OPNET Implementation of Endpoint Admission Control Algorithms

The history of telephone networks indicates a trend of employing sophisticated switches and dumb hosts. Hence, it is often expensive and difficult to replace switches and add new applications. In contrast, Internet employs simple routers and sophisticated applications in hosts. New applications can be added without requiring infrastructural changes. In order to keep routers simple, there is a growing need for new mechanisms employing end-hosts that provide admission control. In this paper, we describe OPNET implementation of two endpoint admission control (EAC) algorithms. The OPNET EAC model captures basic EAC procedures for network probing and data transmission. We discuss several architectural issues and implementation details. We then describe the packet format and the node and process models of the end-hosts and routers. We also present simulation scenarios based on various traffic sources, traffic loads, probing times, and number of hops.