This white paper illustrates how the Cisco Application Centric Infrastructure (ACI) can be implemented as a single fabric stretched between two data centers, with the ability to optimally route traffic to and out of the data center where the resource is located.
https://www2.wwt.com/stretched-active-active-aci-fabric/white-paper-stretched-active-active-aci-fabric/
The paper is result of the partnership between WWT and Cisco Systems in developing solutions for the next generation of data centers.
