| 1. |
- Giorgetti, A., et al.
(författare)
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Segment routing for effective recovery and multi-domain traffic engineering
- 2017
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Ingår i: Journal of Optical Communications and Networking. - : Institute of Electrical and Electronics Engineers (IEEE). - 1943-0620 .- 1943-0639. ; 9:2, s. A223-A232
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Guerzoni, R., et al.
(författare)
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Analysis of end-to-end multi-domain management and orchestration frameworks for software defined infrastructures : An architectural survey
- 2017
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Ingår i: Transactions on Emerging Telecommunications Technologies. - : Wiley-Blackwell. - 2161-5748 .- 2161-3915. ; 28:4
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Tidskriftsartikel (refereegranskat)abstract
- Over the last couple of years, industry operators' associations issued requirements towards an end-to-end management and orchestration plane for 5G networks. Consequently, standard organisations started their activities in this domain. This article provides an analysis and an architectural survey of these initiatives and of the main requirements, proposes descriptions for the key concepts of domain, resource and service slicing, end-to-end orchestration and a reference architecture for the end-to-end orchestration plane. Then, a set of currently available or under development domain orchestration frameworks are mapped to this reference architecture. These frameworks, meant to provide coordination and automated management of cloud and networking resources, network functions and services, fulfil multi-domain (i.e. multi-technology and multi-operator) orchestration requirements, thus enabling the realisation of an end-to-end orchestration plane. Finally, based on the analysis of existing single-domain and multi-domain orchestration components and requirements, this paper presents a functional architecture for the end-to-end management and orchestration plane, paving the way to its full realisation.
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| 3. |
- Paolucci, F., et al.
(författare)
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Interoperable multi-domain delay-aware provisioning using Segment Routing monitoring and BGP-LS advertisement
- 2016
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Ingår i: ECOC 2016 42th European Conference on Optical Communication Proceedings, September 18 - 22, 2016, Düsseldorf, Germany. - : Institute of Electrical and Electronics Engineers (IEEE). - 9783800742745 ; , s. 190-192
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Konferensbidrag (refereegranskat)abstract
- 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.
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| 4. |
- Sgambelluri, Andrea, et al.
(författare)
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A multi-operator network service orchestration prototype : The 5G exchange
- 2017
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Ingår i: 2017 Optical Fiber Communications Conference and Exhibition, OFC 2017 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc.. - 9781943580231
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Konferensbidrag (refereegranskat)abstract
- 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.
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| 5. |
- Sgambelluri, Andrea, et al.
(författare)
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Evaluating Link Latency in Distributed SDN-Based Control Plane Architectures
- 2019
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Ingår i: ICC 2019 - 2019 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC). - : IEEE. - 9781538680889
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Konferensbidrag (refereegranskat)abstract
- Being able to account for the value of latency introduced by the transport infrastructure is considered a crucial feature for any 5G service provisioning strategy. This paper proposes a methodology for the automatic monitoring of the link latency in networks with a distributed SDN-based control plane architecture. The proposed link monitoring solution does not introduce any overhead in the OpenFlow channel and in the data plane. Experimental tests demonstrate the accuracy of the proposed methodology and its ability to scale to large network instances.
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| 6. |
- Song, Haokun, et al.
(författare)
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Cluster-Based Method for Eavesdropping Identification and Localization in Optical Links
- 2023
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Ingår i: Asia Communications and Photonics Conference, ACP. - 2162-108X.
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Konferensbidrag (refereegranskat)abstract
- We propose a cluster-based method to detect and locate eavesdropping events in optical line systems characterized by small power losses. Our findings indicate that detecting such subtle losses from eavesdropping can be accomplished solely through optical performance monitoring (OPM) data collected at the receiver. On the other hand, the localization of such events can be effectively achieved by leveraging in-line OPM data.
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| 7. |
- Valcarenghi, L., et al.
(författare)
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SDN-controlled energy-efficient mobile fronthaul : An experimental evaluation in federated testbeds
- 2016
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Ingår i: EUCNC 2016 - European Conference on Networks and Communications. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781509028931 ; , s. 298-301
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Konferensbidrag (refereegranskat)abstract
- 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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