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port. Therefore, to make valid forwarding and flooding decisions, the
switch learns the relationship of the MAC address to its related
port—and thus to the VLAN—at run-time. When the switch receives
a frame, it assigns the 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 VLAN-aware device to a
VLAN-unaware device, the switch first decides where to forward the
frame, and then strips off the VLAN tag. However, to forward a
frame from a VLAN-unaware device to a VLAN-aware device, the
switch first decides where to forward the frame, and then inserts a
VLAN tag reflecting this port's default VID. The default PVID is
VLAN 1 for all ports, but this can be changed (see page 2-63 or
page 3-41).
4-5
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