Hi - Im having trouble understanding this concept. Yes I guess its self-explanatory - But can someone please explain to me why you would - Untag the Port VLAN ID only on a trunk port. So I take it this means that the VLAN itself is tagged to diferentiate the different VLAN traffic on a trunk port but the VLAN ID is not tagged? - Am I correct? Why untag the VLAN ID only - what purpose in this? Thanks for info anyone?