Two Load-balanced Switch Key Technology Research

With continuously rapid development of Internet services, the technology ofterabit router has become the highlight of researchers of IT industries andacademies. As a core technology of terabit router, a new switch fabric is neededto meet the requirement of capacity, salability and reliability. Recently theload-balanced switch is introduced. The switch is scalable and can guarantee afull capacity and delay. The load-balanced switch includes two-stage. The firstload-balancing stage connects inputs and intermediate inputs, spreads arrivingpackets equally among intermediate inputs. The second switching stage connectsintermediate inputs and outputs, transfers packets to the outputs. Theload-balanced switch does not use any centralized scheduler. Therefore, it canscale while providing the switching performance needed by network operaters.In the thesis, I first introduce the basic architecture of load-balanced switchand analyze the switching performance of the switch. While current routerscommonly need switch fabrics with fast reconfiguration times, I show how toimplement the load-balancing and forwarding stages of the load-balanced switchusing a single passive optical switch fabric with no configurations. And I discussthe key technologies about the implementation of the load-balanced switch.In addition, with the requirements of Qos in different operations in network,multiple priority queues must be adopted in the load-balanced switch. Currentlythe research about the load-balanced switch is focused on no-priority traffic. Thethesis analyses throughput and mean delay of the load-balanced switch withmultiple priorities in preemptive priority queueing strategy. The performance ofconsidered approaches is derived by theoretical analysis and computersimulations. Meanwhile, a problem with the load-balanced switch is that differentpackets of the same flow can take different paths, possibly leading to packetsreordering. In the thesis, I propose an algorithm called FFS (Full Frame Stuff),which maintains packet order in the two-stage load-balanced switch and hasexcellent switching performance (in terms of mean delay and throughput).Thisalgorithm is distributed and each port can operate independently. In the following,the scheme of the simulation experiment is presented, and the OPNET-basedsimulation model is described. Finally, I conclude my research work on the...