• A Fault-Tolerant and Consistent SDN Controller 

      Kamisinski, Andrzej; Gonzalez, Andres Javier; Helvik, Bjarne Emil; Nencioni, Gianfranco (Chapter; Conference object; Peer reviewed, 2016)
      Software-Defined Networking (SDN) is a new paradigm that promises to enhance network flexibility and innovation. However, operators need to thoroughly assess its advantages and threats before they can implement it. Robustness ...
    • Assessing the risk of violating SLA dependability requirements in software-defined networks 

      Kamisiński, Andrzej; Helvik, Bjarne Emil; Gonzalez, Andres Javier; Nencioni, Gianfranco (Chapter; Peer reviewed, 2017)
      Dependability of computer and communication networks is an important aspect of the customer-provider relationship in the telecommunication industry. Considering the increasing interest in Software-Defined Networking (SDN) ...
    • Availability Modelling of Software-Defined Backbone Networks 

      Kamisinski, Andrzej; Gonzalez, Andres Javier; Helvik, Bjarne Emil; Nencioni, Gianfranco; Heegaard, Poul Einar (Chapter; Conference object; Peer reviewed, 2016)
      Software-Defined Networking (SDN) promises to improve the programmability and flexibility of networks, but it may also bring new challenges that need to be explored. The main objective of this paper is to present a ...
    • Dependability of the NFV Orchestrator: State of the Art and Research Challenges 

      Gonzalez, Andres Javier; Nencioni, Gianfranco; Kamisinski, Andrzej; Helvik, Bjarne Emil; Heegaard, Poul Einar (Journal article; Peer reviewed, 2018)
      The introduction of network function virtualisation (NFV) represents a significant change in networking technology, which may create new opportunities in terms of cost efficiency, operations, and service provisioning. ...
    • GEARSHIFT: Guaranteeing availability requirements in SLAs using hybrid fault tolerance 

      Gonzalez, Andres Javier; Helvik, Bjarne Emil; Tiwari, Prakriti; Denis, Becker; Wittner, Otto Jonassen (Chapter; Conference object; Peer reviewed, 2015)
      The dependability of ICT systems is vital for today's society. However, operational systems are not fault free. Providers and customers have to define clear availability requirements and penalties on the delivered services ...
    • Impact of SDN Controllers Deployment on Network Availability 

      Nencioni, Gianfranco; Helvik, Bjarne Emil; Gonzalez, Andres Javier; Heegaard, Poul Einar; Kamisinski, Andrzej (Research report, 2016)
      Software-defined networking (SDN) promises to improve the programmability and flexibility of networks, but it may bring also new challenges that need to be explored. The purpose of this technical report is to assess how ...
    • Service availability in the NFV Virtualized Evolved Packet Core 

      Mahmood, Kashif; Gonzalez, Andres Javier; Helvik, Bjarne Emil; Nencioni, Gianfranco; Heegaard, Poul Einar; Grønsund, Pål R. (Conference object; Peer reviewed, 2015)
      Network Function Virtualization (NFV) promises to transform the way telecom providers design and operate networks and network services. Virtualized Evolved Packet Core (vEPC) is one of the NFV use cases that has got most ...
    • The Positive Impact of Failures on Energy Efficient Virtual Machines Consolidation 

      Gonzalez, Andres Javier; Helvik, Bjarne Emil (Conference object, 2014)
      Failures are undesirable events that should be always prevented. This paper agrees with this concept, but it is also aware that failures are unavoidable events. The main objective of this paper is to show how the failure ...