一、实验拓扑图：

二、PC 设置IP地址、子网掩码及网关：

三、配置三层交换机3SW1：

[3SW1]vlan batch 10 20 		创建vlan10和20
Info: This operation may take a few seconds. Please wait for a moment...done.
[3SW1]port-group group-member g0/0/1 g0/0/2	端口组的成员是g0/0/1和g0/0/2
[3SW1-port-group]port link-type access		端口链路类型为接入
[3SW1-GigabitEthernet0/0/1]port link-type access	
[3SW1-GigabitEthernet0/0/2]port link-type access
[3SW1-port-group]port default vlan 10		端口接入vlan10
[3SW1-GigabitEthernet0/0/1]port default vlan 10
[3SW1-GigabitEthernet0/0/2]port default vlan 10
[3SW1-port-group]quit
[3SW1]interface g0/0/3			进入g0/0/3接口
[3SW1-GigabitEthernet0/0/3]port link-type access	端口链路类型为接入
[3SW1-GigabitEthernet0/0/3]port default vlan 20		端口接入vlan20
[3SW1-GigabitEthernet0/0/3]quit
[3SW1]interface vlanif 10		进入vlan10的虚接口 （三层是虚接口：IP是网关地址）
[3SW1-Vlanif10]ip address 192.168.1.254 24			IP地址192.168.1.254 子网掩码24
[3SW1-Vlanif10]quit
[3SW1]interface vlanif 20		进入vlan20的虚接口
[3SW1-Vlanif20]ip address 192.168.2.254 24			IP地址192.168.2.254 子网掩码24
[3SW1-Vlanif20]quit

四、查看IP接口的详细信息

[3SW1]display ip interface brief 查看IP接口的详细信息
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
The number of interface that is UP in Physical is 3
The number of interface that is DOWN in Physical is 2
The number of interface that is UP in Protocol is 3
The number of interface that is DOWN in Protocol is 2

Interface                         IP Address/Mask      Physical   Protocol  
MEth0/0/1                         unassigned           down       down      
NULL0                             unassigned           up         up(s)     
Vlanif1                           unassigned           down       down      
Vlanif10                          192.168.1.254/24     up         up        看这个，vlan虚接口IP也是网关地址
Vlanif20                          192.168.2.254/24     up         up        看这个，vlan虚接口IP也是网关地址

五、验证三层交换是否全网互通：