Journal of Network and Systems Management

, Volume 24, Issue 3, pp 607–628 | Cite as

Cost Comparison of Alternative Architectures for IP-over-Optical Core Networks

  • Weiyi Zhang
  • Balagangadhar G. BathulaEmail author
  • Rakesh K. Sinha
  • Robert Doverspike
  • Peter Magill
  • Aswatnarayan Raghuram
  • Gagan Choudhury


We explore alternative architectures to reduce cost of IP-over-optical core networks. We conducted a detailed cost study of three architectures. We start with a Baseline architecture that captures present mode of operations with future traffic projections and utilizes technologies such as Ethernet line-cards and OTN sub-wavelength switching. The next architecture, Streamlined, replaces the hub-and-spoke topology of Baseline with a flat topology and is also more judicious in its restoration design. Our detailed study shows significant cost savings for the Streamlined architecture compared to the Baseline. We reduce the cost further in our third proposed architecture: Ethernet enabled IP core consisting of OTN switches (with and without packet switching) and without any backbone routers or MPLS switches. Our results also demonstrate that we can achieve significant reduction in switching costs but reducing cost of transport remains a significant challenge. This paper is an extended version of our previous work published in (11th international conference on the design of reliable communication networks (DRCN), pp 227–234, 2015).


Cost model Network architectures IP DWDM OTN Multilayer 



We acknowledge the support of the DARPA CORONET Program, Contract N00173-08-C-2011. The views, opinions, and/or findings contained in this article are those of the authors and should not be interpreted as representing the official views or policies, either expressed or implied, of DARPA or the Department of Defense. Approved for Public Release, Distribution Unlimited.


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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Weiyi Zhang
    • 1
  • Balagangadhar G. Bathula
    • 1
    Email author
  • Rakesh K. Sinha
    • 1
  • Robert Doverspike
    • 2
  • Peter Magill
    • 3
  • Aswatnarayan Raghuram
    • 4
  • Gagan Choudhury
    • 4
  1. 1.AT&T Labs - ResearchMiddletownUSA
  2. 2.Network Evolution Strategies, LLCMiddletownUSA
  3. 3.Silicon Lightwave Services, LLCNewarkUSA
  4. 4.AT&T LabsMiddletownUSA

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