User`s guide

AT-S39 Users Guide
122
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.
A tagged port can be a member of multiple VLANs.
An untagged port can be an untagged member of only one VLAN
at a time.
The AT-8000 Series switch can support up to 32 tagged VLANS.