D-Link DGS-3308 Series User Manual page 174

Port VLAN ID (PVID)
The Port VLAN ID is used by the port to tag outgoing, untagged packets, and to make filtering decisions about incoming
packets. If the port is specified as tagging, and an untagged packet if forwarded to the port for transmission, the port will
add an 802.1Q tag using the PVID to write the VID in the tag. When the packet arrives at its destination, the receiving
device will use the PVID to make VLAN forwarding decisions. If a packet is received by the port, and Ingress filtering is
enabled, the port will compare the VID of the incoming packet to its PVID. If the two are unequal, the port will drop the
packet. If the two are equal, the port will receive the packet
Description of item on the screen above:
PVID – Shows the current PVID assignment for each port. The Switch's default is to assign all ports to the
Default_VLAN with a VID of 1.
Port Ingress Filter
The following window allows you to configure a Port Ingress Filter on the Switch.
Items on the screen above include:
Port – The number of the port for which ingress filtering is to be Enabled or Disabled.
Ingress Filter – Specifies the port to check the VID of incoming packets against its VID or PVID. If the two are
equal, the port will receive the packet. It the two are unequal, the port will drop the packet. This is used to limit
traffic to a single VLAN.
Figure 7-22. Port VLAN ID (PVID) screen
Figure 7-23. Port Ingress Filter screen
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8-port Gigabit Ethernet Switch User's Guide