On the deployment of AQM algorithms in the internet

Authors:
Pawel Mrozowski;Andrzej Chydzinski
Affiliations:
Silesian University of Technology, Institute of Computer Sciences, Gliwice, Poland;Silesian University of Technology, Institute of Computer Sciences, Gliwice, Poland
Venue:
MMACTEE'09 Proceedings of the 11th WSEAS international conference on Mathematical methods and computational techniques in electrical engineering
Year:
2009

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Abstract

The active queue management algorithms for packet queueing in Internet routers have proven to be beneficial in terms of queue size and delay reduction. Before the wide deployment of the AQM in the Internet it should be checked first if it is beneficial to implement an AQM algorithm on only one router in a large network, composed of many bottlenecks and routers. It is also important to check whether an AQM algorithm implemented on several routers simultaneously can lead to undesired performance degradation, through mutual interactions of several AQM routers. In this paper we try to answer these questions using the newest traffic models designed to AQM testing and a network topology that consists of four routers and three bottleneck links. Comparing the performance of five queue management algorithms in three cases: (a) no AQM in the network, (b) AQM implemented on one router only, (c) all routers use the same AQM, we show that usage of AQM improves the average network performance, no matter if AQM is implemented on one router or on all routers. However, in some specific scenarios implementing an AQM algorithm on one router may lead to performance degradation on other, non-AQM routers.