Ara es mostren els items 1-20 de 35

  • 1.3 µm SDN-enabled optical packet switch architecture for high performance and programmable data center network 

    Miao, Wang; Agraz Bujan, Fernando; De Waardt, Huug D.; Spadaro, Salvatore; Sebastian Dorren, Harm Joseph; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    We demonstrate a 1.3 µm port-count scalable SDN-enabled optical packet switch architecture for programmable data-center networks. Experimental assessments of a 40Gb/s 4×4 switch system with SDN-control show <10-5 packet-loss ...
  • Advanced routing mechanisms in ASON/GMPLS networks 

    Agraz Bujan, Fernando (Universitat Politècnica de Catalunya, 2012-10-01)
    Tesi
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    Current network infrastructures are supported on a layered model whereby heterogeneous data traffic can be seamlessly transported. In this architecture, where client/server relationships are established between adjacent ...
  • A fully SDN enabled all-optical architecture for data centre virtualisation with time and space multiplexing 

    Kondepu, K; Jackson, Chirs; Ou, Y; Pagès Cruz, Albert; Agraz Bujan, Fernando; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018-07-01)
    Article
    Accés obert
    Virtual Data Centre (VDC) solutions provide an environment that is able to quickly scale-up and where virtual machines and network resources can be quickly added on-demand through self-service procedures. VDC providers ...
  • Analysis of traffic engineering information dissemination strategies in PCE-based multi-domain optical networks 

    Spadaro, Salvatore; Perelló Muntan, Jordi; Hernández Sola, Guillem; Moreno, A.; Agraz Bujan, Fernando; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Computer Society Publications, 2010)
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    This paper presents and compares different TE information dissemination strategies between Path Computation Elements (PCEs) in multi-domain optical networks. In such network context, recent studies have found that ...
  • An experimental GMPLS-controlled network test-bed enabling sub-wavelength connection provisioning 

    Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Ruiz Ramírez, Marc; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06-28)
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    The efficient accommodation of sub-wavelength client flows on optical channels is a current challenge for resources use optimization in GMPLS controlled optical networks. While optical channels capacity usually exceeds 10 ...
  • A novel SDN enabled hybrid optical packet/circuit switched data centre network: the LIGHTNESS approach 

    Peng, Shuping; Simeonidou, Dimitra; Zervas, George; Spadaro, Salvatore; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Careglio, Davide; Becerra Fontal, Yolanda; Farreras Esclusa, Montserrat (2014)
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    Current over-provisioned and multi-tier data centre networks (DCN) deploy rigid control and management platforms, which are not able to accommodate the ever-growing workload driven by the increasing demand of ...
  • Demonstration of GMPLS-controlled device power management for next generation green optical networks 

    Morea, Annalisa; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore (2012)
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    We propose GMPLS protocol enhancements enabling dynamic power state management of optoelectronic network devices for setup-time-aware differentiated connection provisioning. Daily energy savings of 56% are demonstrated in ...
  • Demonstration of reconfigurable virtual data center networks enabled by OPS with QoS guarantees 

    Miao, Wang; Peng, Shuping; Spadaro, Salvatore; Bernini, Giacomo; Agraz Bujan, Fernando; Ferrer Ferré, Àlex; Perelló Muntan, Jordi; Zervas, Georgios; Nejabati, Reza; Ciulli, Nicola; Simeonidou, Dimitra; Dorren, Harm; Calabretta, Nicola (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    We demonstrate a reconfigurable virtual datacenter network by utilizing statistical multiplexing offered by scalable and flow-controlled optical switching system. Results show QoS guarantees by the priority assignment and ...
  • Demonstration of the benefits of SDN technology for all-optical data centre virtualisation 

    Jackson, Chris; Nejabati, Reza; Agraz Bujan, Fernando; Pagès Cruz, Albert; Galili, Michael; Spadaro, Salvatore; Simeonidou, Dimitra (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    An integrated software stack made up of extended OpenStack, OpenDaylight and custom OpenFlow agents enabling Virtual Data Centre deployment on an all-optical architecture employing hollow-core fibre, TDM fast switches and ...
  • Design and implementation of a GMPLS-controlled grooming-capable optical transport network 

    Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Perelló Muntan, Jordi; Ruiz Ramírez, Marc; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-07)
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    Aiming at better resource utilization, an important requirement of future optical transport networks is the capability to accommodate subwavelength client flows efficiently. This can be put into action thanks to the ...
  • Development and experimentation towards a multicast-enabled Internet 

    Careglio, Davide; Papadimitriou, Dimitri; Agraz Bujan, Fernando; Sahhaf, S; Perelló Muntan, Jordi; Tavernier, W; Spadaro, Salvatore; Colle, Didier (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    In this paper, we report our development experience and experimentation studies of two multicast routing schemes for the Internet, namely, PIM-SSM and GCMR. We detail their implementation over the Quagga open ...
  • Dynamic impairment-aware optical networking: some experimental results of the EU DICONET project 

