Christopher Hart (don’t know the guy personally) posted a great thread on Twitter recently, and it’s also available in blog form, shared here. A great rundown of why a portchannel/LAG made up of two 10G links is not the same as a 20G link, which is a commonly held misconception about link aggregation.
Key point is that you’re adding lanes to the highway, not increasing the speed limit. Link aggregation is done for load balancing and redundancy, not throughput - the added capacity is a nice side benefit, but not the end goal.
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