Step 6 end Step 7 show interfaces [interface-id] show ip interface [interface-id] show running-config interface [interface-id] Step 8 copy running-config startup-config 退出 验证配置 保存配置
配置举例如下：
4006# configure terminal
Enter configuration commands, one per line. End with CNTL/Z. 4006(config)# interface gigabitethernet3/2
4006(config-if)# no switchport
4006(config-if)# ip address 192.20.135.21 255.255.255.0
4006(config-if)# no shutdown
4006(config-if)# end
show ip interface命令:
4006# show ip interface gigabitethernet3/2
GigabitEthernet3/2 is up, line protocol is up Internet address is 192.20.135.21/24 Broadcast address is 255.255.255.255 Address determined by setup command MTU is 1500 bytes
Helper address is not set
Directed broadcast forwarding is disabled
监控及维护端口
监控端口和控制器的状态
主要命令见下表：
Show Commands for Interfaces Command show interfaces [type slot/interface] 目的 显示所有端口或某一端口的状态和配置. 显示一系列端口的状态或错误－关闭的状态 显示二层端口的状态，可以用来决定此口是否为二层或三层口。 显示端口描述 show interfaces interface-id status [err-disabled] show interfaces [interface-id] switchport show interfaces [interface-id] description show protocols [type slot/interface] 显示在任何已配置协议下全局和接口的状态 显示当前配置中的端口配置情况 show running-config interface [interface-id] show version
举例如下:
Switch#show interfaces status
显示软硬件等情况 Port Name Status Vlan Duplex Speed Type Gi1/1 notconnect 1 auto auto No Gbic Gi1/2 notconnect 1 auto auto No Gbic
Gi5/1 notconnect 1 auto auto 10/100/1000-TX Gi5/2 notconnect 1 auto auto 10/100/1000-TX Gi5/3 notconnect 1 auto auto 10/100/1000-TX Gi5/4 notconnect 1 auto auto 10/100/1000-TX
Fa6/1 connected 1 a-full a-100 10/100BaseTX Fa6/2 connected 2 a-full a-100 10/100BaseTX Fa6/3 notconnect 1 auto auto 10/100BaseTX Fa6/4 notconnect 1 auto auto 10/100BaseTX Switch#
This example shows how to display the status of interfaces in error-disabled state: Switch# show interfaces status err-disabled Port Name Status Reason Fa9/4 err-disabled link-flap
informational error message when the timer expires on a cause -------------------------------------------------------------- 5d04h:%PM-SP-4-ERR_RECOVER:Attempting to recover from link-flap err-disable state on Fa9/4 Switch#
Switch# show protocols fastethernet 5/5
FastEthernet5/5 is up, line protocol is up Switch#
刷新、重置端口及计数器
Clear命令 clear counters {type slot/interface} clear interface {type slot/interface} 目的 清除端口计数器. 重置某一端口的硬件逻辑 重置异步串口的硬件逻辑 clear line [number | console 0 | vty number]
Note clear counters 命令只清除用show interface所显示的计数，不影响用snmp得到
的计数
举例如下：
Switch# clear counters fastethernet 5/5
Clear \y Switch#
*Sep 30 08:42:55: %CLEAR-5-COUNTERS: Clear counter on interface FastEthernet5/5
by vty1 (171.69.115.10) Switch#
可使用clear interface 或 clear line 命令来清除或重置某一端口或串口，在大部分情况下并不需要这样做:
Switch# clear interface fastethernet0/5
关闭和打开端口
命令 目的 Step 1 configure terminal 进入配置状态 选择要关闭的端口 关闭 退出 验证 Step 2 interface {vlan vlan-id} | {{fastethernet | gigabitethernet} slot/port} | {port-channel port-channel-number} Step 3 shutdown Step 4 end Step 5 show running-config
使用 no shutdown 命令重新打开端口. 举例如下:
Switch# configure terminal
Switch(config)# interface fastethernet2/5 Switch(config-if)# shutdown Switch(config-if)#
*Sep 30 08:33:47: %LINK-5-CHANGED: Interface FastEthernet2/5, changed state to a administratively down
Switch# configure terminal
Switch(config)# interface fastethernet2/5 Switch(config-if)# no shutdown Switch(config-if)#
*Sep 30 08:36:00: %LINK-3-UPDOWN: Interface FastEthernet2/5, changed state to up
配置VLAN
理解VLAN
一个VLAN就是一个交换网，其逻辑上按功能、项目、应用来分而不必考虑用户的物理位置。任何交换口都可以属于某一VLAN, IP包、广播包及组播包均可以发送或广播给在此VLAN内的最终用户。每一个VLAN均可看成是一个逻辑网络，发往另一VLAN的数据包必须由路由器或网桥转发（如下图）。由于VLAN被看成是一个逻辑网络，其具有自己的网桥管理信息庫 (MIB) 并可支持自己的生成树
VLAN作为逻辑定义的网络示意图
VLAN常常与IP子网相联系，同一IP子网属于同一VLAN。在3550上VLAN之间的数据包可以由VLAN端口进行转发。
可支持的VLAN
Catalyst 4006交换机将来的版本可支持4096个VLAN，可以分别是VTP client, server, 及 transparent modes. VLAN号可以从1到4094. VLAN号1002到1005