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Title: Sharing the cost of backbone networks: cui bono?
Authors: Gyarmati, Laszlo 
Stanojevic, Rade 
Sirivianos, Michael 
Keywords: Fairness;Cost allocation;Internet;Real property
Category: Computer and Information Sciences
Field: Engineering and Technology
Issue Date: 2012
Publisher: ACM
Source: IMC '12 Proceedings of the 2012 Internet Measurement Conference, Boston, Massachusetts, USA, November 14- 16, 2012, pp. 509-522
Conference: ACM SIGCOMM Internet Measurement Conference 
Abstract: We study the problem of how to share the cost of a backbone network among its customers. A variety of empirical cost-sharing policies are used in practice by backbone network operators but very little ever reaches the research literature about their properties. Motivated by this, we present a systematic study of such policies focusing on the discrepancies between their cost allocations. We aim at quantifying how the selection of a particular policy biases an operator's understanding of cost generation. We identify F-discrepancies due to the specific function used to map traffic into cost (e.g., volume vs. peak rate vs. 95-percentile) and M-discrepancies, which have to do with where traffic is metered (per device vs. ingress metering). We also identify L-discrepancies relating to the liability of individual customers for triggered upgrades and consequent costs (full vs. proportional), and finally, TCO-discrepancies emanating from the fact that the cost of carrying a bit is not uniform across the network (old vs. new equipment, high vs. low energy or real estate costs, etc.). Using extensive traffic, routing, and cost data from a tier-1 network we show that F-discrepancies are large when looking at individual links but cancel out when considering network-wide cost-sharing. Metering at ingress points is convenient but leads to large M-discrepancies, while TCO-discrepancies are huge. Finally, L-discrepancies are intriguing and esoteric but understanding them is central to determining the cost a customer inflicts on the network
ISBN: 978-1-4503-1705-4
DOI: 10.1145/2398776.2398830
Rights: © ACM 2012
Type: Book Chapter
Appears in Collections:Κεφάλαια βιβλίων/Book chapters

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