Departmental Papers (ESE)


Paths with loops, even transient ones, pose significant stability problems in networks. As a result, much effort has been devoted over the past thirty years to designing distributed algorithms capable of avoiding loops. We present a new algorithm, Distributed path computation with Intermediate Variables (DIV), that guarantees that no loops, transient or steady-state, can ever form. DIV’s novelty is in that it is not restricted to shortest paths, can easily handle arbitrary sequences of changes and updates, and provably outperforms earlier approaches in several key metrics. In addition, when used with distance-vector style path computation algorithms, DIV also prevents counting-to-infinity; hence further improving convergence. The paper introduces DIV and its key properties. Simulation quantifying its performance gains are also presented.

Document Type

Conference Paper

Date of this Version

June 2007


Postprint version. Published in Lecture Notes in Computer Science, Managing Traffic Performance in Converged Networks, Proceedings of the 20th International Teletraffic Congress, ITC20 2007, Volume 4625, June 2007, pages 104-116.
Publisher URL:


routing, loop, distributed



Date Posted: 06 March 2007

This document has been peer reviewed.