42 AT-IFS802SP-80 User Manual
Port Control interface
6.15 Port Trunk
Port trunking is the combination of several ports or network cables to expand the connection speed
beyond the limits of any one single port or network cable. Link Aggregation Control Protocol (LACP),
which is a protocol running on layer 2, provides a standardized means in accordance with IEEE 802.3ad
to bundle several physical ports together to form a single logical channel. All the ports within the
logical channel or so-called logical aggregator work at the same connection speed and LACP operation
requires full-duplex mode.
System Priority• : A value which is used to identify the active LACP. The switch with the
lowest value has the highest priority and is selected as the active LACP peer of the trunk
group.
Group ID• : There are 13 trunk groups to be selected. Assign the “Group ID” to the trunk
group.
LACP• :Whenenabled,thetrunkgroupisusing LACP.Aportwhichjoins anLACPtrunk
grouphasto makeanagreement withitsmember portsrst.Please noticethata trunk
group, including member ports split between two switches, has to enable the LACP function
of the two switches. When disabled, the trunk group is a static trunk group. The advantage of
havingtheLACPdisabledisthataportjoinsthetrunkgroupwithoutanyhandshakingwith
its member ports; but member ports won’t know that they should be aggregated together
to form a logic trunk group.

6.15.1 Aggregator setting