Allied Telesis AT-S63 - Manual (Page 347)

AT-S63 Management Software Features Guide
Section VI: Virtual LANs 347
Guidelines
Following are the guidelines for implementing protected ports VLANS:
 A protected ports VLAN should contain a minimum of two groups. A
protected ports VLAN of only one group can be replaced with a port-
based or tagged VLAN instead.
 A protected ports VLAN can contain any number of groups.
 A group can contain any number of ports.
 The ports of a group can be tagged or untagged.
 Each group must be assigned a unique group number on the switch.
The number can be from 1 to 256.
 A protected ports VLAN can contain more than one uplink port.
 The switch can support up to a total of 4094 port-based, tagged,
protected ports, and MAC address-based VLANs.
 Uplink ports can be either tagged or untagged.
 Uplink ports can be shared among more than one protected ports
VLAN, but only if they are tagged.
 A switch can contain a combination of port-based and tagged VLANs
and protected ports VLANs.
 A port that is a member of a group in a protected ports VLAN cannot
be a member of a port-based or tagged VLAN.
 A group can be a member of more than one protected ports VLAN at a
time. However, the port members of the group must be identical in both
VLANs and the ports must be tagged.
 You cannot create protected ports VLANs when the switch is operating
in a multiple VLAN mode.
 An untagged port of a protected ports VLAN can not be made an
untagged member of another protected ports VLAN until it is first
removed from its current VLAN assignment and returned to the
Default_VLAN.
 The switch must be set to the user-configured VLAN mode to support
protected ports VLANs.