Intel Express 530T User Manual page 24

C H A P T E R
NOTE
When a 530T is stacked with
one or more 535T switches,
ports from any/all of the
switches can be members of
each VLAN.
18
®
2 Intel Express 530T Switch Users Guide
IEEE 802.1Q (tag)-based VLANs
The second type of VLAN supported by the 530T switch is based on the
IEEE 802.1Q specification. The specification provides a uniform way for
creating VLANs within a network and allows the creation of a VLAN
that can also span across the network. Until recently, VLAN
implementation was vendor specific so it was not possible to create a
VLAN across devices from different vendors.
The 802.1Q VLAN works by using a tag added to the Ethernet frames.
The tag contains a VLAN Identifier (VID) that identifies the frame as
belonging to a specific VLAN. These tags allow switches that support the
802.1Q specification to segregate traffic between devices and
communicate a device's VLAN association across switches.
® Switch
Intel Express 530T Switch
Status
Intel ® Express 535T Switch Switch
Status
VLAN 1:
Engineering
VLAN 1 computers
can't see VLAN 2
computers
There are multiple advantages to implementing 802.1Q VLANs. First, it
helps to contain broadcast and multicast traffic across the switch thus
improving performance. Second, ports can belong to more than one
VLAN. Third, VLANs can span multiple switches that support the
802.1Q specification. Finally, it can provide security and improve
performance by logically isolating users and grouping them together.
The 530T switch supports up to 2047 tag-based VLANs.
A logical grouping can be mapped to a work group. For example, you can
create a VLAN that groups all the users from the engineering department
into one VLAN. A benefit of this logical grouping is that it can improve
performance by cutting down traffic that belongs to a different logical
group (for example, marketing), improve security (engineering can't see
marketing), and ease moves since the user doesn't have to be physically
located in the same group to participate in the VLAN.
When a 530T switch is stacked with one or more 535T switches, ports
from any/all of the switches can be members of a tag-based VLAN.
Matrix Module A 1 2 3 4 5 6 7 8 9 10 11
Module Status Sw1 Sw2 Sw3 (Gigabit) Status Port 1 Port 2
Link/ Link/
Act Act
Local
Console: 9600-8-N-1
Management
FlowCtrl=None
(EIA 232)
Link\Activity
Link = Solid Green
Activity = Blinking Green
1 3 5 7 9 11
2 4 6 8 10
Stacking Module A
1 2 3 4 5 6 7 8 9 10 11 12
Module Status Link Port 1 Port 2
10/100Base-T Module
Link\Activity
Link = Solid Green
Port 1 Port 2
Activity = Blinking Green
1 3 5 7 9 11
Module A 2 4 6 8 10 12
12 13 14 15 16 17 18 19 20 21 22
530T
13 15 17 19 21
12 14 16 18 20 22
13 14 15 16 17 18 19 20 21 22
535T
13 15 17 19 21
14 16 18 20 22
VLAN 2:
Manufacturing
Server and printer
are members of both
VLANs