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In this video, Keith Barker, covers increasing throughput with EtherChannel. If you're trying to maximize throughput between two devices but you're finding that no matter how many cables and ports you connect, nothing changes, you probably need to use EtherChannel to work around spanning tree.

Trying to increase throughput between two switches by laying several cables will give you good fault-tolerance on that link, but it won't deliver a throughput increase. When spanning tree recognizes parallel links, it treats them as redundant and blocks them, so you need to work around spanning tree's basic functionality. EtherChannel allows you to convert multiple links into one — essentially concealing their true identity from spanning tree so that it doesn't see them as redundant, it sees them as collaborative. Keith demonstrates, live, how to configure the ports so that the three cables you're laying are treated as one pipe, helping ensure that your upstream switch is delivering traffic to the rest of the network as fast as possible.

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