思科交换机没有 Trunk 封装选项
Switch(config-if)#switchport trunk ?
allowed Set allowed VLAN characteristics when interface is in trunking mode
native Set trunking native characteristics when interface is in trunking
mode
Switch(config-if)#switchport trunk encapsulation dotlq
^
% Invalid input detected at '^' marker.
原因是新的思科交换机设备只支持802.1q的封装格式,故没有封装选项,直接 switchport mode trunk 就可以了。