Extreme 9920 software supports Dynamic (LACP) LAG types.
Dynamic LAG uses link aggregation control protocol (LACP) to dynamically aggregate links.
Two partner systems sharing multiple physical Ethernet links can aggregate a number of physical links using LACP. LACP creates a LAG on both partner systems and identifies the LAG by the LAG ID. All links with the same administrative key, and all links that are connected to the same partner switch become members of the LAG. LACP continuously exchanges link aggregation control protocol data units (LACPDUs) to monitor the health of each member link.