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（1） Untagged: The untagged port can be added in multiple VLANs. If a VLAN-tagged
packet arrives at a port and the VLAN ID in its VLAN tag does not match any of the
VLAN the ingress port belongs to, this packet will be dropped. The packets forwarded
by the untagged port are untagged.
（2） Tagged: The tagged port can be added in multiple VLANs. If a VLAN-tagged packet
arrives at a port and the VLAN ID in its VLAN tag does not match any of the VLAN the
ingress port belongs to, this packet will be dropped. When the VLAN-tagged packets
are forwarded by the Tagged port, its VLAN tag will not be changed.
PVID
PVID (Port VLAN ID) is the default VID of the port. When the switch receives an
un-VLAN-tagged packet, it will add a VLAN tag to the packet according to the PVID of its
received port and forward the packets.
When creating VLANs, the PVID of each port, indicating the default VLAN to which the port
belongs, is an important parameter with the following two purposes:
（1） When the switch receives an un-VLAN-tagged packet, it will add a VLAN tag to the
packet according to the PVID of its received port
（2） PVID determines the default broadcast domain of the port, i.e. when the port receives
UL packets or broadcast packets, the port will broadcast the packets in its default
VLAN.
Different packets, tagged or untagged, will be processed in different ways, after being received
by ports of different link types, which is illustrated in the following table.
Port Type
Receiving Packets Forwarding Packets
Untagged
Packets
Tagged Packets
Untagged
Packets
Tagged
Packets
Untagged
When untagged
packets are
received, the
port will add the
default VLAN
tag, i.e. the PVID
of the ingress
port, to the
packets.
If the VID of packet
is allowed by the
port, the packet will
be received.
If the VID of packet
is forbidden by the
port, the packet will
be dropped.
The packet will be
forwarded
unchanged.
The packet will
be forwarded
after removing
its VLAN tag
Tagged
The packet will be
forwarded with the
PVID of egress port
as its VLAN tag.
The packet will
be forwarded
with its current
VLAN tag.
Table 6-1 Relationship between Port Types and VLAN Packets Processing
IEEE 802.1Q VLAN function is implemented on the VLAN Config and Port Config pages.
6.1.1 VLAN Config
On this page, you can configure the 802.1Q VLAN and its ports.
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