Definition
Ethernet link aggregation, also called Eth-Trunk, bundles multiple physical links to form a logical link to increase link bandwidth. The bundled links back up each other, increasing reliability.
Purpose
As the network scale expands increasingly, users propose increasingly high requirements on Ethernet backbone network bandwidth and reliability. Originally, to increase the bandwidth, users use high-speed cards or devices supporting high-speed interface cards to replace old interface cards or devices. This solution, however, is costly and inflexible.
Link aggregation helps increase bandwidth by bundling a group of physical interfaces into a single logical interface, without having to upgrade hardware. In addition, link aggregation provides link backup mechanisms, greatly improving link reliability.
Link aggregation has the following advantages:
Increased bandwidth
The bandwidth of the link aggregation interface is the sum of bandwidth of member interfaces.
Higher reliability
When an active link fails, traffic on this active link is switched to another active link, improving reliability of the link aggregation interface.
Load balancing
In a link aggregation group (LAG), traffic is load balanced among active links of member interfaces.
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