Allied Telesis AT-9000 Series - Manual (Page 122)

Chapter 10: Setting Static Port Trunks
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6. Select the member ports that you want to add to or remove from the
static trunk by clicking on the ports.
Caution
To prevent the formation of network loops in your network topology,
do not remove ports from a static port trunk without first
disconnecting their network cable. Network loops can result in
broadcast storms that can adversely affect network performance.
Note
You cannot have a trunk that contains only one port. There must be
a minimum of two ports in a trunk.
7. Click Apply.
A confirmation message is displayed.
8. Click SAVE.