Method of constructing data center switching network and node apparatus

The invention relates to the network and optical switching technical field and provides a method of constructing a data center switching network and a node apparatus. The method comprises the step S1 of selecting a regular polygonal crystal lattice physical topology according to a preset network scale and application demands. Each dot in the regular polygonal crystal lattice physical topology is corresponding to one optical switching node. Each side is corresponding to one or more fibers. The method further comprises the step S2 of acquiring a logical topology complying with small-world network characteristics in line with the application demands according to the regular polygonal crystal lattice physical topology. The logical topology comprises two logical planes. The first logical plane is a regular crystal plane. The second logical plane is a random graph plane composed of random sides. A data center inner switching network constructed through the method achieves any large-scale port number, random expansion and simple wiring. While the method makes a large scale and flexible expansion achieved, the method further guarantees a relatively high Internet bandwidth and a relatively low average time delay between any two servers.