You are looking to increase bandwidth and add redundancy to a link. You do not have the budget to incur additional costs to add to or make hardware upgrades. What protocol allows you to accomplish those goals using logical means?
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Link aggregation control protocol (LACP) allows multiple physical links to act as a single logical link. This creates redundancy with the link staying active as long as a single physical aggregated link is still active and increases bandwidth with each additional link added.
Wikipedia
In computer networking, link aggregation is the combining (aggregating) of multiple network connections in parallel by any of several methods. Link aggregation increases total throughput beyond what a single connection could sustain, and provides redundancy where all but one of the physical links may fail without losing connectivity. A link aggregation group (LAG) is the combined collection of physical ports.
Other umbrella terms used to describe the concept include trunking, bundling, bonding, channeling or teaming.
Implementation may follow vendor-independent standards such as Link Aggregation Control Protocol (LACP) for Ethernet, defined in IEEE 802.1AX or the previous IEEE 802.3ad, but also proprietary protocols.
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