The Impact of Congestion Control Mechanisms on Network Performance after Failure in Flow-Aware Networks

This paper presents the impact of congestion control mechanisms proposed for Flow-Aware Networks on packet transmission in the overloaded network after a link failure. The results of simulation based analysis show how to set the values of the congestion control parameters in order to decrease the acceptance time of the interrupted streaming flows in the backup link. The research was performed for three congestion control mechanisms, the Enhanced Flushing Mechanism (EFM), the Remove Active Elastic Flows (RAEF), and Remove and Block Active Elastic Flows (RBAEF) in two different cross-protect router architectures, with the PFQ (Priority Fair Queuing) and with the PDRR (Priority Deficit Round Robin) scheduling algorithms. Moreover, the advantages and weaknesses of using the proposed solutions in FAN, considering the effects of a network element failure, are described and analyzed.