You must assign a unique number to each tagged VLAN in a network. This
number is called the tagged VLAN ID. This number uniquely identifies a
tagged VLAN in the AT-GS950/8 switch and across the network.

VLAN Name

To create a tagged VLAN, you must give it a unique name. This name can
reflect the function of the network devices that are VLAN members, such
as Sales, Production, and Engineering.

Tagged and Untagged Ports

When you specify that a port is a member of a tagged VLAN, you need to
specify that it is tagged or untagged. By definition, the port is a static
member of a tagged VLAN when it is configured as either a tagged or
untagged port. You can have a combination of tagged and untagged ports
in the same VLAN.

Note

A port can also be dynamically assigned to a tagged VLAN within a
voice VLAN configuration which is a special configuration of a
tagged VLAN. For more information concerning static and dynamic
membership in a tagged VLAN, see “Overview” on page 270 in the
“Voice VLAN” chapter.

Packet transmission from a tagged port differs from packet transmission
from an untagged port. When a packet is transmitted from a tagged port,
the tagged information within the packet is maintained when it is
transmitted to the next network device. If the packet is transmitted from an
untagged port, the VLAN tag information is removed from the packet
before it is transmitted to the next network device.

The IEEE 802.1Q standard describes how tagging information within a
packet is used to forward or discard traffic throughout the switch. If the
incoming packet has a VLAN tag that matches one of the Group IDs of
which the port is a member, the packet is accepted and forwarded to the
appropriate port(s) within that VLAN. If the incoming packet’s VLAN tag

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