Virtual Lans - Intel ES460MSX - Ethernet 1000Base SX Switch Module User Manual

C H A P T E
460T Ch2.p65
R 2 Using the Express 460T Switch

Virtual LANs

A Virtual LAN is a logical network grouping that allows you to isolate
network traffic so members of the VLAN receive traffic only from other
members. Creating a VLAN is the physical equivalent of moving a group of
devices to a separate switch (creating a Layer 2 broadcast domain). The
advantage of VLANs is that you can reduce broadcast traffic for the entire
switch, and increase security, without changing the wiring of your network.
The Express 460T switch supports three types of VLANs:
• Port-based
• MAC-based
• Tag-based
Port-based VLANs
This is the simplest and most common form of VLAN. In a port-based
VLAN, the system administrator assigns the switch's ports to a specific
VLAN. For example, the system administrator can designate ports 2, 4, 6,
and 9 as part of the engineering VLAN and ports 17, 19, 21, and 23 as part
of the marketing VLAN. The advantage of port-based VLANs is that they
are easy to configure and all changes happen at the switch so they are
transparent to the users. The Express 460T supports a maximum of 12 port-
based VLANs. A port can belong to only one VLAN at a time.
These devices
are members
of VLAN 1
VLAN 1:
Engineering
If a user changes location, the system administrator reassigns the port to the
new VLAN. Another advantage is if a hub is connected to a port that is part
of a VLAN, all devices connected to the hub are also part of the VLAN. The
disadvantage is that there is no way to exclude an individual device on that
hub from becoming part of the VLAN.
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Module A
® Port 1 Port 2
Intel Express 460T Standalone Switch
Status Link\Act\Coll Link\Act\Coll
MDI 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
MDI-X
4/19/00, 4:09 PM
Status
Left
24 Link = Solid Green
Activity = Blinking Green
Collision = Blinking Orange
Right
10Mbps = Solid Orange
100Mbps = Off
These devices
are members
of VLAN 2
VLAN 2:
Marketing
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