D-Link DES-3225G [56/199] Vlans spanning multiple switches

24-port NWay Ethernet Switch User’s Guide

42 Switch Management

Port 7 3

Port 14 1

Port 15 1

Member of VLAN #

VID Ports

1 14,15,7

2 1,2,3,7

3 1,2,3,7,14,15

The printer attached to Port 7 is shared by VLAN 1 and VLAN 2

because Port 7 is a member of both VLANs (it is listed as a member

of VID 1 and 2). Since it can receive packets from both VLANs, all

ports can successfully send packets to it to be printed. Ports 1, 2

and 3 send these packets on VLAN 2 (their PVID=2), and Ports 14

and 15 send these packets on VLAN 1 (PVID=1). The third VLAN

(PVID=3) is used by the printer to send broadcast packets to all

computers to periodically inform them about its presence on the

network. All computers that use the printer will receive these

packets since they are all located on ports which are members of

VLAN 3 (VID=3). If a file server were connected to Port 7 instead of

a printer, VLAN 3 would be used to transmit files that had been

requested on VLAN 1 or 2 back to the computers.

VLANs Spanning Multiple Switches

VLANs can span multiple switches and indeed, your entire

network. Two considerations to keep in mind while building VLANs

of this sort are whether the switches are IEEE 802.1Q-compliant.

Definitions of relevant terms are as follows:

Tagging - The act of putting 802.1Q VLAN information into the

header of a packet. Ports with tagging enabled will put the VID

number, priority and other VLAN information into all packets that

flow into and out it. If a packet has previously been tagged, the port

will not alter the packet, thus keeping the VLAN information

intact. Tagging is used to send packets from one 802.1Q-compliant

device to another.

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Interface

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