@phdthesis{Lange2019,
  author    = {Lange, Stanislav},
  title     = {Optimization of Controller Placement and Information Flow in Softwarized Networks},
  issn      = {1432-8801},
  doi       = {10.25972/OPUS-17457},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-174570},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2019},
  abstract  = {The Software Defined Networking (SDN) paradigm offers network operators numerous improvements in terms of flexibility, scalability, as well as cost efficiency and vendor independence. However, in order to maximize the benefit from these features, several new challenges in areas such as management and orchestration need to be addressed. This dissertation makes contributions towards three key topics from these areas. Firstly, we design, implement, and evaluate two multi-objective heuristics for the SDN controller placement problem. Secondly, we develop and apply mechanisms for automated decision making based on the Pareto frontiers that are returned by the multi-objective optimizers. Finally, we investigate and quantify the performance benefits for the SDN control plane that can be achieved by integrating information from external entities such as Network Management Systems (NMSs) into the control loop. Our evaluation results demonstrate the impact of optimizing various parameters of softwarized networks at different levels and are used to derive guidelines for an efficient operation.},
  subject      = {Leistungsbewertung},
  language  = {en}
}
@phdthesis{Metter2019,
  author    = {Metter, Christopher Valentin},
  title     = {Resilience, Availabilty, and Serviceability Evaluation in Software-defined Networks},
  issn      = {1432-8801},
  doi       = {10.25972/OPUS-17678},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-176788},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2019},
  abstract  = {With the introduction of Software-defined Networking (SDN) in the late 2000s, not only a new research field has been created, but a paradigm shift was initiated in the broad field of networking. The programmable network control by SDN is a big step, but also a stumbling block for many of the established network operators and vendors. As with any new technology the question about the maturity and the productionreadiness of it arises. Therefore, this thesis picks specific features of SDN and analyzes its performance, reliability, and availability in scenarios that can be expected in production deployments. The first SDN topic is the performance impact of application traffic in the data plane on the control plane. Second, reliability and availability concerns of SDN deployments are exemplary analyzed by evaluating the detection performance of a common SDN controller. Thirdly, the performance of P4, a technology that enhances SDN, or better its impact of certain control operations on the processing performance is evaluated.},
  subject      = {Leistungsbewertung},
  language  = {en}
}