"High-Availability Network Design, Optimization, and Analysis"

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Despite considerable efforts taken to provide physical protection of cables, North American networks still experience frequent cable cuts and outages. For more traditional networks of the type used for basic voice or data, outages can result in severe financial losses. Given the critical nature of many of the applications that emerging networks are intended to carry (medical-grade applications, first responder applications, etc.), the consequences of failure could be much more extreme. And yet the very sparse nature of many public (and even some private) networks' underlying infrastructure makes them inherently un-survivable, often with single points of failure. In those cases, span cuts could easily result in one portion of the network being severed from the remainder. The proposed work will investigate the design and performance analysis of networks in mission critical settings. This requires modeling and analysis of the current use, as well as the projected future use, of such networks, taking into consideration how the usage patterns of those networks will shift over time. While work has been done to provide enhanced survivability of critical applications, there are many opportunities to develop more advanced techniques to further enhance survivability and intrinsic availability. The growing prevalence of critical applications routed over modern networks will significantly alter the way in which they will need to evolve when compared to traditional "best effort" IP-based networks. The research will focus on four key topics: (1) Traffic Characterization of Critical Applications and Associated Availability Analysis (2) Improved Availability Through Enhanced Multi-Failure Protection (3) Improved Availability through Network Topology Augmentation (4) Heuristic and Advanced ILP Optimization Techniques