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VID
VLAN ID, a 12-bit field specifying the VLAN to which the frame
belongs. The VLAN ID range is 0 to 4095. Usually, 0 and 4095 are
reserved, so a VLAN ID actually ranges from 1 to 4094.
Three types of port link
When creating the 802.1Q VLAN, you should set the link type for the port according to its
connected device. The link types of port include the following three types:
Trunk: A trunk port can carry multiple VLANs to receive and send traffic for them.
Usually, ports for switch cascade are configured as trunk ports.
Hybrid: Like a trunk port, a hybrid port can carry multiple VLANs to receive and send
traffic for them. It can be used for switch cascade or connecting to terminal devices.
Processing relationship between PVID and VLAN packets
PVID (Port VLAN ID) is the default VLAN ID that a port belongs to. PVID indicates the ID
of a default VLAN that a port belongs to. The PVID for an access port is the ID of the
VLAN it belongs to; the default PVID for a trunk/hybrid port is "1" and this value is
configurable.
This switch does not support ingress filter. When only 802.1Q VLAN is configured, Tag
packets of ingress ports will be forwarded to ports in the corresponding VLAN in terms of
VID; Untagged packets of ingress ports will be forwarded to ports in the corresponding
VLAN in terms of these ports PVID.
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 Link
Type
Receiving Packets
Forwarding Packets
Receiving
Tagged Packets
Receiving
Untagged
Packets
Access
Packets will be
forwarded to other
ports in the
corresponding
VLAN according
to the VID in the
Tag.
Packets will be
forwarded to other
ports in the
corresponding
VLAN according
to PVID on this
port.
Packets will be forwarded after
removing VLAN tags.
Trunk
If the VID of packet is the same as
its PVID, the packet will be
forwarded after removing its VLAN
tag; If the VID of packet is not the
same as its PVID, the packet will
be directly forwarded.
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