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Cisco® Application Centric Infrastructure (Cisco ACI™) in the data center is a holistic architecture with centralized automation and policy-based application profiles. Cisco ACI provides a robust transport network for today's dynamic workloads. Cisco ACI is built on a network fabric that combines time-tested protocols with new innovations to create a highly flexible, scalable, and resilient architecture of low-latency, high-bandwidth links. This fabric delivers a network that can support the most demanding and flexible data center environments. The Cisco ACI fabric is designed from the foundation to support emerging industry demands while maintaining a migration path for architecture already in place. The fabric is designed to support the industry move to management automation, programmatic policy, and dynamic "workload-anywhere" models. The Cisco ACI fabric accomplishes this with a combination of hardware, policy-based control systems, and software closely coupled to provide advantages not possible in other models. The Cisco ACI fabric consists of three major components: - Cisco Application Policy Infrastructure Controller (APIC)
- Spine switches
- Leaf switches
These three components handle both the application of network policy and the delivery of packets. Cisco Nexus® 9000 Series Switches support Cisco ACI, and organizations can use them as spine or leaf switches to take full advantage of an automated, policy-based, systems management approach. The Cisco Nexus 9300 platform leaf switches for Cisco ACI are fixed-port switches designed for top-of-rack (ToR) and middle-of-row (MoR) deployment in data centers that support enterprise applications, service provider hosting, and cloud computing environments. These Layer 2 and 3 nonblocking switches support 10 and 40 Gigabit Ethernet and Fibre Channel over Ethernet (FCoE) with up to 2.56 terabits per second (Tbps) of internal bandwidth. | 
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