Research On Clos Network Multicast Switching And Energy-Saving Technology Based On MSM Structure

Along with the development of society as well as science and technology, internet services have been applied in various fields. And the information flow-mate in network increases rapidly because of the speed development of internet technology, bringing challenges to internet technology. Router and switch, the switching node of web information, have been an important element influencing network performance, and the study on switching node becomes increasingly important to improve the network performance. Nowadays, the wildly applied software such as distance education, video conference, IPTV and on-line game cannot do without multicast technology, and increasing demands of multicast technology occur in network, thus the study on multicast technology of switching node values much.This paper studies the multicast switching and energy-saving technology based on MSM structure. Firstly, some basic knowledge of switching facility and technology are introduced and then the common switch network architecture, cache settings of switch fabric, and some mature multicast scheduling are presented, and at last a Clos network multicast scheduling algorithm based on MSM structure is put forward and energy-saving is operated on Clos network on the basis of the algorithm.(1) An algorithm of Clos network multicast scheduling based on MSM structure is put forward. The first and third rank have input buffer with queue structure based on address copy, relieving congestion in multicast scheduling. Three parts are included in this algorithm: the match scheduling of the first rank, the second rank and the third rank. In the process of match scheduling, the setting of weight is of great importance, which should avoid conflicts when multicast cell forwarding in the output port of the intergrade. Thus multicast orthogonal routing method is adopted and orthogonal shunt priority coding is designed to avoid the conflicts of intergrade in the output port. In the end, emulation tests of OPNET are used to test this algorithm for validity.(2) Energy-saving multicast scheduling strategy of Clos network based on MSM structure is put forward. This strategy controls the switch of intergrade by testing the average parameter of queue length: an intergrade module is opened when the average queue length is greater than the opening threshold value in continuous several time slots; and an intergrade module is closed when the average queue length is smaller than the closing threshold value in continuous several time slots. The opening and closing threshold value vary with the amount of the intergrade. And four energy-saving algorithms are put forward on the basis of the energy-saving scheduling strategies and the performance of these algorithms is tested by simulation experiments.