Allied Telesis AT-S62 - Manual (Page 584)

Chapter 28: Protected Ports VLANs
Section V: Virtual LANs 584
Allied Telesyn recommends that you create tables similar to this before
you create your own protected ports VLAN. You are prompted for this
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.