Multi-Chassis Link Aggregation
MLAG enables the network administrator to use all interconnects in an active/active, Layer-2 topology. MLAG and Spanning Tree can work together - ports remain active/active, while STP only kicks in during a misconfiguration. This enables an increase in cross-sectional bandwidth, and faster failover times measured in the 100s of milliseconds for link or nodal failure.
MLAG can work at almost any layer of the network - to interconnect servers in an active/active topology to the leaf layer, or from the leaf layer to the spine/aggregation layer. The MLAG can contain up to 16 ports, providing enough throughput to build very large leaf/spine networks for over 10,000 servers.
Figure: MLAG applications in different layers of the network