In Onyx, when I configure LACP, I have to set it to on, active or passive mode:
interface ethernet x/x mlag-channel-group y mode [active, passive, on]
While in Cumulus Linux, when you configure LACP, you cannot configure this setting. The documentation only says:
"Cumulus Linux supports IEEE 802.3ad link aggregation mode (802.3ad) and balance-xor mode. The default mode is 802.3ad."