What is Eth-Trunk for S series switches

Eth-Trunk, also called link aggregation, is a technique that bundles multiple physical links to a logical link to increase link bandwidth. For relevant protocols and standards, see IEEE 802.3ad.
As the network scale expands increasingly, users pose increasingly higher requirements on the bandwidth and reliability of backbone links. Traditional technologies often use high-speed cards or devices supporting high-speed interface cards to increase the bandwidth. This method, however, is costly and inflexible.
Link aggregation bundles multiple physical interfaces into a logical interface to increase the bandwidth without upgrading the hardware. In addition, link aggregation adopts the link backup mechanism to improve reliability of the links between devices.
Link aggregation has the following advantages:
1. Increase bandwidth. The maximum bandwidth of a link aggregation group is the sum of bandwidth of the member interfaces.
2. Improve reliability. When a link fails, traffic is automatically switched to other member links. This ensures reliability of the link aggregation group.
3. Achieve load balancing. A link aggregation group can balance load among active member links.

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