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A major staple of layer 2 has long been the combination of flood-and-learn Ethernet switches with some variant of the Spanning Tree Protocol. However, STP has significant shortcomings -chiefly, that it throws away network capacity by removing links, and that it can be relatively slow to reconverge after topology changes. In recent years, attempts to rectify these shortcomings have been made by either making L2 look more like L3 (notably TRILL and SPB, which both incorporate L3-like routing) ordoi:10.1145/2934872.2934877 dblp:conf/sigcomm/McCauleyZJRRS16 fatcat:tvbhp7x2abcbjci4jwybdlipbe