多使用Tab和？非常有帮助的你这个命令在29上是不支持的，同时默认就是dot1q, 具体如下：Switch(config-if)#switchport ?access
Set access mode characteristics of the interfacemode
Set trunking mode of the interfacenative
Set trunking native characteristics when interface is in
trunking modenonegotiate
Dev
