
Configuring 802.1Q Tagging
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5-5
In contrast, Figure 5-3 depicts a topology in which the same three VLANs share a
common connection to the adjacent router. This common connection is enabled by
a packet encapsulation format specified in IEEE 802.1Q, Draft Standard for
Virtual Bridged Local Area Networks. This packet encapsulation format is
referred to as 802.1Q tagging.
Figure 5-3. Connecting VLANs Using 802.1Q Tagging
VLAN
device
SN0021A
Router
Marketing
IP VLAN
Engineering
IP VLAN
Sales
all-protocol VLAN
Single untagged port serves the
Marketing and Sales VLANs
Traffic flow
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