NDLI: Expected convergence properties of BGP

Content Provider	IEEE Xplore Digital Library
Author	Viswanathan, R. Sabnani, K.K. Holt, R.J. Netravali, A.N.
Copyright Year	2005
Description	Author affiliation: Lucent Technol. Bell Labs., Holmdel, NJ (Viswanathan, R.; Sabnani, K.K.)
Abstract	Border gateway protocol (BGP) is the de facto standard used for interdomain routing. Since packet forwarding may not be possible until stable routes are learned, it is not only critical for BGP to converge but it is important that the convergence be rapid. The distributed and asynchronous nature of BGP in conjunction with local policies makes it difficult to analyze with respect to convergence behavior. We present a novel model which, to our knowledge, is the first one to permit analysis of convergence in the aggregate (i.e., over all message exchange orders between routers regarding route advertisements), rather than worst case behavior. We introduce the notion of probabilistic safety as requiring the probability of convergence to be 1. We provide a necessary and sufficient condition characterizing probabilistic safety that shows that probabilistic safety accommodates BGP configurations whose potential divergence stems solely from pathological message sequences. More generally, we show how to compute for any BGP configuration its probability of convergence. For probabilistically safe configurations, we present procedures for computing their expected time to converge as well as the probability distribution on their convergence times. The ability to compute these quantitative characteristics makes our work "constructive" and provides the basis for further understanding and deriving procedures for optimizing network characteristics. Finally, we simulate several network examples and verify the consistency between our analysis and the simulations
Starting Page	13
Ending Page	15
File Size	395481
Page Count	3
File Format	PDF
ISBN	0769524370
DOI	10.1109/ICNP.2005.16
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-11-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Convergence Safety Computational modeling Analytical models Routing protocols Aggregates Sufficient conditions Pathology Distributed computing Probability distribution
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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