Milan Technology MIL-SM2401MAF - Manual (Page 105)

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[Note] Before set LACP support, you have to set trunk group on the Trunk
Configuration.
LACP Working Ports configuration interface
LACP State Activity
1. Select <Edit>
2. Use “Space” key to select the Port State Activity.
Active: The port automatically sends LACP protocol packets.
Passive: The port does not automatically send LACP protocol packets, and
responds only if it receives LACP protocol packets from the opposite device.
3. Select <Apply>.