LAN9116 Datasheet, PDF (16/109 Pages) SMSC Corporation – Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller

LAN9116
FIGURE 3-1:
VLAN TOPOLOGY
VLAN 3
CCC
DDD
VLAN 2
EEE
AAA
BBB
LAN Switch #1
VLAN 1
FFF
GGG
HHH
LAN Switch #2
VLAN Config Data
Address
AAA
BBB
CCC
DDD
EEE
FFF
GGG
HHH
VLAN #
VLAN 3
VLAN 3
VLAN 3
VLAN 2
VLAN 2
VLAN 2
VLAN 1
VLAN 1
LAN Switch #3
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 sup-
plement 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".
DS00002268A-page 16
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