Allied Telesis AT-S62 - Manual (Page 618)

Chapter 27: Protected Ports VLANs
618 Section V: VLANs
ˆ A protected ports VLAN can contain any number of groups.
ˆ A group can contain any number of ports.
ˆ The ports of a group can be tagged or untagged.
ˆ Each group must be assigned a unique group number on the switch.
The number can be from 1 to 256.
ˆ A protected ports VLAN can contain more than one uplink port.
ˆ An uplink port can be either tagged or untagged.
ˆ Uplink ports can be shared among more than one protected ports
VLAN, but only if they are tagged.
ˆ A switch can contain a combination of port-based and tagged VLANs
and protected ports VLANs.
ˆ 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.
ˆ 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.
ˆ You cannot create protected ports VLANs when the switch is operating
in a multiple VLAN mode.
ˆ 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.