ABSTRACT
This chapter explores the Data Centers of financial services companies and carriers as examples to explain the evolution process and network architecture of Data Center Networks (DCNs), and summarize DCN design principles for financial services companies and carriers. It describes how the architecture evolves. The three-layer network architecture is widely used on legacy DCNs because of its simple implementation, small configuration workload, and strong broadcast control. The Clos architecture provides an easy to expand method for constructing a large non-blocking network without depending on hardware specifications of devices. Although the spine-leaf architecture provides the topology basis for a non-blocking network, a suitable forwarding protocol is required to fully utilize capabilities of the topology. The DCN connects to the cloud platform through software-defined networking to implement an automated, software-based, and resource-based network. The chapter examines Multichassis Link Aggregation Group implemented on Huawei CloudEngine switches as an example to describe the working principles of multi-chassis link aggregation technologies.
