Allied Telesis AT-S63 - Manual (Page 502)

Chapter 22: Protected Ports VLANs
502 Section III: VLANs
information when you create the VLAN, and having the tables handy will
make the job easier.
Protected Ports
VLAN
Guidelines
Following are some guidelines for implementing protected ports VLANS:
❑ A switch can contain multiple protected ports VLANs.
❑ A protected ports VLAN should contain a minimum of two groups.
A protected ports VLAN of only one group has little value. Create
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.
❑ An uplink port 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.
❑ A port that is already an untagged member of a protected ports
VLAN cannot be made an untagged member of another VLAN
until it is first removed from its current VLAN assignment and
returned to the Default_VLAN.