Thanks for the reply.

Here is the example which is actually configured in our switch.

In this case,  what VLAN frame would a PC receive?

switchport general pvid 60

switchport general allowed vlan add 60

switchport general allowed vlan add 10,70 tagged

switchport access vlan 91

This is happening in our switch, and according to your explanation this config is conflict. What would happen to the PC connected to the port with this conflict config?

Your explanation is very clear.

So the point is if the mode command is given to the interface or not . Now I get it.

Thanks, Daniel.

One more question.

What if the interface is not given switchport mode command, like the following example,

interface Gi1/0/9
switchport general pvid 60
switchport general allowed vlan add 60
switchport general allowed vlan add 10,70 tagged
switchport access vlan 91
exit
!