一、 VLAN划分
以特权模式身份（即看提示符为#：这样）通过串口的终端方式连接交换机，按照下列方式操作：
1．进入配置状态，f和t之间有一空格
#：conf t
2．输入：vlan database
3．输入VLAN号码和名称，如：vlan 10 name test
假定你打算分5个VLAN，就需要输入5次上面的语句，输完后输入apply写入。
#：vlan 10 name test1
#：apply
#：vlan 20 name test2
#：apply
#：vlan 30 name test3
#：apply
#：vlan 40 name test4
#：apply
#：vlan 50 name test5
#：apply
附：如果想删除某个VLAN，比如删除上面的vlan50，输入no vlan 50即可
4．完成VLAN输入后，输入EXIT退出配置状态，在#状态下输入wr保存
#：wr
现在你可以用sh vlan命令，看一下你刚划分的VLAN。
至此VLAN划分完了，下一步是把交换机上的端口指定给某个VLAN。
二、 VLAN端口配置
1．同样进入配置状态，f和t之间有一空格
#：conf t
2．进入某端口命令
#：interface fastethernet 0/3 (进入交换要第3个端口，可简写为：int fast 0/10)
#：switchport access vlan 10 (将此端口分配给vlan10)
#：no shutdown (激活此端口，可简写为：no shut)
#：exit (退出conf t模式)
#：wr (保存上面配置)
3．如果你想将其它端口分配给某个VLAN，重复上在步骤
OK，现在继续下一步给VLAN分配一个IP地址。
三、 给VLAN分配IP地址
每个VLAN的IP地址以后就是这个VLAN网段下面机器的网关地址。
1．还是进入配置状态，f和t之间有一空格
#：conf t
2．进入VLAN接口
#：int vlan10 (进入VLAN10，int是interface简写了)
#：ip address 192.168.0.10 255.255.255.0 (addresss可简写为add，给vlan10分配的ip和掩码)
#：no shut （激活）
#：exit
#：wr
如果有多个VLAN，重复上面步骤
四、 路由配置
#：ip classless
#：ip route 0.0.0.0 0.0.0.0 192.168.0.1 (上层网关地址)
五、生成树拓扑
如果3550下在还接其它交换机，需要把3550设置根交换机，以便生成树拓扑。
生成树拓扑命令：
1．进入配置状态，f和t之间有一空格
#：conf t
#：spanning-tree vlan 10 root primary
如果有多个vlan，每个VLAN都要输入此命令，把VLAN号改一下即可。
五、 如果每个VLAN相互通信，需要输入：
1．进入配置状态，f和t之间有一空格
#：conf t
#：ip routing
#：exit
#：wr
ok，至此，你已经完成3550交换机配置。
------------------------------
附一个完整的3550交换机配置文件：
Using 3472 out of 393216 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname c3550
!
enable secret 5 $1$EYhz$x48Na6Imhow07zQL0GMMc1
enable password 123456
!
ip subnet-zero
ip routing
!
!
!
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree vlan 10 priority 24576
spanning-tree vlan 20 priority 24576
spanning-tree vlan 30 priority 24576
spanning-tree vlan 40 priority 24576
spanning-tree vlan 50 priority 24576
spanning-tree vlan 60 priority 24576
spanning-tree vlan 100 priority 24576
!
!
!
interface FastEthernet0/1
switchport access vlan 100
switchport mode access
no ip address
!
interface FastEthernet0/2
switchport access vlan 100
switchport mode access
no ip address
!
interface FastEthernet0/3
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/4
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/5
switchport access vlan 10
switchport mode access
no ip address
!
interface FastEthernet0/6
switchport access vlan 10
switchport mode access
no ip address
!
interface FastEthernet0/7
switchport access vlan 20
switchport mode access
no ip address
!
interface FastEthernet0/8
switchport access vlan 20
switchport mode access
no ip address
!
interface FastEthernet0/9
switchport access vlan 30
switchport mode access
no ip address
!
interface FastEthernet0/10
switchport access vlan 30
switchport mode access
no ip address
!
interface FastEthernet0/11
switchport access vlan 40
switchport mode access
no ip address
!
interface FastEthernet0/12
switchport access vlan 40
switchport mode access
no ip address
!
interface FastEthernet0/13
switchport access vlan 50
switchport mode access
no ip address
!
interface FastEthernet0/14
switchport access vlan 50
switchport mode access
no ip address
!
interface FastEthernet0/15
switchport access vlan 60
switchport mode access
no ip address
!
interface FastEthernet0/16
switchport access vlan 60
switchport mode access
no ip address
!
interface FastEthernet0/17
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/18
switchport mode dynamic desirable
no ip address
no ip address
!
interface FastEthernet0/19
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/20
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/21
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/22
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/23
switchport mode dynamic desirable
no ip address
!
interface FastEthernet0/24
switchport mode dynamic desirable
switchport mode dynamic desirable
no ip address
!
interface GigabitEthernet0/1
switchport mode dynamic desirable
no ip address
!
interface GigabitEthernet0/2
switchport mode dynamic desirable
no ip address
!
interface Vlan1
no ip address
shutdown
!
interface Vlan10
ip address 172.22.10.1 255.255.255.0
!
interface Vlan20
ip address 172.22.20.1 255.255.255.0
!
interface Vlan30
ip address 172.22.30.1 255.255.255.0
!
!
interface Vlan40
ip address 172.22.40.1 255.255.255.0
!
interface Vlan50
ip address 172.22.50.1 255.255.255.0
!
interface Vlan60
ip address 172.22.60.1 255.255.255.0
!
interface Vlan100
ip address 172.1.1.1 255.255.0.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 172.1.1.2
ip http server
!
!
!
line con 0
line vty 0 4
password 123456
login
line vty 5 15
password 123456
login
!
end
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