If your setup of a trunk aggregation has a switch and the switch supports LACP, you can enable LACP for the switch and the system. See the switch manufacturer's documentation to configure the switch.
LACP enables a more reliable detection method of datalink failures. Without LACP, a link aggregation relies only on the link state reported by the device driver to detect the failure of an aggregated datalink. With LACP, LACPDUs are exchanged at regular intervals to ensure that the aggregated datalinks can send and receive traffic. LACP also detects some misconfiguration cases, for example, when the grouping of datalinks does not match between the two peers.
LACP exchanges special frames called Link Aggregation Control Protocol Data Units (LACPDUs) between the aggregation and the switch if LACP is enabled on the system. LACP uses these LACPDUs to maintain the state of the aggregated datalinks.
Use the dladm create-aggr command to configure an aggregation's LACP to one of the following three modes:
off – The default mode for aggregations. The system does not generate LACPDUs.
active – The system generates LACPDUs at specified intervals.
passive – The system generates an LACPDU only when it receives an LACPDU from the switch. When both the aggregation and the switch are configured in passive mode, they do not exchange LACPDUs.
For information about how to configure LACP, see How to Create a Link Aggregation.