C H A P T E R 2
Using the Intel
®
Express 530T Switch
17
Us
in
g
th
e
53
0T
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 530T switch supports two types of VLANs:
•
Port-based
•
IEEE 802.1Q (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 22 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 530T supports a maximum of 24 port-
based VLANs. A port can belong to only one VLAN at a time.
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.
When a 530T switch is stacked with one or more 535T switches, ports
from any of the switches can be members of a port-based VLAN.
1
3
5
7
9
11
13
15
17
19
21
2
4
6
8
10
12
14
16
18
20
22
Local
Management
(EIA 232)
Console: 9600-8-N-1
FlowCtrl=None
Link\Activity
Link = Solid Green
Activity = Blinking Green
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Switch
Status
Status Sw1
Sw2
Sw3
Matrix
Module
Status Port 1
Link/
Act
Port 2
Link/
Act
Module A
(Gigabit)
Intel
®
Express 530T Switch
VLAN 1:
Engineering
These devices
are members
of VLAN 2
VLAN 2:
Marketing
These devices
are members
of VLAN 1
530-Chapter2.fm Page 17 Monday, September 11, 2000 4:14 PM
