Without link aggregation, connecting two switches with multiple cables creates a loop. STP blocks all but one link, wasting your extra cables. With link aggregation, all cables carry traffic. You get increased throughput because traffic distributes across members. You get fault tolerance because the bundle survives member failures. You avoid STP blocking because the bundle appears as a single link. For uplinks between access and distribution layers, link aggregation is standard practice.
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$ curl repovive.com/roadmaps/network-design/spanning-tree-and-link-aggregation/why-aggregate-links
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