TRENDnet TE100 S810Fi - Manual (Page 62)

5-4-5-2. Aggregator Information
When you are setting LACP aggregator, you can see relation information
in here.
5-4-5-3. State Activity
Active (select): The port automatically sends LACP protocol packets.
Passive (no select): The port does not automatically sends 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 has two passive LACP ports will not perform dynamic LACP
trunking because both ports are waiting for and LACP protocol packet
from the opposite device.