Dynamic Routing Mechanism in Network Simulation Based on Topology Perception Time Series

摘要

A fundamental requirement for any routing mechanism in network simulation is to truly reflect the forwarding process of packet from source to destination in the simulated topology. In current network simulators, all the nodes know the information instantaneously when the topology changed, which is obviously unrealistic, serious time distortion problem existed. Analyzed the static neighbor index vector mechanism, an abstract model of dynamic routing was presented, and an approach was proposed to compute the time needed for each node to know the topology changes. Dynamic routing lookup algorithm was designed, which maintained static routing table and a message queue of topology changes, and lookup routing states according to the perception time of topology changes, reduced the time consumption during route calculation. Experimental results show that our approach can improve the realism of dynamic routing in network simulation, and with high simulation efficiency.