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ITU Journal on Future and Evolving Technologies, Volume 2 (2021), Issue 1




          to solve controller placement in any SDN‑enabled      [5] Diego    Kreutz,   Fernando    MV    Ramos,
          data‑plane (such as data‑planes that support protocols     Paulo           Esteves           Verissimo,
          such as P4 Runtime, a successor to OpenFlow).  We          Christian        Esteve         Rothenberg,
          believe that our method and analysis would be bene icial   Siamak   Azodolmolky,   and   Steve   Uhlig.
          for operators and service providers, not only during the   “Software‑de ined networking: A comprehensive
          initial design, but also during the incremental design of  survey”. In: Proceedings of the IEEE 103.1 (2015),
          the SDN‑enabled networks.                                  pp. 14–76.
                                                                [6] Slavica Tomovic, Milica Pejanovic‑Djurisic, and
          10.  FUTURE WORK                                           Igor Radusinovic. “SDN based mobile networks:
                                                                     Concepts and bene its”. In: Wireless Personal
          In future we intend to extend our work to address
                                                                     Communications 78.3 (2014), pp. 1629–1644.
          dynamic controller placement which is necessary to
          meet 5G requirements such as ultra‑reliable low latency  [7] Enrique Hernandez‑Valencia, Steven Izzo, and Beth
          communications achievable through dynamic placement        Polonsky. “How will NFV/SDN transform service
          of the mobile edge computing node.  We also plan           provider opex?” In: IEEE Network 29.3 (2015),
          to evaluate the security aspect of SDN controllers.        pp. 60–67.
          This is motivated by the fact that centralizing the   [8] Brandon     Heller,  Rob    Sherwood,   and
          network control intelligence presents a single point of    Nick  McKeown.   “The  controller  placement
          attack/failure.                                            problem”.  In:  ACM    SIGCOMM    Computer
          The assumption that the bandwidth for all connection       Communication Review 42.4 (2012), pp. 473–478.
          links is constant (see Section 4.1) is not valid for the actual  [9] Maryam Tanha, Dawood Sajjadi, and Jianping Pan.
          SANReN network. This assumption was made to simplify       “Enduring  node   failures  through  resilient
          the mathematical model formulation. In future, a more      controller  placement  for  software  de ined
          complicated scenario with different link bandwidths will   networks”. In: Global Communications Conference
          be considered.                                             (GLOBECOM), 2016 IEEE. IEEE. 2016, pp. 1–7.
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          traf ic pro iles combined with a rerun of the evaluation in  07/16/Internet2-Network-Infrastructure-
          Section 7 will be considered. We also intend to use the    Topology-All-legendtitle.pdf.
          proposed approach to optimize data‑planes running P4  [11] Yan‑Nan Hu, Wen‑Dong Wang, Xiang‑Yang Gong,
          Runtime protocol. Last but not least, we intend to develop  Xi‑Rong Que, and Shi‑Duan Cheng. “On the
          a dynamic control traf ic load balancing application based  placement of controllers in software‑de ined
          on current switch resource (RAM, CPU, and storage)         networks”. In: The Journal of China Universities
          utilization.                                               of Posts and Telecommunications 19 (2012),
                                                                     pp. 92–171.
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