OPNET学习笔记之application demands

    当仿真研究关注的不是某些产生流量的应用程序时，采用application demands可以更简单的实现网络中的流量，它依据速率和规模产生在节点之间的流量。配置application demands比配置application traffic models更简单，因为所有的配置都集中在application demands自己，不需要配置节点；而application traffic models则需要配置application和节点。

    application demands把流量看成是在节点之间一系列的请求/相应过程。它的缺点是与application traffic models相比，不支持某些属性，如表所示：

Table 10-2 Feature Comparison of Application Demands and ApplicationModels 

Feature	Application Demands	Application Models
Models individual requests and responses sent by the application	yes	yes
Traffic Mix attribute to model traffic as analytic, discrete, or hybrid traffic	yes	yes—voice and video conferencing no—all others
Detailed configuration for application-specific parameters	no	yes
Global statistics for response time, traffic sent, and traffic received	no	yes
Object statistics for response time, traffic sent, and traffic received	yes	yes

    当配置application demands时可以逐条手工配置，对特别的，如full mesh，或所有节点都与某个节点需要配置，可以在protocols->Applications > Deploy DES Application Demands中配置。