Demonstration of dynamic restoration in segment routing multi-layer SDN networks

Dynamic traffic recovery is designed and validated in a multi-layer network exploiting an SDN-based implementation of Segment Routing. Traffic recovery is locally performed from the node detecting the failure up to the destination node without involving the SDN controller. Experimental results demonstrate recovery time within 50 ms

A Scalable Telemetry Framework for Zero Touch Optical Network Management

The interest about Zero Touch Network and Service Management (ZSM) is rapidly emerging. As defined by ETSI, the ZSM architecture is based on a closed-loop/feedback control of the network and the services. Such closed-loop control can be based on the Boyd's Observe Orient Decide and Act (OODA) loop that matches some specific management functions such as Data Collection, Data Analytics, Intelligence, Orchestration and Control. An efficient implementation of such control loop allows the network to timely adapt to changes and maintain the required quality of service.Many solutions for collecting network parameters (i.e., implementing ZSM data collection) are proposed that fall under the broad umbrella of network telemetry. An example is the Google gRPC, that represented one of the first solutions to provide a framework for data collection. Since then, the number of available frameworks is proliferating. In this paper we propose the utilisation of Apache Kafka as a framework for collecting optical network parameters. Then, the paper goes beyond that by proposing and showing how Apache Kafka can be effective for supporting data exchange and management of whole ZSM closed-loop.Experimental evaluation results show that, even when a large number of data are collected, the solution is scalable and the time to disseminate the parameter values is short. Indeed, the difference between the reception time and the generation time of data is, on average, 40-50ms when about four thousand messages are generated

Orchestrating Lightpath Recovery and Flexible Functional Split to Preserve Virtualized RAN Connectivity

In the next-generation radio access network (NG RAN), the next-generation evolved NodeBs (gNBs) will be, likely, split into virtualized central units (CUs) and distributed units (DUs) interconnected by a fronthaul network. Because of fronthaul latency and capacity requirements, optical metro-ring networks are among the main candidates for supporting converged 5G and non-5G services. In this scenario, a degradation in the quality of transmission of the lightpaths connecting DU and CU can be revealed (or anticipated) based on monitoring techniques. Thus, the lightpath transmission parameters can be adapted to maintain the required bit error rate (BER). However, in specific cases, the original requested capacity between DU and CU could be not guaranteed, thus impacting the service. In this case, another DU–CU connectivity should be considered, relying on a change of the so-called functional split. This study proposes a two-step recovery scheme orchestrating lightpath transmission adaptation and functional split reconfiguration to guarantee the requested connectivity in a virtualized RAN fronthaul. Results show that, for the connections that cannot be transported by the original lightpath, a graceful degradation followed by a recovery is possible within tens of seconds.This work was partly funded by the project H2020-ICT-2016-2 “5G-TRANSFORMER” (761536

First Demonstration of MANTRA IPoWDM Convergent SDN Architecture using SONiC White Box and 400ZR/ZR+ Pluggables

In this work, the MANTRA (Metaverse ready Architectures for Open Transport) "Single"IP over Wavelength Division Multiplexing (IPoWDM) architecture is implemented and experimentally demonstrated in a network testbed employing three SDN Controllers (IP, Optical and Hierarchical) and Software for Open Networking in the Cloud (SONiC) white box equipped with 400ZR and 400ZR+ coherent pluggable transceivers

Le attività motorie e sportive nella scuola primaria. Una sinergia scuola-famiglia per la formazione del bambino.

3noreservedLa seguente ricerca, fondata sulla ricchezza educativa delle attività motorie e sportive, riconosce la valenza del ruolo dei genitori in tale processo e valorizza la proficuità del rapporto istituzionale basato su sinergia culturale e complicità di azione. Dato per scontato, infatti, che nella persona non esistono separazioni e, pertanto, il corpo non è il “vestito” di ogni individuo, ma piuttosto il suo modo globale di essere nel mondo e di agire nella società, la corporeità, le diverse forme intellettive e l’affettività partecipano allo sviluppo del bambino, la cui evoluzione rappresenta il risultato dell’esistenza di un rapporto tra l’Io, l’ambiente e gli altri. Se l’atto psicomotorio, infatti, è guidato dal cervello e questo, a sua volta, necessita di stimoli precisi - di tipo esterno, propriocettivo e di forte spinta motivazionale per poter formulare risposte - un genitore di un bambino della scuola primaria deve essere consapevole del forte condizionamento del ruolo che riveste la relazione quotidiana domiciliare attraverso linguaggi non verbali comuni. È in famiglia che si scrive il destino dei propri figli: un clima di autorealizzazione si costruisce insieme, giorno dopo giorno, attraverso l’esempio vitale e coerente del genitore, specie attraverso la comunicazione analogica.mixedF. GOMEZ PALOMA; R. SGAMBELLURI; P. AIELLO;GOMEZ PALOMA, F.; Sgambelluri, R.; Aiello, P

Coordinating Pluggable Transceiver Control in SONiC-based Disaggregated Packet-Optical Networks

Effective control of pluggable transceivers in SONiC-based packet-optical nodes is demonstrated. A workflow for multi-layer recovery upon soft failure detection is validated, showing no traffic disruption and fast node-driven coordination between packet and optical operations