The Cisco Application Policy Infrastructure Controller (APIC) is a distributed system implemented as a cluster of controllers. The Cisco APIC provides a single point of control, a central API, a central repository of global data, and a repository of policy data for the Cisco Application Centric Infrastructure (ACI). Cisco ACI is conceptualized as a distributed overlay system with external endpoint connections controlled and grouped through policies. Physically, Cisco ACI is a high-speed, multipath leaf and spine (bipartite graph) fabric.