USAGE OF OPNET SIMULATION TOOL FOR VALIDATION OF ROUTING IN ATM BACKBONE NETWORKS OF TACTICAL COMMUNICATION SYSTEMS

摘要

In the article there have been presented issues related to dynamic routing in ATM backbone networks, which are part of tactical communication systems of new generation. There has been characterized tactical communication system, which is being designed in MCI as well as rules of using ATM technique and necessity of using virtual switched connections and dynamic routing. Moreover there have been described main features of PNNI - routing protocol that meets imposed requirements. There have been specified initial rules of dividing ATM backbone network into routing domains to limit the number of non-user traffic sent in the network and decrease the load of the radio relays with this kind of traffic. Based on exemplary topology of the system, in OPNET software there has been built simulation model, which was used to verify the accuracy of the proposed division into peer groups. Results captured in particular experiments have been presented. A special attention was paid to the amount of information sent in the network in case of "flat" network and network divided into routing domains.