（中兴通讯股份有限公司，中国 深圳 518057）
Data Center Infrastructure and Underlay Protocol Evolution
WEI Yuehua, CHEN Xiao, ZHANG Zheng
(ZTE Corporation, Shenzhen 518057, China)
Abstract: Driven by the scale of computing, the physical topology of the data center has evolved from an access-aggregation-core three-level network architecture to a Clos-based Spine-and-Leaf architecture. The basic unit of computing resources has gone through three stages: physical server, virtual machine, and containerization. The underlay connection protocol of the data center has gradually evolved from layer 2 protocol to IP routing protocol. However, traditional routing protocols have many problems, such as scalability, topology visibility, and automated provision capabilities. The fat-tree routing protocol, which combines link state and distance vector, solves the pain points of ultra-large-scale data center deployment, and is expected to gradually become the mainstream technology for ultra-large-scale data center underlay networks.
Keywords: Spine-and-Leaf; routing; data center