cisco思科交换机Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.

cisco思科交换机Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.

思科交换机当遇到：
    输入 Switch(config-if)#swicthport  mode trunk  想改变端口为trunk 模式时 报出错误
    Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.
     （中文：命令被拒绝：接口的中继封装是“自动”不能被配置的“主干”模式。）
只需要 像单臂路由一样 给端口封装一个  接口封装协议。如下命令
    Switch(config-if)#switchport trunk encapsulation dot1q 

Cisco-sw1(config-if)#switchport trunk encapsulation ?
  dot1q      Interface uses only 802.1q trunking encapsulation when trunking
  isl        Interface uses only ISL trunking encapsulation when trunking
  negotiate  Device will negotiate trunking encapsulation with peer on
             interface
Cisco-sw1(config-if)#switchport trunk encapsulation

VLAN、接口的链路类型 （列表、list、全）vlanlist、accesslist、trunklist、hybridlist
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