Milan Technology MIL-SME801P - Manual (Page 118)

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5-4-5-3. State Activity
Active (selected): The active port automatically sends LACP protocol
packets.
Passive (not selected): The passive port does not automatically send LACP
protocol packets, but responds only if it receives LACP protocol packets from
the other device.
A link having either two active LACP ports or one active port can perform
dynamic LACP trunking. A link that has two passive LACP ports will not
perform dynamic LACP trunking because both ports are waiting for an LACP
protocol packet from the opposite device.
If the port has active LACP’s, and you select the trunking port, the active