Dynamic Alternative Routing - Modelling and Behaviour - Home
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Dynamic Alternative Routing - Modelling and Behaviour - Home
DAR, dynamic alternative routing, is a simple but effective form of dynamic routing ... lBritish Telecom, Performance Engineering Division, Room 51 MLB5, British Telecom .... results show for the international access example of the next Section.
ITC 12
Torino, June 1988
Dynamic Alternative Routing - Modelling and Behaviour R.J. Gibbens * t
F.P. Kelly t
P.B. Key
*
Abstract DAR, dynamic alternative routing, is a simple but effective form of dynamic routing which is decentralised and which uses only a small amount of local information. This paper examines the modelling and behaviourial aspects of such a scheme. In particular various bounds are presented which hold for any kind of dynamic routing scheme, and can be used to assess the performance of DAR. DAR can be investigated by a simple analytical model, of familar fixed-point form, and simulation studies have verified its accuracy. A simple form of dimensioning is mentioned, and methods of setting trunk reservation parameters are discussed. These are necessary both to improve performance and prevent instability. Lastly, simple ways of extending DAR are examined.
1
Introduction
DAR is a simple but effective dynamic routing strategy, which is decentralised and only uses local information. In particular, the only information required is whether trunk reservation thresholds have been exceede
