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24-port NWay Ethernet Switch User’s Guide

Switch Management Concepts

transmit and receive VLAN traffic, and the difference

between them provides network segmentation, while still

allowing resources to be shared across more than one

VLAN.

VLAN Segmentation

Take for example a packet that is transmitted by a

machine on Port 1 that is a member of VLAN 2 and has the

Port VLAN ID number 2 (PVID=2). If the destination lies on

another port (found through a normal forwarding table

lookup), the switch then looks to see if the other port (Port

10) is a member of VLAN 2 (and can therefore receive

VLAN 2 packets). If port 10 is not a member of VLAN 2,

then the packet will be dropped by the switch and will not

reach it’s destination. If Port 10 is a member of VLAN 2, the

packet will go through. This selective forwarding feature

based on VLAN criteria is how VLANs segment networks.

The key point being that Port 1 will only transmit on VLAN

2, because it’s Port VLAN ID number is 2 (PVID=2).

Sharing Resources Across VLANs

Network resources such as printers and servers however,

can be shared across VLANs. This is achieved by setting up

overlapping VLANs as shown in the diagram below.

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D-Link DES-3225G Manuel d'utilisateur Page 57