SMC Networks SMC Tiger 10/100 SMC6128L2 - Manual (Page 218)

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ONFIGURING THE
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WITCH
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should also determine security boundaries in the network and disable
GVRP on the boundary ports to prevent advertisements from being
propagated, or forbid those ports from joining restricted VLANs.
Note: If you have host devices that do not support GVRP, you should
configure static or untagged VLANs for the switch ports
connected to these devices (as described in “Adding Static
Members to VLANs (VLAN Index)” on page 3-170). But you can
still enable GVRP on these edge switches, as well as on the core
switches in the network.
Forwarding Tagged/Untagged Frames
If you want to create a small port-based VLAN for devices attached
directly to a single switch, you can assign ports to the same untagged
VLAN. However, to participate in a VLAN group that crosses several
switches, you should create a VLAN for that group and enable tagging on
all ports.
Ports can be assigned to multiple tagged VLANs, but are only allowed one
untagged VLAN. Each port on the switch is capable of passing tagged or
untagged frames. When forwarding a frame from this switch along a path
that contains any VLAN-aware devices, the switch should include VLAN
tags. When forwarding a frame from this switch along a path that does not
contain any VLAN-aware devices (including the destination host), the
switch must first strip off the VLAN tag before forwarding the frame.
When the switch receives a tagged frame, it will pass this frame onto the
Port-based VLAN
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