本次主要讲解的是二层交换机中vlan的划分，讲解如下：
配置模型图
命令行讲解：
Switch>
Switch>enable
Switch#
Switch#vlan database //进入vlan配置模式
% Warning: It is recommended to configure VLAN from config mode, as VLAN database mode is being deprecated. Please consult user documentation for configuring VTP/VLAN in config mode.
Switch(vlan)#vlan 2 name TztA //划分vlan 2 名字为TztA VLAN 2 added:
Name: TztA //显示已划分的vlan名
Switch(vlan)#vlan 3 name TztB //划分vlan 3 名字为TztB
VLAN 3 added:
Name: TztB //显示已划分的vlan名
Switch(vlan)#exit //推出vlan配置
APPLY completed.
Exiting....
Switch#wr //保存已有配置（此处为write的缩写）
Building configuration...
[OK] //提示已保存成功
Switch#config t
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#interface f0/1 //进入端口f0/1
Switch(config-if)#switchport mode access //将端口f0/1设置为静态VLAN模式Switch(config-if)#switchport access vlan 2 //将将端口f0/1分配给VLAN2
Switch(config-if)#exit
Switch(config)#int f0/1
Switch(config-if)#exit
Switch(config)#int f0/2
Switch(config-if)#switchport mode access //将端口f0/2设置为静态VLAN模式
Switch(config-if)#switchport access vlan 2 //将将端口f0/2分配给VLAN2
Switch(config-if)#exit
Switch(config)#int f0/3
Switch(config-if)#sw mo ac //将端口f0/3设置为静态VLAN模式（此处为命令行缩写模式）Switch(config-if)#sw ac vlan 3 //将将端口f0/3分配给VLAN2
Switch(config-if)#exit
Switch(config)#int f0/4
Switch(config-if)#sw mo ac //将端口f0/4设置为静态VLAN模式
Switch(config-if)#sw ac vlan 3 //将将端口f0/4分配给VLAN2
Switch(config-if)#exit
Switch(config)#exit
%SYS-5-CONFIG_I: Configured from console by console
Switch#wr
Building configuration...
[OK] //提示已保存成功
Switch#show vlan //显示所有vlan信息，如下：
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
Gig1/1, Gig1/2
2 TztA active Fa0/1, Fa0/2 //此处为已配置的vlan
2信息
3 TztB active Fa0/3, Fa0/
4 //此处为已配置的vlan 3
信息
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
