Port Vlan Id - D-Link xStack Reference Manual

xStack® DES-3200 Series Layer 2 Ethernet Managed Switch WEB UI Reference Guide
The tag is inserted into the packet header making the entire packet longer by four octets. All of the information
originally contained in the packet is retained.
Figure 3 - 3. IEEE 802.1Q Tag
The EtherType and VLAN ID are inserted after the MAC source address, but before the original EtherType/Length or
Logical Link Control. Because the packet is now a bit longer than it was originally, the Cyclic Redundancy Check
(CRC) must be recalculated.
Figure 3 - 4. 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 of 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 the port that corresponded to the packet's destination address (found in the Switch's
forwarding table). If the PVID of the port that received the packet is different from the PVID of the port that is to
transmit the packet, the Switch will drop the packet.
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