att_abstract={{The largest IXPs carry on a daily basis traffic volumes in the petabyte range, similar to what some of the largest global ISPs reportedly handle. This little-known fact is due to a
few hundreds of member ASes exchanging traffic with one another over the IXP�s infrastructure. This paper reports on a first-of-its-kind and in-depth analysis of one of the largest IXPs worldwide based on nine month worth of sFlow records collected at that IXP in 2011.

A main finding of our study is that the number of actual peering links at this single IXP exceeds the total number of AS links of the peer-peer type in the entire Internet known
as of 2010! To explain such a surprisingly rich peering fabric, we examine in detail this IXP�s ecosystem and highlight the diversity of networks that are members at this IXP and connect there with other member ASes for reasons that are similarly diverse, but can be partially inferred from their business types and observed traffic patterns. In the process, we investigate this IXP�s traffic matrix and illustrate what its temporal and structural properties can tell us about the member ASes that generated the traffic in the first place. While our results suggest that these large IXPs can be viewed as a
microcosm of the Internet ecosystem itself, they also argue for a re-assessment of the mental picture that our community has about this ecosystem.}},
	att_copyright_notice={{(c) ACM, 2012. This is the author's version of the work. It is posted here by permission of ACM for your personal use. Not for redistribution. The definitive version was published in 2012 {{, Volume 42}}{{, Issue 4}}{{, 2012-08-01}}{{, http://conferences.sigcomm.org/sigcomm/2012/}}.
	att_tags={Internet Exchange Point (IXP), Measurement, Public peering, IXP traffic matrix, AS-level ecosystem},
	author={Walter Willinger and Bernhard Ager, ETH Zurich and Nikolaos Chatzis, TU Berlin/T-Labs and Anja Feldmann, TU Berlin/T-Labs and Nadi Sarrar, TU Berlin/T-Labs and Steve Uhlig, QMUL},
	institution={{Computer Communication Review (Proc. of the 2012 ACM Sigcomm Conference)}},
	title={{Anatomy of a Large European IXP}},