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  • 1. Giorgetti, A.
    et al.
    Sgambelluri, Andrea
    KTH, School of Information and Communication Technology (ICT).
    Paolucci, F.
    Cugini, F.
    Castoldi, P.
    Segment routing for effective recovery and multi-domain traffic engineering2017In: Journal of Optical Communications and Networking, ISSN 1943-0620, E-ISSN 1943-0639, Vol. 9, no 2, p. A223-A232, article id 7858127Article in journal (Refereed)
    Abstract [en]

    Segment routing is an emerging traffic engineering technique relying on Multi-protocol Label-Switched (MPLS) label stacking to steer traffic using the source-routing paradigm. Traffic flows are enforced through a given path by applying a specifically designed stack of labels (i.e., the segment list). Each packet is then forwarded along the shortest path toward the network element represented by the top label. Unlike traditional MPLS networks, segment routing maintains a per-flow state only at the ingress node; no signaling protocol is required to establish new flows or change the routing of active flows. Thus, control plane scalability is greatly improved. Several segment routing use cases have recently been proposed. As an example, it can be effectively used to dynamically steer traffic flows on paths characterized by low latency values. However, this may suffer from some potential issues. Indeed, deployed MPLS equipment typically supports a limited number of stacked labels. Therefore, it is important to define the proper procedures to minimize the required segment list depth. This work is focused on two relevant segment routing use cases: dynamic traffic recovery and traffic engineering in multi-domain networks. Indeed, in both use cases, the utilization of segment routing can significantly simplify the network operation with respect to traditional Internet Protocol (IP)/MPLS procedures. Thus, two original procedures based on segment routing are proposed for the aforementioned use cases. Both procedures are evaluated including a simulative analysis of the segment list depth. Moreover, an experimental demonstration is performed in a multi-layer test bed exploiting a software-defined-networking-based implementation of segment routing.

  • 2. Paolucci, F.
    et al.
    Uceda, V.
    Sgambelluri, Andrea
    KTH, School of Information and Communication Technology (ICT).
    Cugini, F.
    De Dios, O. G.
    Lopez, V.
    Contreras, L. M.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Iovanna, P.
    Ubaldi, F.
    Pepe, T.
    Castoldi, P.
    Interoperable multi-domain delay-aware provisioning using Segment Routing monitoring and BGP-LS advertisement2016In: ECOC 2016 42th European Conference on Optical Communication Proceedings, September 18 - 22, 2016, Düsseldorf, Germany, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 190-192Conference paper (Refereed)
    Abstract [en]

    This paper demonstrates a multi-domain SDN orchestrator using delay information to provision network services using BGP-LS and a novel monitoring system enabled by Segment Routing. Moreover, it is the first implementation and interoperability of the BGP-LS extensions for TE metrics.

  • 3.
    Sgambelluri, Andrea
    et al.
    KTH.
    Milani, A.
    Czentye, J.
    Melian, J.
    Poe, W. Y.
    Tusa, F.
    De Dios, O. G.
    Sonkoly, B.
    Gharbaoui, M.
    Paolucci, F.
    Maini, E.
    Giuliani, G.
    Ramos, A.
    Monti, P.
    Contreras-Murillo, L. M.
    Vaishnavi, I.
    Bernardos Cano, C. J.
    Szabo, R.
    A multi-operator network service orchestration prototype: The 5G exchange2017In: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2017Conference paper (Refereed)
    Abstract [en]

    In the context of the 5GEx Project, a Multi-domain Orchestrator is in charge of creating, deploying, and terminating Network Services spanning across multiple-operators. This live demo showcases the main functionalities of the 5GEx system.

  • 4.
    Sgambelluri, Andrea
    et al.
    KTH.
    Milani, A.
    Czentye, J.
    Melian, J.
    Poe, W. Y.
    Tusa, F.
    de Dios, O. G.
    Sonkoly, B.
    Gharbaoui, M.
    Paolucci, F.
    Maini, E.
    Giuliani, G.
    Ramos, A.
    Monti, Paolo
    KTH, School of Information and Communication Technology (ICT), Communication Systems, CoS, Optical Network Laboratory (ON Lab).
    Contreras-Murillo, L. M.
    Vaishnavi, I.
    Bernardos Cano, C. J.
    Szabo, R.
    A Multi-Operator Network Service Orchestration Prototype: The 5G Exchange2017In: 2017 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC), IEEE , 2017Conference paper (Refereed)
    Abstract [en]

    In the context of the 5GEx Project, a Multi-domain Orchestrator is in charge of creating, deploying, and terminating Network Services spanning across multiple-operators. This live demo showcases the main functionalities of the 5GEx system.

  • 5. Valcarenghi, L.
    et al.
    Kondepu, K.
    Sgambelluri, Andrea
    KTH, School of Information and Communication Technology (ICT).
    Cugini, F.
    Castoldi, P.
    Aparicio Morenilla, R.
    Larrabeiti, D.
    Vermeulen, B.
    SDN-controlled energy-efficient mobile fronthaul: An experimental evaluation in federated testbeds2016In: EUCNC 2016 - European Conference on Networks and Communications, Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 298-301Conference paper (Refereed)
    Abstract [en]

    When evolved NodeB (eNB) flexible functional split is implemented in Cloud-Radio Access Network (Cloud-RAN) 5G systems, fronthaul connectivity between the virtualized functions must be always guaranteed. This study proposes the utilization of Software Defined Networking (SDN) to control mobile fronthaul. In particular, this study investigates the ability of the SDN-based control of reconfiguring the fronthaul to maintain virtualized network function connectivity when cell and optical access turn into sleep mode (off mode) for energy efficiency purposes. The experiments in two federated testbeds show that, upon cell and optical access turning on and off, the fronthaul reconfiguration time is limited to few tens of milliseconds.

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