Conference and workshop papers

Title of the paper	Quantifying ASes Multiconnectivity using Multicast Information
Author(s)	Pascal Merindol, Virginie Van den Schrieck, Benoit Donnet, Olivier Bonaventure, Jean-Jacques Pansiot
Location	Chicago, USA
Date	4 - 6. November 2009
Link to Eventpage	Internet Measurement Conference 2009
Abstract	Redundant connectivity (ormulticonnectivity) between autonomous systems (ASes) is important for interdomain traffic engineering and fast recovery in case of failures. However, the redundancy of ASes peering links has not been quantitatively studied, mainly due to the difficulty of obtaining relevant data. In this paper, we show that the mrinfo multicast monitoring tool can provide useful data about the Internet topology and such links in particular. Our analysis relies on more than four years of daily queries to about ten thousand routers divided in more than two hundred ASes. We demonstrate that peering links between ASes are frequently redundant. In particular, our analysis shows that more than half of the studied ASes pairs are connected through multiple physical links. We then refine our analysis by considering the different types of ASes (Tier-1, Transit, Stub) and their business relationship (peer-to-peer, customer-to-provider, provider-to- customer). A particular result of our analysis is that roughly 75% of the peer-to-peer relationships between adjacent Tier-1 ASes are redundant.

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