Details on how to set up either LACP or crappy Cisco EtherChannel are documented here in the freebsd handbook. Also worth mentioning is the lagg device man page. Link aggregation is also incorrectly referred to as 'trunking', which is of course the exact oppose of link aggregation in that multiple VLANs share the same physical link (a link aggregate group can also be a trunk). The Intel term 'teaming' also is in common use, although seems to refer to using multiple network cards without help from the switch. The linux term 'bonding' refers to the linux drivers which implement a number of multi-nic configurations, some with switch assistance, others without.