CRED: Active Queue Management for Fairness

Abstract

Active Queue Management (AQM) algorithms. which are used in intermediate routers, try to prevent network congestion by randomly dropping packets. One problem with most AQM schemes is that they cannot enforce fairness. In other words, they do not have the ability to control how to divide the available bandwidth amongst flows. This may cause an unresponsive or aggressive flow to monopolize the bandwidth usage. In this thesis, we have studied current. AQM schemes and their approach in congestion management. We improved the existing DRED algorithm and used it in our own AQM algorithm railed Class-based DRED (CDRED). CDRED is able to protect responsive flows from unresponsive ones. Moreover, it has the ability to divide the available bandwidth based on weights that the user supplies.