EIGRP was always described as the only routing protocol that can do unequal-cost load sharing. As it turns out, BGP is another one (although it's way more limited than EIGRP). For example, if you have two links into a neighbor AS, you can load-share across them proportionally to their bandwidth. You can find all the details, sample configurations and router printouts in the CT3 wiki.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.
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