Internet routing paths stability model and relation to forwarding paths

By

Dimitri Papadimitriou, Davide Careglio, Fabien Tarissan and Piet
Demeester

Proceedings of the the 9th International Conference on
Design of Reliable Communication Networks (DRCN), Budapest,
Hungary, 2013

Abstract

Analysis of real datasets to characterize the local
stability properties of the Internet routing paths suggests that
extending the route selection criteria to account for such
property would not increase the routing path length.
Nevertheless, even if selecting a more stable routing path could
be considered as valuable from a routing perspective, it does not
necessarily imply that the associated forwarding path would be
more stable. Hence, if the dynamics of the Internet routing and
forwarding system show different properties, then one can not
straightforwardly derive the one from the other. If this
assumption is verified, then the relationship between the stability
of the forwarding path (followed by the traffic) and the
corresponding routing path as selected by the path-vector routing
algorithm requires further characterization. For this purpose, we
locally relate, i.e., at the router level, the stability properties of
routing path with the corresponding forwarding path. The
proposed stability model and measurement results verify this
assumption and show that, although the main cause of instability
results from the forwarding plane, a second order effect relates
forwarding and routing path instability events. This observation
provides the first indication that differential stability can safely
be taken into account as part of the route selection process.

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