Now showing items 1-20 of 44

    • 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)
      Conference report
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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 ...
    • 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
      Open Access
      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 ...
    • 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)
      Conference report
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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 ...
    • Actuation framework for 5G-enabled network slices with QoE/QoS guarantees 

      Montero, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (2019)
      Conference report
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      Network slicing is identified as the enabling technology for efficient service delivery in future 5G networks. Moreover, a key aspect in 5G network slicing relates to the delivery and maintenance of QoS/QoE guarantees for ...
    • Advanced routing mechanisms in ASON/GMPLS networks 

      Agraz Bujan, Fernando (Universitat Politècnica de Catalunya, 2012-10-01)
      Doctoral thesis
      Open Access
      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 ...
    • 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)
      Conference report
      Open Access
      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 ...
    • 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)
      Conference report
      Open Access
      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 ...
    • Demonstration of GMPLS-controlled device power management for next generation green optical networks 

      Morea, Annalisa; Perelló Muntan, Jordi; Agraz Bujan, Fernando; Spadaro, Salvatore (2012)
      Conference report
      Open Access
      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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
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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)
      Article
      Open Access
      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)
      Conference report
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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)
      Conference report
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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 service reallocation in NFV-based transport WDM optical networks 

      Pagès Cruz, Albert; Agraz Bujan, Fernando; Montero, Rafael; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      Future network services are expected to deliver additional functionalities besides connectivity. The Network Function Virtualization (NFV) paradigm provides the foundation for such concept. We propose a reallocation-based ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Enabling multi-segment 5G service provisioning and maintenance through network slicing 

      Montero Herrera, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (2020-01-03)
      Article
      Restricted access - publisher's policy
      The current deployment of 5G networks in a way to support the highly demanding service types defined for 5G, has brought the need for using new techniques to accommodate legacy networks to such requirements. Network Slicing ...
    • End-to-end 5G service deployment and orchestration in optical networks with QoE guarantees 

      Montero Herrera, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Spadaro, Salvatore (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference report
      Open Access
      The upcoming 5G deployments will impose stringent requirements. Optical networks control and resource orchestration is set to potentially turn into software-defined approaches in order to address such requirements. As a ...
    • 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
      Restricted access - publisher's policy
      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)
      Conference report
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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 SDN-enabled reconfigurable OPSquare data center networks with QoS guarantees 

      Xue, Xuwei; Wang, Fulong; Agraz Bujan, Fernando; Pagès Cruz, Albert; Pan, B; Yan, F; Spadaro, Salvatore; Calabretta, Nicola (Optical Society of American (OSA), 2019)
      Conference report
      Restricted access - publisher's policy
      An SDN-controlled DCN enabling QoS-driven network-slice reconfiguration and packet priority updating is experimentally assessed. Network-slice can be reconfigured within 150 ms to decrease packet loss. The measured ToR-to-ToR ...