UNICOM Electric 8 - Manual (Page 50)

5-4-5-2. Aggregator Information
When setting an LACP aggregator, view relational information here.
5-4-5-3. State Activity
Active (selected): The port automatically sends LACP protocol packets.
Passive (not selected): The port does not automatically send LACP
protocol packets and responds only if it receives LACP protocol packets
from the opposite device.
1. A link having either two active LACP ports or one active port can
perform dynamic LACP trunking. A link with two passive LACP ports
will not perform dynamic LACP trunking because both ports are
waiting for an LACP protocol packet from the opposite device.
2. If you are an active LACP actor, when you select trunking port the
active status will be created automatically.