【作者】 陈华伟；

【导师】 曾华燊；

【作者基本信息】 西南交通大学 ， 计算机应用技术， 2007， 硕士

【摘要】 本硕士论文所反映的研究工作是在四川省网络通信重点实验室的分布式多端口并发测试技术和测试系统的基础上展开的。传统的针对路由器的测试方法，如ISO 9646定义的穿越测试法，已经不能适应多端口并发测试，这种情况促使产生了一种新的测试方法——多端口并发穿越测试法。笔者本论文中的两项主要内容是：多端口路由器并发测试环境中同步机制与数据流生成机制的研究与设计。多端口并发穿越测试法要求各测试部件在物理上分布在不同的位置，这就相应地要求同步机制能够协调各测试部件以保持测试同步。另外，现存的没有同步机制的测试例也要求能够很好地用于测试系统。为此，笔者在测试例的所有测试树节点上插入同步点或空的同步点，在编译时把所设计的相应的同步代码段加入到相应的位置；对于没有设置同步机制的已有TTCN-3测试例，编译器编译时在各测试树节点上加入空同步点，从而达到对已有测试例的重用。为了模拟性能测试时真实的网络数据环境，有时需要产生满足一定数据到达规律的数据流，把其作为被测路由器端口的数据输入。长期的观察结果表明，网络数据流的分布规律具有自相似性，因此，笔者就以自相似到达规律为基础，设计性能测试需要的数据流生成机制。基于自相似的数据流生成设计模式也给其它类型数据流生成设计提供一种通用模式，这对以后测试系统数据流生成的扩展提供了很大的帮助。基于同步和测试数据流生成的测试实验表明，笔者所设计的两种机制是可行的，对四川省网络通信重点实验室的分布式多端口并发测试系统提供了较好的支持，为整个项目的开发做出了一定的贡献。更多还原

【Abstract】 The background of the research work presented in this MSc dissertation is multi-port-router testing techniques and test system development at SC-Netcom Lab (Sichuan Network Communication Technology Laboratory). The inadequacy of existing test method for routers (such Transverse Test Method defined by ISO 9646) in handling multi-port concurrent testing, has led to a new test method called MPC-TTM (Multi-Port Concurrent Transverse Test Method).This thesis focuses on issues of synchronization and traffic pattern generation in multi-port router concurrent testing environment. The MPC-TTM enables test components to be physically distributed, which, in turn, demands synchronization mechanisms to coordinate behavior among components. Better still, existing test cases without synchronization mechanisms can be fully utilized. The author has solved the problem by unexceptionally inserting synchronization points to all the nodes in the test tree of a test case with a synchronization statement (null or real) during test case compiling. During multi-port test compiling, appropriated synchronization statement can be added to relevant test cases in TTCN-3 without synchronization settings from the TTCN-3 test case library.To simulate the real network traffic patterns in performance testing, there is a need to generate appropriate traffic as input to the RUT (Router Under Test) with certain types of coordination among all ports whenever necessary. In view that long term monitoring results have shown the self-similar nature in network traffic, the author has deliberately chosen such pattern for his experiment of traffic generation. Similar mechanisms can be applied to other traffic pattern generation although no further experiment with other types of traffic has been carried out this author’s work.Experiments with synchronization and traffic pattern generation have shown that the mechanisms proposed by the author are workable and can be easily adapted to the DMC-TS under development at SC-Netcom Lab.更多还原