VLAN C
ONFIGURATION
3-179
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
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.
Enabling or Disabling GVRP (Global Setting)
GARP VLAN Registration Protocol (GVRP) defines a way for switches to
exchange VLAN information in order to register VLAN members on
ports across the network. VLANs are dynamically configured based on
join messages issued by host devices and propagated throughout the
network. GVRP must be enabled to permit automatic VLAN registration,
and to support VLANs which extend beyond the local switch. (Default:
Disabled)
Note: GVRP is not supported in the current software.
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