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Chapter 4: Examples
4-4 802.1Q VLAN User’s Guide
6. The switch examines its VLAN configuration information and
determines that the frame for Red VLAN is allowed to be forwarded
out Port 1 and that it must be sent in an untagged format.
7. The switch forwards the frame out Port 1. Any other unicast
transmissions between stations R1 and R2 will be handled identically.
4.2 EXAMPLE 2, VLANS ACROSS MULTIPLE
SWITCHES
This second example investigates the steps that must be taken to set up
VLANs across multiple 802.1Q VLAN switches. This includes the
configuration and operation of 1Q Trunks between 802.1Q VLAN
switches.
As shown in Figure 4-3, two companies, “Redco” and “Blue Industries”,
share floors 2 and 4 in a building where the network infrastructure is
supplied by the building owner. The objective is to completely isolate the
network traffic of the two companies by limiting the user’s traffic through
the ports of two switches, thus maintaining security and shielding the
network traffic from each company. This example will show the use and
configuration of a 1Q Trunk connection and the creation of VLANs across
multiple switches.