Publications in peer-reviewed journals
- V. López, J. M. Gran, R. Jimenez, J. P. Fernandez–Palacios, D. Siracusa, F. Pederzolli, O. Gerstel, Y. Shikhmanter, J. Mårtensson, P. Sköldström, T. Szyrkowiec, M. Chamania, A. Autenrieth, I. Tomkos and D. Klonidis, “The Role of SDN in Application Centric IP and Optical Networks”, Journal of Green Engineering, Vol 6 (3), July 2016.
Abstract: The paper presents the ACINO concept: Transport IP/optical networks are evolving in capacity and dynamicity of configuration. This evolution gives little to no attention to the specific needs of applications, beyond increasing raw capacity. ACINO allows applications to explicitly specify requirements for requested services in terms of high-level (technology- and configuration-agnostic) requirements. These requirements are described using intents and certain primitives which facilitate translation to technology specific configuration within the ACINO infrastructure.
- V. López, D. Konidis, D. Siracusa, Ć. Rožić, I. Tomkos, J. P. Fernández-Palacios, “On the benefits of multi-layer optimization and application awareness“, Journal of Lightwave Technology (JLT) Vol. 35 (6), pp. 1274-1279 (2017).
Abstract: The proliferation of data centers deployed within the networks of national and international operators is enabling the creation of innovative added-value services offered through consumer and business applications. This trend is constantly triggering the adaptation of network operations to the needs of the applications. Indeed, they would be better served by a flexible infrastructure that accomodates and optimizes resources based on their constraints, parameters of interest and priorities. The required network optimization can be carried out considering each single layer of the infrastructure. However, multi-layer optimization gives the opportunity to further diminish CAPEX expenditures by identifying the network configuration that jointly optimizes packet and transport resources. Unfortunately, in current deployments, the planning process is not carried out considering the impact of both layer at same time.
In this paper, we walk the reader through the manifold aspects of planning in multi-layer environments. We first provide an illustrative guide by means of relevant operator-driven use-cases, also taking into account key network operations. The following step in this evolutionary path is the introduction of application-awareness in network planning, which has the potential of increasing savings, while offering a better adaptation of network services to applications’ requirements. Without such feature, the network will become an inefficient dump pipe, with dramatically increasing costs. Finally, we discuss a use case for in-operation application-aware network planning, where optimization is dynamically performed over running networks, and we present the overall operations workflow for provisioning and optimizing resources that includes it.
- Alejandro Aguado, Victor López, Jesus Martinez-Mateo, Thomas Szyrkowiec, Achim Autenrieth, Momtchil Peev, Diego Lopez, and Vicente Martin, “Hybrid Conventional and Quantum Security for Software Defined and Virtualized Networks“, Journal of Optical Communications and Networking (JOCN) Vol. 9 (10), p. 819 (2017).
Abstract: Today’s networks are quickly evolving toward more dynamic and flexible infrastructures and architectures. This software-based evolution has seen its peak with the development of the software-defined networking (SDN) and network functions virtualization (NFV) paradigms. These new concepts allow operators to automate the setup of services, thus reducing costs in deploying and operating the required infrastructure. On the other hand, these novel paradigms expose new vulnerabilities, as critical information travels through the infrastructure from central offices, down to remote data centers and network devices. Quantum key distribution (QKD) is a state-of-the-art technology that can be seen as a source of symmetric keys in two separated domains. It is immune to any algorithmic cryptanalysis and is thus suitable for long-term security. This technology is based on the laws of physics, which forbids us from copying the quantum states exchanged between two endpoints from which a secret key can be extracted. Thus, even though it has some limitations, a correct implementation can deliver keys of the highest security. In this paper, we propose the integration of QKD systems with well-known protocols and methodologies to secure the network’s control plane in an SDN and NFV environment. Furthermore, we experimentally demonstrate a workflow where QKD keys are used together with classically generated keys to encrypt communications between cloud and SDN platforms for setting up a service via secure shell, while showcasing the applicability to other cryptographic protocols.
- Thomas Szyrkowiec, Achim Autenrieth, and Wolfgang Kellerer, “Optical Network Models and Their Application to Software-Defined Network Management“, International Journal of Optics Volume 2017 (2017), Article ID 5150219, 9 pages.
Abstract: Software-defined networking is finding its way into optical networks. Here, it promises a simplification and unification of network management for optical networks allowing automation of operational tasks despite the highly diverse and vendor-specific commercial systems and the complexity and analog nature of optical transmission. Common abstractions and interfaces are a fundamental component for software-defined optical networking. Currently, a number of models for optical networks are available. They all claim to provide open and vendor agnostic management of optical equipment. In this work, we survey and compare the most important models and propose an intent interface for creating virtual topologies which is integrated in the existing model ecosystem.
