A modified fair aggregate marking algorithm in DiffServ

With the emergence of network real time application, the need for quality of service (QoS) in the Internet has been given a rise. IETF has proposed a service model - DiffServ, which for its extensibility, has been widely accepted as a promising model. However, researchers found unfairness in DiffServ network. To solve this problem, this paper analyzed the inherent shortcomings of marker based on token bucket (TB) and time sliding window (TSW) in DiffServ, and proposed a new traffic rate estimator algorithm. This algorithm can tolerate the short-term burst of IP flows as well as reflecting the flows´ temporal-behavior. Afterwards, a modified fair aggregate marking (MFAM) algorithm was presented based on the traffic rate estimator algorithm mentioned above. It contributes to fair sharing of excess bandwidth among aggregates. The author validated MFAM algorithm through simulation experimentation, and compared its performance with some other marking algorithms. The results show that MFAM algorithm has better fairness than others.