HotOM: A SDN based network virtualization for datacenters

Datacenters are in a process of a huge shift by the deep adoption of virtualization. To be economically doable, virtualized datacenters must reach a high level of resource utilization by simultaneously hosting as many tenants as possible. Traditional network virtualization techniques do not scale to accomplish those requirements. Furthermore, new demands are arising like programmable networks leveraged by the Software-Defined Networking (SDN) paradigm. This paper introduces HotOM, a network multi-tenancy approach to overcome traditional limitations through redefining a L2 header purpose and introducing a new L2.5 shim protocol, preserving legacy network core's device. Functional explanation and evaluations were done to support the proposal.