环境

• Cisco Packet Tracer 5.3

• Windows 10
  

  操作

  操作：按照如图所示连接拓扑图
  

  # 进入特权模式
  Switch>enable
  # 进入全局配置模式
  Switch#configure terminal
  Enter configuration commands, one per line.  End with CNTL/Z.
  Switch(config)#
  # 进入端口
  Switch(config)#interface FastEthernet0/1
  Switch(config-if)#
  # 禁用
  Switch(config-if)#shutdown
  
  
  %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to administratively down
  Switch(config-if)#
  %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down
  # 使能
  Switch(config-if)#no shutdown
  
  %LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up
  
  %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
  
  Switch(config-if)#