OPEN DATA CENTER ALLIANCE Master USAGE MODEL: Software-Defined Networking Rev. 1.0 - OPEN DATA CENTER ALLIANCE Master USAGE MODEL: Software-Defined Networking

Traditional networking architecture, which is tightly coupled with network interface identity, has been based on the principles of autonomous systems. As a proven networking model, it is simple (with plug-and-play connectivity at lower levels), resilient, and scalable. However, this architecture makes certain vital needs more difficult to achieve and administer in a straightforward, consistent way, including security, network segmentation into logical groups, access control, and quality of service (QoS) across network infrastructure. Also, since data packets can take independent routes, applications such as audio and video do not perform well without modifications to control flow and performing such complex procedures as packet sequencing. The key problem is that the network topology and identity of devices are simultaneously defined by the devices’ network addresses. Networking software has evolved over several decades in a decentralized, monolithic manner, with the code embedded into network devices. Not all network functionality, however, need be distributed, and certain services can be more easily specified and managed if control at the autonomous network level is centralized. Migrating the level and locus of control across a network lets network operators specify network services without having to create specifications for each physical network interface and component that can be
present in a network infrastructure. The emerging principles of SDN address this need.
Indications point toward rapid SDN adoption in cloud data centers. SDN technology also offers promising opportunities for high-throughput, high-volume applications, such as big data deployments in the financial and scientific sectors. To improve evaluations and decision making, IT departments and cloud subscribers will require standard features and defined metrics. The Open Data Center Alliance (ODCA) recognizes the need for the adoption of SDN in infrastructure as a service (IaaS) and management solutions that incorporate standard mechanisms to enable better management of network services. This usage model specifies actions and processes to advance development of practical solutions that seek to lower management complexity and costs, especially in heterogeneous, multi-vendor environments.
This document serves a variety of audiences. Business decision makers seeking specific solutions and enterprise IT groups involved in planning, operations, and procurement will find this document useful. Solution providers and technology vendors should benefit from its content to better understand customer needs and tailor service and product offerings. Standards organizations should find information that helps define open standards relevant to end users.