Ericsson EFN324, User Manual, Page: 17 / 176

Glossary
Parameter values (configuration attributes) may be read from the system using
get commands.
The configuration attributes values are set, modified or deleted using set, add,
remove, connect, disconnect and other commands.
There are also some system commands that do not relate to objects. For
example,
exit
.
4.8 Virtual LAN and VLAN tag
Virtual LAN (VLAN) is a technique used to logically separate several
independent networks that share a common physical infrastructure.
The IEEE 802.1Q standard describes how a 4­byte tag is inserted into
Ethernet packets, between the source address and the length or type field, to
specify the VLAN for the packet.
The 4 byte tag consists of the following:

A 2-byte Tag Protocol Identifier

A 2-byte Tag Control Information
The Tag Control Information consists of a 12­bit VLAN ID, a 3­bit priority field
and a 1­bit Canonical Format Indicator. The latter is only used for Token Ring
transmissions.