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Multi-chassis link aggregation group
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<p>A multi-chassis link aggregation group (MLAG or MC-LAG) is a type of <a href="/facts/Link_aggregation_group/3BE3qHDT">link aggregation group</a> (LAG) with constituent ports that terminate on separate chassis, primarily for the purpose of providing redundancy in the event one of the chassis fails. The IEEE 802.1AX-2008 industry standard for link aggregation does not mention MC-LAG, but does not preclude it. Its implementation varies by vendor; notably, the protocol for coordination between chassis is proprietary. </p>