As data center networks have grown to encompass thousands of devices, existing network architectures have proven inadequate for rapid deployment of applications and unable to keep up with the agility requirements of today’s business environment.
Software Defined Networking (SDN) has been promoted as the solution for dynamically provisioning and automatically configuring network resources as applications are deployed. Recently SDN has moved beyond theory to practical reality, as open standards and growing interoperability among vendors are driving rollouts of new capabilities.
Evolving to an Application Centric Infrastructure
With ACI Cisco envisions a distributed, policy driven approach to SDN that relies on the concept of declarative control. “Declarative control dictates that each object is asked to achieve a desired state and makes a promise to reach this state, without being told precisely how to do so,” according to Cisco. As a result, “underlying objects handle their own configuration state changes and are responsible only for passing exceptions or faults back to the control system. This approach reduces the burden and complexity of the control system and allows greater scale.”
