Not sure how many people have heard of Avaya's Fabric Connect, but this was the tech used for the Olympics:
http://www.ashtonmetzler.com/Avaya%27s%20VENA%20Fabric%20Connect.pdf
SPB is pretty much Avaya's bread and butter, a L2 overlay technology essentially with some addons the other L2 overlays don't have, including native Multicast (With true multipath capabilities) and its own MPLS behavior (Not using MPLS tags). In addition, it uses I-SIDs for L2 isolation rather than VLANs, spanning up to 16,000,000 like VXLAN. As any L2 overlay, it uses IS-IS and its special TLVs to provide control plane information. The coolest part, aside from their Identity Engines stuff? Once you have the core setup, most all configurations are done at the edge. I know this is new to all the skeptics, but I'll let you know my experience as this is the way my company is steering right now. Some of it at least.