Avoiding Oscillations Due to Intelligent Route Control Systems
Intelligent Route Control (IRC) systems are increasingly deployed in multihomed networks. IRC systems aim to optimize the cost and performance of outgoing traffic, based on measurement-driven dynamic path switching techniques. In this paper, the authors first show that IRC systems can introduce sustained traffic oscillations, causing significant performance degradation instead of improvement. This happens, first, when IRC systems do not take into account the self-load effect, i.e., when they ignore that the performance of a path can change after additional traffic is switched to that path. Second, oscillations can take place when different IRC systems get synchronized due to significant overlap of their measurement time windows.