Milan Technology MIL-SM2401M-STK - Manual (Page 163)

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7-4-5. Trunking
The Link Aggregation Control Protocol (LACP) standardized means for
exchanging information between Partner Systems on a link to allow their Link
Aggregation Control instances. To reach agreement on the identity of the Link
Aggregation Group to which the link belongs, move the link to that Link
Aggregation Group, and enable its transmission and reception functions in an
orderly manner. Link aggregation allows grouping of up to eight consecutive
ports into a single dedicated connection. This feature can expand bandwidth to
a device on the network. LACP operation requires full-duplex mode. For
more detailed information refer to IEEE 802.3ad.
If there are two trunk groups A and B, and B group is enabled LACP, and then it
will act as a redundant link (Backup group for Trunk group A). If trunk group A
fails, Group B will be its backup.