    Spadaro, Salvatore; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Angelou, Marianna; Azodolmolky, Siamak; Qin, Yixuan; Nejabati, Reza; Simeonidou, Dimitra; Tomkos, Ioannis (2011)
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    The paper presents some results from the experimental validation of the achievements of the EU DICONET project. Specifically, the DICONET test-bed is presented and the experiments conducted for the performance evaluation ...
  • Dynamic topology discovery in SDN-enabled transparent optical networks 

    Montero, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    Optical technologies play nowadays a crucial role in different network scenarios (e.g., data centres, metro and access networks), mainly due to their support for higher bandwidth and scalability in comparison to electronic-based ...
  • Enhanced domain disjoint backward recursive TE path computation for PCE-based multi-domain networks 

    Hernández Sola, Guillem; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Junyent Giralt, Gabriel (2011-04)
    Article
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    The ability of computing optimal routes poses new challenges when extending it to larger multi-domain network scenarios, as the quality of these computed endto-end inter-domain routes depends on the selection of the domain ...
  • Experimental assessment of an SDN-based control of OPS switching nodes for intra-data center interconnect 

    Agraz Bujan, Fernando; Miao, Wang; Ferrer Delgado, Alejandro; Bernini, Giacomo; Dorren, Harm; Calabretta, Nicola; Ciulli, Nicola; Perelló Muntan, Jordi; Peng, Shuping; Zervas, Georgios; Simeonidou, Dimitra; Junyent Giralt, Gabriel; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    An SDN-based control framework for OPS switches is experimentally assessed. The OpenFlow messages enabling control communication between SDN controller and OPS switch are validated. Dynamic OPS virtual network slices for ...
  • Experimental assessment of VDC provisioning in SDN/OpenStack-based DC infrastructures with optical DCN 

    Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero Herrera, Rafael; landi, Giada; Monno, Roberto; Aznar, Jose; Viñes, Albert; Jackson, Chris; Simeonidou, Dimitra; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    VDC provisioning requires the coordinated configuration of several types of resources. We present a DC architecture for the orchestration and provisioning of VDC instances on top of DCs with optical DCN and experimentally ...
  • Experimental comparison of impairment-aware RWA algorithms in a GMPLS-controlled dynamic optical network 

    Angelou, Marianna; Agraz Bujan, Fernando; Kokkinos, Panagiotis; Perelló Muntan, Jordi; Azodolmolky, Siamak; Varvarigos, Emmanouel; Spadaro, Salvatore; Tomkos, Ioannis (2011)
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    The European research project DICONET proposed and implemented a multi-plane impairment-aware solution for flexible, robust and cost-effective core optical networks. The vision of DICONET was realized via a set of cross-layer ...
  • Experimental demonstration of centralized and distributed impairment-aware control plane schemes for dynamic transparent optical networks 

    Tomkos, Ioannis; Gunkel, Mathias; Varvarigos, Manos; Kokkinos, Panagiotis; Pointurier, Yvan; Agraz Bujan, Fernando; Azodolmolky, Siamak; Angelou, Marianna; Perelló Muntan, Jordi; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Francescon, Antonio; Saradhi, Chava (IEEE Computer Society Publications, 2010)
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    In transparent optical networks, the signal experiences the impact of various phenomena that degrade its quality. Considering the impact of physical layer impairments (PLIs) on transparent [1] and highly dynamic optical ...
  • Experimental evaluation of path restoration for a centralised impairment-aware GMPLS-controlled all-optical network 

    Tomkos, Ioannis; Agraz Bujan, Fernando; Perelló Muntan, Jordi; Angelou, Marianna; Azodolmolky, Siamak; Velasco Esteban, Luis Domingo; Spadaro, Salvatore; Kokkinos, Panagiotis; Varvarigos, Emmanouel (IEEE Computer Society Publications, 2010)
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    This paper evaluates a centralised impairment-aware path restoration approach for GMPLScontrolled transparent optical networks. Experimental results on a 14-node network test-bed show successful QoT compliant path restoration ...
  • Experimental validation of end-to-end GMPLS-enabled restoration in multi-domain transparent WSON 

    Martínez, Ricardo; Casellas, Ramon; Velasco Esteban, Luis Domingo; Agraz Bujan, Fernando; Muñoz, Raul; Spadaro, Salvatore (IEEE Computer Society Publications, 2010)
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    Two GMPLS restoration strategies operating at wavelength and link granularities are experimentally validated in a multi-domain WSON. The strategies are qualitatively compared in terms of resource usage, restorability and ...