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15
Using the Intel
®
NetStructure™ 470T and 470F Switches
CHAPTER 2
Using the 470 Switch
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. The example below shows a
470F switch.
12345678
TX RX TX RX TX RX TX RX TX RX TX RX TX RX TX RX
Link\Act
Status
Console: 9600-8-N-1
Flow Ctrl=None
Local
Management
(EIA 232)
Link\Activity
Link = Solid Green
Activity = Blinking Green
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Intel
®
NetStructure
™
470F Switch
VLAN 1:
Engineering
Server and Printer
are members of both
VLANs
VLAN 2:
Manufacturing
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.
A logical grouping can be mapped to a workgroup. For example, you can
create a VLAN that groups all the users from the engineering department.
Benefits of this logical grouping are: it improves performance by reducing
traffic that belongs to a different logical group (e.g. marketing), improves
security (engineering can’t see marketing), and eases moves because the
user doesn’t have to be physically located in the same group to participate in
the VLAN.