Port Vlan Id - D-Link DES-3326 User Manual

DES-3326 Layer 3 Fast Ethernet Switch User's Guide
Control. Because the packet is now a bit longer than it was
originally, the Cyclic Redundancy Check (CRC) must be
recalculated.
Figure 5-9. Adding an IEEE 802.1Q Tag

Port VLAN ID

Packets that are tagged (are carrying the 802.1Q VID information)
can be transmitted from one 802.1Q compliant network device to
another with the VLAN information intact. This allows 802.1Q
VLANs to span network devices (and indeed, the entire network –
if all network devices are 802.1Q compliant).
Unfortunately, not all network devices are 802.1Q compliant.
These devices are referred to as tag-unaware. 802.1Q devices are
referred to as tag-aware.
Prior to the adoption 802.1Q VLANs, port-based and MAC-based
VLANs were in common use. These VLANs relied upon a Port
VLAN ID (PVID) to forward packets. A packet received on a given
port would be assigned that port's PVID and then be forwarded to
Switch Management and Operating Concepts
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