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Compact Routing on Internet-Like Graphs (2003) [30 citations — 4 self]

by Dmitri Krioukov ,  Kevin Fall ,  Xiaowei Yang
IN PROC. IEEE INFOCOM
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Abstract:

The Thorup-Zwick (TZ) compact routing scheme is the first generic stretch-3 routing scheme delivering a nearly optimal per-node memory upper bound. Using both direct analysis and simulation, we derive the stretch distribution of this routing scheme on Internet-like interdomain topologies. By investigating the TZ scheme on random graphs with power-law node degree distributions, P k k -# , we find that the average TZ stretch is quite low and virtually independent of #. In particular, for the Internet interdomain graph with # 2.1, the average TZ stretch is around 1.1, with up to 70% of all pairwise paths being stretch-1 (shortest possible). As the network grows, the average stretch slowly decreases. The routing table is very small, too. It is well below its upper bounds, and its size is around 50 records for -node networks. Furthermore, we find that both the average shortest path length (i.e. distance) d and width of the distance distribution # observed in the real Internet inter-AS graph have values that are very close to the minimums of the average stretch in the d- and #-directions. This leads us to the discovery of a unique critical point of the average TZ stretch as a function of d and #. The Internet distance distribution is located in a close neighborhood of this point. This is remarkable given the fact that the Internet interdomain topology has evolved without any direct attention paid to properties of the stretch distribution. It suggests the average stretch function may be an indirect indicator of the optimization criteria influencing the Internet's interdomain topology evolution.

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