Distributed Multi-Link Trunking (DMLT) or Distributed MLT is a Nortel protocol designed to enhance the Multi-Link Trunking (MLT) protocol. DMLT allows the ports in a trunk (MLT) to span multiple units of a stack of switches or to span multiple cards in a chassis, preventing network outages when one switch in a stack fails or a card in a chassis fails.
United States Patent 6496502