Improved Channel Selection Strategy Based On Hierarchically Switched Networks

Hierarchically switched technology as a new type of packet switched technology gives a fundamental solution to the Internet's birth defects. In Hierarchically Switched Network(HSNet), sub-domain structure of IP address is associated with the structure of Network hierarchy, and IP itself contains the path information, so the process of delivering an IP data packet to the destination by switches has no longer the meaning of the traditional routing selections, and routers are degenerated into switches. New network topology will be designed according to hierarchy model, and new network address space will be allocated according to hierarchy model, at the same time the hierarchies between topology structure and address structure should have a strict match. So, in this case we can take full advantage of scalability, management easily and high efficiency characteristics of the hierarchy model. It simplifies the routing and addressing functions of the network, and avoids the unreliability inflexibility of the original network, so it meets the requirement of high performance, scalability, and management easily of the future network.In this paper, the topology of HSNet is studied. The main work is as follows:First, after a lot of literatures related to hierarchically switched technology have been read, various classical topologies are classified. Then the channel selection algorithms in various topologies are studied, and the advantages and disadvantages of various types of algorithms are analyzed and summarized.Second, the hardware device can not meet the needs of large load during the transmission process in High-level nodes, so an improved topology model HSNet is proposed, which still uses the tree structure and takes the advantage of matching the original topology with the address message. This model which uses a new method of short-circuit of nodes in the same domain sloves the problem of lager load when transmitting the massive data accross the high-level nodes, and it also reduce the the pressure of high-level nodes in original topology when transmitting data. Third, for the improved topology, in the background of the multiple paths conflict between nodes, according to the characteristic of the match between address and topology, an improved hash function is proposed by the combination of IP address and path weight. Compared with the classical hash algorithm with an improved hash function, my final improved algorithm is given.Fourth, in order to demonstrate the effectiveness of the improved strategy, GT-ITM simulation platform is used to comparing the performance of the original topology structure and the improved topology structure in this paper. It mainly compares the load stability of the network and the delay time rate of data transmission response time between nodes. Through analysis and comparison of simulation results, the evaluation shows that the load of high-level nodes is decreased significantly in the improved topology, and the load balancing of network channel is improved greatly by using the improved strategy.