User`s guide

AT-S25 Version 1.4 User’s Guide
149
General Rules to
Creating a
Tagged VLAN
Below is a summary of the rules to observe when creating a tagged
VLAN.
❑ Each tagged VLAN must be assigned a unique VID. If a particular
VLAN spans multiple switches or stacks, each part of the VLAN on
the different switches or stacks must be assigned the same VID.
❑ An untagged port can be an untagged member of only one VLAN
at a time.
❑ A tagged port can be a member of multiple tagged VLANs.
❑ When creating a tagged VLAN in an AT-8300 stack, you create the
VLAN only once. You do not create the VLAN separately on each
switch in a stack. Once you have created a VLAN, you can assign it
ports from any or all of the switches in the stack.
❑ Each port must be assigned a PVID. This value must be the same
for all ports in a port-based VLAN and must match the VLAN’s VID.
This function is performed automatically by the AT-S25
management software.