Forwarding Tagged/Untagged Frames - SMC Networks 6724L2 - annexe 1 Management Manual

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the specified VLANs, and pass the message on to all other ports.
VLAN requirements are propagated in this way throughout the
network. This allows GVRP-compliant devices to be automatically
configured for VLAN groups based solely on endstation requests.

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 2-43 or 3-36).
VLAN aware
VLAN aware
4-8
VLAN 1,2
(802.1Q tags)
VLAN aware
trunk
VLAN 1,2,3
(802.1Q tags)
VLAN aware
VLAN 1,2,3
(802.1Q tags)
VLAN aware
VLAN 1,3
(802.1Q tags)
VLAN 1,3
(untagged)
VLAN unaware