Your link aggregation configuration is bound by the following requirements:
You must use the dladm command to configure aggregations.
An interface that has been plumbed cannot become a member of an aggregation.
All interfaces in the aggregation must run at the same speed and in full-duplex mode.
You must set the value for MAC addresses to “true” in the EEPROM parameter local-mac-address? For instructions, refer to How to Ensure That the MAC Address of an Interface Is Unique.