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  4. On the Benefits of Joint Optimization of Reconfigurable CDN-ISP Infrastructure
 
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2021
  • Zeitschriftenaufsatz

Titel

On the Benefits of Joint Optimization of Reconfigurable CDN-ISP Infrastructure

Abstract
ISP networks have become a critical infrastructure in our society. Traffic in these networks is growing and is increasingly dominated by a small number of large CDNs connecting at multiple locations. Simultaneously, the networks are becoming more flexible, in terms of routing, CDN user mapping, and also regarding the IP topology: emerging optical technologies allow to flexibly reconfigure the network. This paper studies the potential gains of these reconfiguration flexibilities. The idea is to make CDN-ISP infrastructure demand-aware, that is, to re-optimize it towards the changing end-user demands over time. We present an optimization framework and conduct an extensive evaluation using data from a large European ISP. We find that such a reconfigurable infrastructure has indeed a high potential: by leveraging spatial and diurnal traffic patterns, the efficiency of ISP networks and CDNs is improved significantly. Specifically, the required backbone capacity is reduced by 15% while reducing path lengths by 30%, on average and during the critical peak hour. Moreover, such infrastructures can leverage re-optimizations during specific events, like the COVID-19 pandemic, and under link failures. We optimistically assume a cooperative environment of ISPs and CDNs, and we conclude by discussing trends that foster the identified benefits in practice.
Author(s)
Zerwas, Johannes
Poese, Ingmar
Schmid, Stefan
Blenk, Andreas
Zeitschrift
IEEE transactions on network and service management
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DOI
10.1109/TNSM.2021.3119134
Language
Englisch
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