![]() The bars in the diagram represent groups of network devices which provide redundancy and high bandwidth connectivity. The following diagram demonstrates that the datacenter network is constructed by different tiers of network devices. All paths between different tiers are active to provide high redundancy and bandwidth using Equal-Cost Multi-Path (ECMP) Routing. On the control plane, all network devices are running as OSI model Layer 3 routing mode, which eliminates the historical issue of traffic loop. These devices are strategically located in different physical locations with separate power and cooling domain to reduce impact of an environment event. The network is constructed using a large number of commodity devices to reduce the impact caused by individual hardware failure. ![]() The datacenter network is a modified version of a Clos network, providing high bi-sectional bandwidth for cloud scale traffic. Let’s illustrate the resiliency design principle using datacenter network. The redundancy is designed and built into the network from the physical aspect all the way up to control protocol. The above network components are designed to provide maximum availability to support always-on, always-available cloud business.
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