Virtual Network over TRILL
summary
Gandi.net U.S. R&D builds a production system that uses TRILL plus a VNI tag to turn VLAN limits into 16 million virtual networks and to hide VM MACs inside node-to-node encapsulation. Claims: top-of-rack MAC table pressure drops dramatically, broadcasts and ARP flood are cut, equal-cost multipath improves fault tolerance, and vni convergence stays in-band (dependent on LSP cycle time, roughly a few times that cycle). Deployed in beta; throughput shows a drop (≈6 Gbps native → ~4+ Gbps with TRILL, a bit lower with VNT) attributed to encapsulation overhead on Linux.
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