ZyXEL Communications VES-1616 - Manual (Page 34)

ZyXEL VES-1616/24FA-5x Series Support Notes
All contents copyright 2008 ZyXEL Communications Corporation. 33
7. After entering the commands, use the “write memory” command under the
enable mode to save your configuration.
What is IEEE 802.1Q Tag-based VLAN?
Tag-based VLAN Overview
In the IEEE 802.1Q standard, Tag-based VLAN uses an extra tag in the MAC
header to identify the VLAN membership of a frame across bridges. This tag is
used for VLAN and QoS (Quality of Service) priority identification. The VLANs can
be created statically by an administrator or dynamically through GVRP. The
VLAN ID
associates a frame with a specific VLAN and provides the information
that switches need to process the frame across the network. A tagged frame is
four bytes longer than an untagged frame and contains two bytes of TPID (Tag
Protocol Identifier, residing within the type/length field of the Ethernet frame) and
two bytes of TCI (Tag Control Information, starts after the source address field of
the Ethernet frame).