Installation manual

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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 3-186). 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 or untagged VLANs. Each port on the switch is

therefore 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 VLAN(s) indicated by the frame tag. However, when this switch

receives an untagged frame from a VLAN-unaware device, it first decides where to

forward the frame, and then inserts a VLAN tag reflecting the ingress port’s default VID.

Port-based VLAN

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