If you plan to use a link aggregation, consider defining a policy for outgoing traffic. This policy can specify how you want packets to be distributed across the available links of an aggregation, thus establishing load balancing. The following are the possible layer specifiers and their significance for the aggregation policy:
L2 – Determines the outgoing link by hashing the MAC (L2) header of each packet
L3 – Determines the outgoing link by hashing the IP (L3) header of each packet
L4 – Determines the outgoing link by hashing the TCP, UDP, or other ULP (L4) header of each packet
Any combination of these policies is also valid. The default policy is L4. For more information, refer to the dladm(1M) man page.