If I setup a 2x 1Gig ports with link aggregation, will I get 2Gigs bandwidth or less? how less?
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That depends. If it is done correctly, each flow would get a maximum of 1 Gbps, but with multiple flows, you will be able to use the full 2 Gbps.
Some people, on some equipment, can, and will, configure round-robin balancing, but that leads to problems like out-of-order packet delivery, which can completely kill real-time applications, and it can actually degrade your performance to less than 1 Gbps per flow..
Correctly done, you use a hash algorithm to determine which flow gets which member interface. This will limit a single flow to a percentage (possibly 100% on a lightly used link) of a single link in the channel. This will average out to using the whole 2 Gbps of the channel with multiple flows.