From: Yuhan Cai (yuhancai@cs.washington.edu)
Date: Tue Nov 02 2004 - 22:45:18 PST
Title: Quantifying the Causes of Path Inflation
Authors: Neil Spring, Ratul Mahajan and Thomas Anderson
Reviewed by: Yuhan Cai
Main results of the paper:
， It employs novel techniques to identify the root causes of internet path inflation.
， It analyzes observed and hypothetical topologies and policies to exploit the effects of different factors.
Strengths of the paper:
， It provides the first set of experimental data on the prevalence of late-exit, micro-engineered, and load-balanced policies.
， Inference techniques are developed for intra-domain routing and peering policies to evaluate them in terms of path inflation.
， The effects of the 6 individual causes of path inflation are identified and isolated.
Key limitations:
， The research is trace-driven, and therefore the results are limited in the sense that only a certain set of ISPs and vantage points is available.
， The provisioning and policy choices below the IP layer are not quite visible.
Relevance of the paper:
， As no existing work has completely explained the effects of various factors on path inflation, this paper characterizes the extent to which different issues affect inflation and presents a useful insight into network and protocol design.
Future work:
， The problem of path inflation could be alleviated if better peering point and AS-path selection mechanisms were developed.
， It would be necessary to consider the generalization of the current framework to other vantage points.
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