American Fibertek SM9p - Manual (Page 71)

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Trunk Configuration – Aggregator Information interface
State Activity
When you had setup the LACP aggregator, you can configure port state activity. You can
change the port state activity to Active or Passive.
1. Active: The port automatically sends LACP protocol packets.
2. Passive: The port does not automatically send LACP protocol packets, and responds
only if it receives LACP protocol packets from the opposite device.
[NOTE]
a. A link having either two active LACP ports or one active port can perform dynamic
LACP trunking.
b. 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.