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Chapter 1: Virtual Local Area Networks
Building One
Building Two
S
S
S
S
S
S
F
F
F
F
10
9
8
trunk
7
1
6
A
B
MultiSwitch 700
MultiSwitch 700
S
F
Member of Sales Network
Member of Finance Network
2664-01
Figure 1-1 Example of a VLAN
In this example, the Sales and Finance workstations have been placed on
two separate VLANs. In a plain Ethernet environment, the entire network
is a broadcast domain, and the MultiSwitch 700s follow the IEEE 802.1D
bridging specification to send data between stations. A broadcast or
multicast transmission from a Sales workstation in Building One would
propagate to all the switch ports on MultiSwitch 700 A, cross the high
speed link to MultiSwitch 700 B, and be propagated to all the switch ports
on MultiSwitch 700 B. The MultiSwitch 700s treat each port as being
equivalent to any other port, and have no understanding of the
departmental memberships of each workstation.
In a VLAN environment, each MultiSwitch 700 understands that certain
individual ports are members of separate workgroups. In this
environment, a broadcast or multicast data transmission from one of the
Sales stations in Building One would reach MultiSwitch 700 A, be sent to
the ports connected to other local members of the Sales VLAN, cross the
high speed link to MultiSwitch 700 B, and then be sent to any other ports
and workstations on MultiSwitch 700 B that are members of the Sales
VLAN.
1-2
802.1Q VLAN User's Guide
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