Allied Telesis AT-S25 - Manual (Page 143)

AT-S25 Version 1.4 User’s Guide
143
General Rules to
Creating a Port-
based VLAN
Below is a summary of the rules to observe when creating a port-based
VLAN.
❑ Each port-based VLAN must be assigned a unique VID. If a
particular VLAN spans multiples switches or stacks, each part of
the VLAN on the different switches or stacks must be assigned the
same VID.
❑ An port can be an untagged member of only one port-based
VLAN at a time.
❑ When creating a 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 the 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.
❑ A port-based VLAN that spans multiple switches or stacks will
require a port on each switch or stack where the VLAN is located
to function as an interconnection between the switches where
the various parts of the VLAN reside. This is illustrated in the
section Port-based VLAN Example on page 144.
❑ If there are end nodes in different VLANs that need to
communicate with each other, a router or Layer 3 switch will be
required to interconnect the VLANs.