Planet GS-5220 Series User Manual page 190

transmitting port is connected to a tag-unaware device, the packet should be untagged. If the transmitting port
is connected to a tag-aware device, the packet should be tagged.
■ Default VLANs
The Switch initially configures one VLAN, VID = 1, called "default." The factory default setting assigns all ports on
the Switch to the "default". As new VLAN are configured in Port-based mode, their respective member ports are
removed from the "default."
■ Assigning Ports to VLANs
Before enabling VLANs for the switch, you must first assign each port to the VLAN group(s) in which it will
participate. By default all ports are assigned to VLAN 1 as untagged ports. Add a port as a tagged port if you want
it to carry traffic for one or more VLANs, and any intermediate network devices or the host at the other end of
the connection supports VLANs. Then assign ports on the other VLAN-aware network devices along the path that
will carry this traffic to the same VLAN(s), either manually or dynamically using GVRP. However, if you want a
port on this switch to participate in one or more VLANs, but none of the intermediate network devices nor the
host at the other end of the connection supports VLANs, then you should add this port to the VLAN as an
untagged port.
VLAN-tagged frames can pass through VLAN-aware or VLAN-unaware network
interconnection devices, but the VLAN tags should be stripped off before passing it on
to any end-node host that does not support VLAN tagging.
■ VLAN Classification
When the switch receives a frame, it classifies the frame in one of two ways. If the frame is untagged, the switch
assigns the frame to an associated VLAN (based on the default VLAN ID of the receiving port). But if the frame is
tagged, the switch uses the tagged VLAN ID to identify the port broadcast domain of the frame.
User's Manual of GS-5220 LCD Series
190