Research On Single-Layer Switching And Multi-Layer Switching

Switching technology can be said to be the core of the new Internet era, with a strong ability of address. It not only solves the problem of intelligent network, but also promotes the development of the Internet work. As the Internet continues to expand and the business volume grows rapidly, multi-layer switching technology developed day after day, for example, three-layer switching, four-layer switching, label switching etc. Internet was not catered for such converged service because of its' complicated three-layer user-data translate platform, low transmission efficiency and absence of QoS insurance. For the very reason, SC-Netcom Lab (Sichuan Network Communication Technology Laboratory) has introduced the Single User-data transfer & switching Platform Architecture Network (SUPANET). The SUPANET simplifies User-data transfer & switching platform (U-platform) into a single physical layer platform by adopting the out-band signaling concept, while keeps existing protocol stacks of Internet in the Signaling & Management platform (S&M-platform) to enable interoperation with Internet. The key technique enabling the single U-platform is called EPFTS (Ethernet-oriented Physical Frame Timeslot Switching). SUPANET provides multimedia traffic with a QoS-insured, connection-oriented transmission service.This paper analyzes the network performance of EPFTS switching technology and multi-layer switching technology. The simulation is focused on the analysis of the transmission delay of user data in the switching node, and the transmission performance of fixed-length frame in multi-layer and single-layer switching. In this paper, first introduce the existing multi-layer switching technology. Using OPNET Modeler, the simulation of optimized the hierarchical structure is taken. Detailed analyzes and compares the multi-layer switching technology and EPFTS about QoS, switching mechanisms, design principles etc. the simulation of the transmission performance of EPF in a single layer and multi-layer is taken, the result further supports the theory EPFTS switching technology about the efficiency of data transmission.This paper presents two simulation programmers of the single-layer switching. The first idea is: on the basis of the existing two-layer switching technology in Ethernet, each application traffic in a "user host" is distributed a virtual MAC. When Ethernet frame is created for an application in data-link layer, its' SOURCE MAC ADDRESS field was filled by the virtual MAC, and a correct virtual path is established by the map table of virtual MAC address. Implement the single switching and multiplexing. The second, according to the characteristics of user data transmission in EPFTS, establish a simulation model of the single-layer switching. In comparing object, increase the encapsulation, de-encapsulation, and look-up of the EPF frame.The author's main contributions can be summarized as:A. Analyze the existing multi-layer switching technology, and simulate the transmission performance.B. On the basis of the existing switching technology in Ethernet, design the simulation programmer of the single layer switching, and simulate the programmer by OPNET.C. According to the characteristics of user data transmission in EPFTS, design the simulation model of the single-layer switching, and compare the transmission performance.