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Figure 17-1 Algorithm for determining the VLAN
17.1.5 VLAN tags
(1) Overview
VLAN tagging based on the IEEE 802.1Q standard, in which IDs called tags are inserted
into Ethernet frames, can be used to configure multiple VLANs on one port.
VLAN tags are used on the trunk port or MAC port. VLAN tags must be recognized on the
trunk ports and MAC ports on the Switch and the partner switch.
(2) Protocol specification
VLAN tags can embed an ID called a tag into an Ethernet frame. These tags are used to
report VLAN information (a VLAN ID) to separate segments.
The figure below shows the tagged-frame format. There are two formats for Ethernet
frames into which VLAN tag are inserted: Ethernet V2 and 802.3.
17 VLANs
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