VIRTUAL LANS
frame to the port’s default VLAN if the frame is untagged (determined by the PVID of the receiving port), or maps it for output to the broadcast domain associated with the frame’s VLAN tag.
Port Overlapping
Port overlapping can be used to allow access to commonly shared network resources among different VLAN groups, such as file servers or printers. Note that if you implement VLANs which do not overlap, but still need to communicate, you can connect them using a Layer 3 switch or a router.
Forwarding Tagged/Untagged Frames
Ports can be assigned to multiple tagged or untagged VLANs. Each port on the switch is therefore capable of passing tagged or untagged frames. To forward a frame from a
