Design And Implementation Of A Distributed Collaborative Multippoint Concurrent Test System

Loop-back Test Method-LTM and Transverse Test Method-TTM have been designated as the two standard test methods for testing OSI Relay/intermediate system by ISO/IEC IS9646. With the development of network technology, the path table, the capacity of the switching table and the input/output ports of the network equipment on the number of exponentially growing. Both methods can only be simulated on a "port pair" the work truth, when the multiple ports all works that the data packets forwarding, it can't simulated, also lack of the control for multi-port concurrent test data. At the same time, for the needs of the entire network performance monitoring and evaluation and improve of network performance, take the communication subnet or local testing and evaluation as a whole is an important area and demand of the network performance. In this case, to evaluate the defined of the viewing area with the subnet can be seen as to evaluate the "super-network element equipment" that have a lot of input and output ports.The rapid development of network technology makes network testing techniques always lagging behind, many stand-alone architecture test equipment can configure more than one test port and layout this test system in a number of test points to achieve cooperation for the network equipment and the communication subnet, but the testing process lack of the current data test and the unified management, test accuracy and scalability are also limited. Accordingly, the laboratory is committed to concurrent network test system and achieved great results. According to the problem of the network test existence and learn from the research experience of the laboratory, designed and implemented the system of Coordinated Multi-Point Concurrent-Tester-(CMPCTester) and proposed the method of the test for the key network performance parameters.CMPCTester can test and evaluation the performance of the communication subnet that been defined the scope or as the basis to improve the network performance. CMPCTester able to adapt to testing and evaluation the local performance of the communication subnet that has been built and running, including the core equipment testing of the network, so to make quantifiable performance assessment and prediction for the entire subnet of communication. CMPCTester consists of two modules, one is CMPC-TM(Collaborative multi-concurrent test management referred to as TM),the other is DTC(direct test controller),TM does not have the testing capability of the network, primarily responsible for the management of the direct test controller, including establish the new test task, choose and control the number of test points, formulate of the test case, analysis the test results and so on. DTC process the control,test information from the TM. Different test packets inject into the subnet of communication to observing its external behavior and calculate the corresponding performance index. Finally, on the base of the multi-concurrent test platform, conduct concurrent test and analyzed of the results on two network performance parameters of the end-to-end network bandwidth and the one-way delay. And verify the practicality of the test system and the feasibility of the test solution, the measurement accuracy of the one-way delay reached the level of "μs".