	命令	目的
Step 1	configure terminal	进入配置状态
Step 2	interface range {port-range}	进入组配置状态
Step 3		可以使用平时的端口配置命令进行配置
Step 4	end	退回
Step 5	show interfaces [interface-id]	验证配置
Step 6	copy running-config startup-config	保存

当使用interface range命令时有如下的规则:

有效的组范围:

vlan从1 到4094
fastethernet 槽位/{first port} - {last port}, 槽位为0
gigabitethernet槽位/{first port} - {last port},槽位为0
port-channel port-channel-number - port-channel-number, port-channel号从1到64

端口号之间需要加入空格，如：interface range fastethernet 0/1 – 5 是有效的，而interface range fastethernet 0/1-5 是无效的.
interface range 命令只能配置已经存在的interface vlan
所有在同一组的端口必须是相同类别的。

见以下例子:

Switch# configure terminal

Switch(config)# interface range fastethernet0/1 - 5

Switch(config-if-range)# no shutdown

Switch(config-if-range)#

*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to up

*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to up

*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet0/4, changed state to up

*Oct  6 08:24:35: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to up

*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/05,

changed state to up

*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/3, changed

state to up

*Oct  6 08:24:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/4, changed

state to up

以下的例子显示使用句号来配置不同类型端口的组:

Switch# configure terminal

Switch(config)# interface range fastethernet0/1 - 3, gigabitethernet0/1 - 2

Switch(config-if-range)# no shutdown

Switch(config-if-range)#

*Oct  6 08:29:28: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up

*Oct  6 08:29:28: %LINK-3-UPDOWN: Interface FastEthernet0/2, changed state to up

*Oct  6 08:29:28: %LINK-3-UPDOWN: Interface FastEthernet0/3, changed state to up

*Oct  6 08:29:28: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

*Oct  6 08:29:28: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed state to up

*Oct  6 08:29:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/ 1,

changed state to up

*Oct  6 08:29:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/ 2,

changed state to up

*Oct  6 08:29:29: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/ 3,

changed state to up

配置二层端口

3550的所有端口缺省的端口都是二层口，如果此端口已经配置成三层端口的话，则需要用switchport来使其成为二层端口。

配置端口速率及双工模式

可以配置快速以太口的速率为10/100Mbps及千兆以太口的速率为10/100/1000-Mbps; 但对于GBIC端口则不能配置速率及双工模式，有时可以配置nonegotiate,当需要联接不支持自适应的其它千兆端口时

	命令	目的
Step 1	configure terminal	进入配置状态.
Step 2	interface interface-id	进入端口配置状态.
Step 3	speed {10 \| 100 \| 1000 \| auto \| nonegotiate}	设置端口速率注 1000 只工作在千兆口. GBIC模块只工作在1000 Mbps下. nonegotiate 只能在这些GBIC上用 1000BASE-SX, -LX, and -ZX GBIC.
Step 4	duplex {auto \| full \| half}	设置全双工或半双工.
Step 5	end	退出
Step 6	show interfaces interface-id	显示有关配置情况
Step 7	copy running-config startup-config	保存

Switch# configure terminal

Switch(config)# interface fastethernet0/3

Switch(config-if)# speed 10

Switch(config-if)# duplex half

端口描述

	命令	目的
Step 1	configure terminal	进入配置模式
Step 2	interface interface-id	进入要加入描述的端口
Step 3	description string	加入描述 (最多240个字符).
Step 4	end	退回.
Step 5	show interfaces interface-id description or show running-config	验证.
Step 6	copy running-config startup-config	保存

Use the no description interface configuration command to delete the description.

This example shows how to add a description on Fast Ethernet interface 0/4 and to verify the description:

Switch# config terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# interface fastethernet0/4

Switch(config-if)# description Connects to Marketing

Switch(config-if)# end

Switch# show interfaces fastethernet0/4 description

Interface Status         Protocol Description

Fa0/4     up             down     Connects to Marketing

配置三层口

Catalyst 3550支持三种类型的三层端口:

SVIs: 即interface vlan

Note 当生成一个interface Vlan时，只有当把某一物理端口分配给它时才能被激活

三层以太网通道口（EtherChannel）
.路由口：路由口是指某一物理端口在端口配置状态下用no switchport命令生成的端口

所有的三层都需要IP地址以实现路由交换

配置步骤如下：

	命令	目的
Step 1	configure terminal	进入配置状态
Step 2	interface {{fastethernet \| gigabitethernet} interface-id} \| {vlan vlan-id} \| {port-channel port-channel-number}	进入端口配置状态
Step 3	no switchport	把物理端口变成三层口
Step 4	ip address ip_address subnet_mask	配置IP地址和掩码
Step 5	no shutdown	激活端口
Step 6	end	退出
Step 7	show interfaces [interface-id] show ip interface [interface-id] show running-config interface [interface-id]	验证配置
Step 8	copy running-config startup-config	保存配置

配置举例如下：

Switch# configure terminal

Enter configuration commands, one per line.  End with CNTL/Z.

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# no switchport

Switch(config-if)# ip address 192.20.135.21 255.255.255.0

Switch(config-if)# no shutdown

Switch(config-if)# end

show ip interface命令:

Switch# show ip interface gigabitethernet0/2

GigabitEthernet0/2 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

<output truncated>

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	目的
show interfaces [interface-id]	显示所有端口或某一端口的状态和配置.
show interfaces interface-id status [err-disabled]	显示一系列端口的状态或错误－关闭的状态
show interfaces [interface-id] switchport	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。
show interfaces [interface-id] description	显示端口描述
show ip interface [interface-id]	显示所有或某一端口的IP可用性状态
show running-config interface [interface-id]	显示当前配置中的端口配置情况
show version	显示软硬件等情况

举例如下:

Switch# show interfaces status

Port    Name               Status       Vlan       Duplex  Speed Type

Gi0/1                      connected    routed     a-full  a-100 10/100/1000Base

TX

Gi0/2   wce server 20.20.2 disabled     routed       auto   auto 10/100/1000Base TX

Gi0/3   ip wccp web-cache  notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/4                      notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/5                      notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/6                      disabled     routed       auto   auto 10/100/1000Base TX

Gi0/7                      disabled     routed       auto   auto 10/100/1000Base TX

Gi0/8                      disabled     routed       auto    100 10/100/1000Base TX

Gi0/9                      notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/10                     notconnect   routed       auto   auto 10/100/1000Base TX

Gi0/11                     disabled     routed       auto   auto unknown

Gi0/12                     notconnect   routed       auto   auto unknown

Switch# show interfaces fastethernet 0/1 switchport

Name: Fa0/1

Switchport: Enabled

Administrative Mode: static access

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: Off

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: false

Unknown unicast blocked: disabled

Unknown multicast blocked: disabled

Voice VLAN: dot1p (Inactive)

Appliance trust: 5

Switch# show running-config interface fastethernet0/2

Building configuration...

Current configuration : 131 bytes

interface FastEthernet0/2

 switchport mode access

 switchport protected

 no ip address

 mls qos cos 7

 mls qos cos override

end

刷新、重置端口及计数器

Clear命令	目的
clear counters [interface-id]	清除端口计数器.
clear interface interface-id	重置某一端口的硬件逻辑
clear line [number \| console 0 \| vty number]	重置异步串口的硬件逻辑

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 fastethernet0/5

Clear "show interface" counters on