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Link aggregation combines multiple physical network connections (such as Ethernet cables) into a single logical connection. This logical link is commonly referred to as a Link Aggregation Group (LAG), also known as EtherChannel or Binding Link. The main target of Ethernet switch link aggregation is as follows:

1. Increase bandwidth

The most direct benefit of link aggregation is higher switching bandwidth. Due to the limited capacity of a single physical link, bundling multiple links together will exponentially increase the available bandwidth. For example, aggregating four 1gbps links theoretically can provide a total bandwidth of 4Gbps.

2. Improve reliability

If a physical link fails, traffic will be automatically redirected to other functional links to ensure continuous network communication. This redundancy enhances the reliability and stability of the network.

3. Load balancing

Link aggregation distributes network traffic evenly across multiple physical links, thereby preventing congestion on any individual link. This optimizes bandwidth utilization and improves overall transmission efficiency.