Allied Telesis AT-S25 - Manual (Page 141)

AT-S25 Version 1.4 User’s Guide
141
Port-based VLAN
A port-based VLAN is a group of ports on an AT-8324 or AT-8316F Series
switch that have been grouped together to form a logical Ethernet
segment. A port-based VLAN can have as many or as few ports as
needed. The VLAN can include ports from just one switch in an AT-8300
stack, or it can include ports from multiple switches in a stack. A port-
based VLAN can even span different stacks or switches (including AT-
8224XL and AT-8216F Series switches).
Parts of a Port-
based VLAN
The parts that make up a port-based VLAN are:
❑ VLAN name
❑ VLAN Identifier
❑ Port VLAN Identifier
❑ Untagged ports
VLAN Name
To create a port-based VLAN, you must give it a name. The name should
reflect the function of the network devices to be members of the VLAN.
Examples include Sales, Production, or Engineering.
VLAN Identifier
Each VLAN in a network must have a unique number assigned to it. This
number is called the VLAN identifier (VID). This number uniquely
identifies a VLAN in the switch and the network.
If a VLAN consists only of the ports located on one physical AT-8300
Series stack in your network, you would assign it a VID unique from all
other VLANs in your network. If a VLAN spans multiple stacks or switches,
then the VID for the VLAN on each stack or switch will be the same. In
this manner, the switches are able to recognize and forward frames
belonging to the same VLAN even though the VLAN itself spans multiple
switches. For example, if you had a port-based VLAN titled Marketing
that spanned three switches, you would assign the Marketing VLAN on
each of the switches the same VID.