3ad link aggregation enables you to group Ethernet interfaces to form a single link layer interface, also known as a link aggregation group (LAG) or bundle. The LAG balances. An aggregate interface group uses IEEE 802. An aggregate group increases the bandwidth between peers by load balancing traffic across the. Port aggregation allows you to group multiple physical ports into one unit. Port aggregation is useful for implementing load balancing and provides a redundant link backup. 212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U. For LAG control, the FortiSwitch unit supports the industry-standard Link Aggregation Control Protocol (LACP).