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
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
同时选择多个端口
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
Switch(config)# interface 端口号 Switch(config-if)# switchitchport protected //开启端口保护功能
注：思科个别型号交换机采用PVLAN来实现端口保护功能
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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