Allied Telesis AT-9000 Series - Manual (Page 832)

Chapter 53: Private Port VLANs
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Guidelines
Here are the guidelines to private VLANs:
 A private VLAN can have any number of host ports, up to all the
ports on the switch, minus the uplink port.
 A promiscuous port can be an uplink port of just one private VLAN
at a time, however, a private VLAN can have more than one uplink
port.
 The host ports of private VLANs are untagged ports, and as such,
transmit only untagged traffic.
 The switch can support private, port-based, tagged, and MAC
address-based VLANs at the same time
 Host ports cannot be members of both private VLANs and port-
based or tagged VLANs at the same time.