Three Rings to the Theory-Kings, with their heads in the sky. Seven for the Systems-Lords, in their halls of code. Nine for the mortal MEng’s, doomed to graduate. One for the SDN Lord, on his control plane throne. In the land of Datacenters where network cables lie. One Path to rule them all. One Path to find them. One Path to bring them all, And in the darkness bind them. In the land of data centers where network cables lie.