode trunk
5.SVI接口(即PC网关)：int vlan 2
6.给SVI接口配IP:ip addr 192.168.2.254 255.255.255.0
三、VLAN负载均衡
1.两台交换机SW1、SW2间链路配置为trunk:swi mode trunk
2.配置快速STP:spanning-tree mode rapid-pvst
3.配置根桥负载均衡：
SW1:spanning-tree vlan 1 root primary
SW1:spanning-tree vlan 2 root secondary
SW2:spanning-tree vlan 1 root secondary
SW2:spanning-tree vlan 2 root primary
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