TP-Link TL-SG3216 manual ¾ Pvid

（2） TRUNK: The TRUNK port can be added in multiple VLANs, and the egress rule of the port is TAG. The TRUNK port is generally used to connect the cascaded network devices for it can receive and forward the packets of multiple VLANs. When the packets are forwarded by the TRUNK port, its VLAN tag will not be changed.

（3） GENERAL: The GENERAL port can be added in multiple VLANs and set various egress rules according to the different VLANs. The default egress rule is UNTAG. The PVID can be set as the VID number of any VLAN the port belongs to.

¾PVID

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.

			Receiving Packets
Port Type									Forwarding Packets
	Untagged Packets				Tagged Packets
					If the VID of packet is
					the same as the PVID
					of the port, the packet			The	packet	will	be
Access					will be received.
					If the VID of packet is			forwarded after removing its
								VLAN tag.
					not the same as the
					PVID of the port, the
	When	untagged			packet will be dropped.
	packets			are
	received,	the		port				The	packet	will	be
Trunk	will add	the	default					forwarded with		its current
	VLAN tag,		i.e.	the				VLAN tag.
	PVID of the ingress				If the VID of packet is
	port, to the packets.				allowed by the port, the			If the egress rule of port is
					packet will be received.			TAG, the packet will be
					If the VID of packet is			forwarded with		its current
					forbidden by	the	port,	VLAN tag.
General					the packet	will	be	If the egress rule of port is
					dropped.			UNTAG, the packet will be
								forwarded after removing its
								VLAN tag.

Table 6-1 Relationship between Port Types and VLAN Packets Processing

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