Rethinking IP core networks

The Internet core today is completely based on IP routers. Circuits are only used to provide static point-to-point optical links between routers. As others have recognized, current practice makes it hard to take advantage of very high-speed, low-power optical circuit switches in the core. Despite many proposals to mix packet switching with dynamic circuit switching, none have taken hold. In these times of rapidly increasing traffic, and rapidly decreasing profits for ISPs, it is time to rethink how backbones are built. In this paper, we propose to replace the largest backbone routers with much cheaper hybrid packet-optical switches in a fully meshed IP core. We take advantage of new control planes for software-defined networks to control the packet and circuit networks from a single vantage point. To demonstrate the enormous potential cost savings, we present a detailed analysis of the capital expenditure and show how our approach offers 60% cost savings for typical backbone operators.

[1]  J. M. Simmons,et al.  Optical Network Design and Planning , 2008 .

[2]  Robert D. Doverspike,et al.  Efficient distributed path selection for shared restoration connections , 2002, Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies.

[3]  Nick McKeown,et al.  Why OpenFlow/SDN can succeed where GMPLS failed , 2012, 2012 38th European Conference and Exhibition on Optical Communications.

[4]  Kavé Salamatian,et al.  Traffic matrix estimation: existing techniques and new directions , 2002, SIGCOMM '02.

[5]  Matthias Gunkel,et al.  Cost modeling and evaluation of capital expenditures in optical multilayer networks , 2008 .

[6]  Jennifer Yates,et al.  IP over optical cross-connect architectures [Topics in Optical Communications] , 2007, IEEE Communications Magazine.

[7]  Adrian Farrel,et al.  GMPLS: the promise of the next-generation optical control plane , 2005, IEEE Communications Magazine.

[8]  Ratul Mahajan,et al.  Measuring ISP topologies with Rocketfuel , 2004, IEEE/ACM Transactions on Networking.

[9]  Robert D. Doverspike,et al.  Efficient distributed restoration path selection for shared mesh restoration , 2003, TNET.

[10]  Martín Casado,et al.  Onix: A Distributed Control Platform for Large-scale Production Networks , 2010, OSDI.

[11]  Eric Osborne,et al.  Traffic Engineering with MPLS , 2002 .

[12]  Preeti Singh,et al.  Application-aware aggregation and traffic engineering in a converged packet-circuit network , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[13]  Robert Doverspike,et al.  Traffic types and growth in backbone networks , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.

[14]  Martín Casado,et al.  NOX: towards an operating system for networks , 2008, CCRV.

[15]  Vijay P. Kumar,et al.  Switched optical backbone for cost-effective scalable core IP networks , 2003, IEEE Commun. Mag..