The most commonly used LAGG protocol. This mode supports IEEE 802.3ad
Link Aggregation Control Protocol (LACP) and the Marker Protocol. In LACP
mode, negotiation is performed with the switch – which must also support
LACP – to form a group of ports that are all active at the same time.
This is knowns as a Link Aggregation Group, or LAG. The speed and MTU of
each port in a LAG must be identical and the ports must also run at full-
duplex. If link is lost to a port on the LAG, the LAG continues to
function but at reduced capacity. In this way, an LACP LAGG bundle can
gain both redundancy and increased bandwidth.
Traffic is balanced between all ports on the LAG, however, for
communication between two single hosts it will only use one single port at
a time because the client will only talk to one MAC address at a time. For
multiple connections through multiple devices, this limitation effectively
becomes irrelevant. The limitation is also not relevant for failover.
In addition to configuring this option on pfSense, the switch must enable
LACP on these ports or have the ports bundled into a LAG group. Both sides
must agree on the configuration in order for it to work properly.