The traditional data center computing network is composed of access layer, convergence layer and core layer, with North-South traffic as the main part. The traditional network structure supports various types of data centers for a long time. However, with the rapid growth of new applications and data volume, the scale of data centers is expanding, and the requirements for network architecture are also increasing. East-West traffic has gradually become the mainstream mode in data centers. Therefore, a new network topology structure, leaf-spine (leaf ridge) structure, has emerged in data centers.

With the increase of the number of computers and the expansion of network scale, in more and more LAN environments, network switches have replaced hubs, and the interconnection of multiple network switches has replaced single network switches. In the LAN environment of multi-network switches, cascade, stack and cluster of network switches are three important technologies. Then, how to connect network switches to maximize the reliability of network switches? Next, this paper will show the best interconnection mode of network switches by explaining the differences between stacking, cascading and clustering of network switches.

Cumulus Linux is an open network operating system, in all its functions, "automation" is an important and unique existence, especially when operating through the automated operation and maintenance tool Ansible. So what is "automation" in Cumulus Linux? What is Ansible and can it match the "automation" in Cumulus Linux perfectly? Reading this article, you can find the answer, and at the same time, you can learn the detailed steps of how to implement Cumulus Linux automation application through Ansible from the examples shown in this article.

The new generation of OTN (Optical Transport Network) technology is developed on the basis of the original transport network. OTN is based on WDM technology and introduces the powerful operation, maintenance, management and assignment (OA) capabilities of SDH on the basis of super-large transmission capacity. At the same time, it makes up for the deficiency of SDH's function and maintenance management overhead when facing the transport layer. OTN inherits the dual advantages of SDH and WDM, and can avoid the emergence of a series of problems in traditional systems. At present, OTN has become the most widely used data transmission service technology for broadband customers.