D-Link DES-3018 - Manual (Page 109)

DES-3010F/DES-3010FL/DES-3010G/DES-3016/DES-3018/DES-3026 Fast Ethernet Switch Manual
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allows LACP compliant devices to negotiate the aggregated link so the group may be changed
dynamically as needs require. In order to utilize the ability to change an aggregated port group,
that is, to add or subtract ports from the group, at least one of the participating devices must
designate LACP ports as active. Both devices must support LACP.
Passive - LACP ports that are designated as passive cannot initially send LACP control
frames. In order to allow the linked port group to negotiate adjustments and make changes
dynamically, one end of the connection must have "active" LACP ports (see above).
Click Apply to implement changes made.