D-Link DES-3326 User Manual page 79

the PVID of the port that is to transmit the packet, the switch
will drop the packet.
Within the switch, different PVIDs mean different VLANs.
(remember that two VLANs cannot communicate without an
external router). So, VLAN identification based upon the PVIDs
cannot create VLANs that extend outside a given switch (or
switch stack).
Every physical port on a switch has a PVID. 802.1Q ports are
also assigned a PVID, for use within the switch. If no VLANs are
defined on the switch, all ports are then assigned to a default
VLAN with a PVID equal to 1. Untagged packets are assigned
the PVID of the port on which they were received. Forwarding
decisions are based upon this PVID, in so far as VLANs are
concerned. Tagged packets are forwarded according to the VID
contained within the tag. Tagged packets are also assigned a
PVID, but the PVID is not used to make packet forwarding
decisions, the VID is.
Tag-aware switches must keep a table to relate PVIDs within the
switch to VIDs on the network. The switch will compare the VID
of a packet to be transmitted to the VID of the port that is to
transmit the packet. If the two VIDs are different, the switch
will drop the packet. Because of the existence of the PVID for
untagged packets and the VID for tagged packets, tag-aware and
tag-unaware network devices can coexist on the same network.
A switch port can have only one PVID, but can h ave as many
VIDs as the switch has memory in its VLAN table to store them.
Note:
default VLAN with all ports assigned to it. This gives all
ports a PVID = 1, and is used within the switch to relate
PVIDs to VIDs. In practice, this default VLAN is part of
the factory default settings and all ports will initially
have a PVID = 1.
Switch Management and Operating Concepts
24-port NWay Ethernet Switch User's Guide
802.1Q VLANs require the switch to create a
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