Performance modeling of DiffServ meter/markers

Abstract

SUMMARYThe paper presents analytical models of the following meter/markers used as building blocks of DiffServ architecture supporting Assured Forwarding: Single Rate Three Color Marker (srTCM), Two Rate Three Color Marker (trTCM), and Time Sliding Window Three Color Marker (TSW3CM). The model of the latter involves finding the distribution of the TSW-averaged traffic rate approximated by the rate estimator. A respective probability density function that, if integrated in appropriate bounds, allows finding packet marking probabilities is proposed. Models for srTCM and trTCM, which use the token bucket mechanism, are based on the classical queuing theory. Namely, models based on the M/M/1/K and D/M/1/K queuing systems are considered. The models enable quick finding of meter/marker characteristics under a particular configuration and traffic volume. It can be also quickly checked how parameter manipulations or changes in the traffic rate affect the characteristics. The models are validated by simulations with two types of traffic: TCP/ftp and web-like traffic.

An optimized aggregate marker algorithm for bandwidth fairness improvement in classifying traffic networks

“…is used instead of a factorial since n and the value of (.) function are not necessarily integer values [35].…”

“…In [35], the authors developed analytical models for singlerate Three Colour Marker (srTCM), two-rate Three Colour Marker (trTCM) and tswTCM for the DiffServ architecture supporting AF. The model distribution of the traffic average rate was approximated through a rate estimator and the marking algorithm determined the behaviour of the traffic marking probability as red, yellow and green.…”

Performance evaluation of selected Transmission Control Protocol variants over a digital video broadcasting‐second generation broadband satellite multimedia system with QoS

“…This architecture allows IP traffic to be classified into a finite number of classes differentiated by priority, to support different QoS levels. The three main components defined in the DiffServ architecture are the following: the traffic classifiers, which select packets and assign (if it is necessary) their Differentiated Services Code Point values; the traffic conditioners [12], which mark and enforce the rate limitation policy; and the per-hop behavior (PHB), which enforces the differentiated packet treatments. In this sense, there are three predefined PHBs: expedited forwarding (EF), AF, and best effort (BE).…”