What is the "link aggregation" feature of a switch?

Link Aggregation (linkaggregation) is the "bundle" of physical link sections with the same transport media type, the same transmission rate, logically looking like a link. Link aggregation, also known as a relay (trunking), allows peer-to-peer physical links between switches or between switches and servers to multiply bandwidth at the same time. Therefore, it is an important technology to increase the bandwidth of the link, to create the transmission elasticity and redundancy of the link.

The aggregated link is also known as the Trunk Line (trunk). If a port in the trunk is blocked or faulted, the packet is allocated to other ports in the trunk for transmission. If this port is returned to normal, the packet will be reassigned to all working ports in the trunk for transmission.