LAN9117 Просмотр технического описания (PDF) - SMSC -> Microchip

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LAN9117

High Performance Single-Chip 10/100 Non PCI Ethernet Controller

SMSC -> Microchip 

High Performance Single-Chip 10/100 Non-PCI Ethernet Controller

Datasheet

Network efficiency: Allows shielding one system resource from traffic not meant for that resource. A

workstation in one VLAN is shielded from traffic on another VLAN, increasing that workstation’s

efficiency.

Broadcast containment: Leakage of broadcast frames from one VLAN to another is prevented.

VLAN 3

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DDD

VLAN 2

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AAA

BBB

LAN Switch #1

VLAN 1

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GGG

HHH

LAN Switch #2

VLAN Config Data

Address

AAA

BBB

CCC

DDD

EEE

FFF

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VLAN #

VLAN 3

VLAN 3

VLAN 3

VLAN 2

VLAN 2

VLAN 2

VLAN 1

VLAN 1

LAN Switch #3

Figure 3.1 VLAN Topology

When the members of a VLAN are not located on the same physical medium, the VLAN uses a tag

to help it determine how to forward the frame from one member to another. The tag structure was

proprietary until the IEEE released a supplement to 802.3 defining the VLAN frame structure, including

the tag. This new frame structure for VLAN is depicted in Figure 3.2, "VLAN Frame".

Revision 1.1 (05-17-05)

24

DATASHEET

SMSC LAN9117

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