- Víctor López, Rodrigo Jiménez, Óscar González de Dios, Juan Pedro Fernández-Palacios, “Control Plane architectures for Elastic Optical Networks”, Journal of Optical Communications and Networking (JOCN) accepted for publication (2017).
Abstract: Network operators have deployed optical transmission systems in their production networks for several years. The transport technology for fiber-optic transmission systems in backbone networks was Synchronous Digital Hierarchy (SDH). However, network operators start migrating such networks to deploy WDM systems to improve the utilization of the fibers. Network operators can migrate to 100Gbps solutions that can cope with the medium-term bandwidth needs. However, when evolving towards 400Gbps or 1Tbps, the utilization of the optical spectrum is less efficient if the fix grid schemas are maintained.
Elastic Optical Networks (EON) are based on a flexible allocation of the spectrum and configurable transponders. There is an unprecedented flexibility at the optical layer, thanks to the advances in the components to support EON. To take advantage of such flexibility and unlock the potential of EONs the control architecture plays a key role. This paper presents the architectural choices, including Generalized Multi-Protocol Label Switching (GMPLS), Path Computation Element (PCE) and Software Defined networking (SDN) using Transport API (Application programming interface). Moreover, this paper presents how the Open Source Netphony suite enables the validation and testing of all previous control plane architectures for EON.
- Thomas Szyrkowiec, Michele Santuari, Mohit Chamania, Domenico Siracusa, Achim Autenrieth, Victor Lopez, Joo Cho, Wolfgang Kellerer, “Automatic Intent-Based Secure Service Creation through a Multilayer SDN Network Orchestration”, Journal of Optical Communications and Networking (JOCN) accepted for publication (2018).
Abstract: Growing traffic demands and increasing security awareness is driving the need for secure services. Current solutions require manual configuration and deployment based on the customer’s requirements. In this work, we present an architecture for an automatic intent-based provisioning of a secure service in a multilayer — IP, Ethernet and optical — network while choosing the appropriate encryption layer using an open-source SDN orchestrator. The approach is experimentally evaluated in a testbed with commercial equipment. Results indicate that the processing impact of secure channel creation on a controller is negligible. As the time for setting up services over WDM is varying between technologies, it needs to be taken into account in the decision process.
Publications in conferences in 2015
- O. Gerstel and V. López, “The need for SDN in orchestration of IP over optical multi-vendor networks“, Optical Communication (ECOC), 2015 European Conference on, Valencia, 2015, pp. 1-3.
Abstract: We explain why distributed control lacks the ability to optimally control networks with multiple transport domains or both IP and optical layers. We then propose a practical architecture to fix these issues and experimentally demonstrate it over commercial IP/transport gear.
- P. Sköldström and S. Junique, “Application-centric networks and the future 5G transport“, Transparent Optical Networks (ICTON), 2015 17th International Conference on, Budapest, 2015, pp. 1-4.
Abstract: In this paper we present the Application-centric IP/Optical network concept pursued by the H2020 project ACINO, and how it could be applied as a future 5G transport network. While 5G concepts are still maturing we investigate the envisioned capabilities of a 5G network, the use-cases and the requirements different applications would have on a wired transport network for 5G. Our conclusion is that ACINO could fulfil the bandwidth, low-latency, security, and reliability requirements, in a way that differentiates between different 5G services.
- O. Gerstel, V. Lopez and D. Siracusa, “Multi-layer orchestration for application-centric networking“, Photonics in Switching (PS), 2015 International Conference on, Florence, 2015, pp. 318-320.
Abstract: We argue that the implementation of services in an IP-optical network should be driven by the needs of the specific applications, and explain why this requires a centralized orchestration architecture.
- A. Autenrieth, J. P. Elbers, T. Szyrkowiec, P. Kaczmarek and W. Kellerer, “Optical network programmability — Requirements and applications”, Photonics in Switching (PS), 2015 International Conference on, Florence, 2015, pp. 321-323.
Abstract: Datacenter operators and internet content providers require optical network programmability to efficiently interconnect distributed datacenters. This paper describes the requirements, applications and use cases for optical network programmability. Based on application scenarios, open northbound APIs with different levels of control and abstraction to address different network operator requirements which are defined. For their illustration, use cases for optical network programmability show current research directions.
Publications in conferences in 2016
- Ć. Rožić, D. Klonidis and I. Tomkos, “Latency-aware Multi-layer Network Optimization in IP-over-WDM Core Networks”, European Conference on Optical Communication (ECOC), Sept. 2016.
doi: (none yet)
Abstract: This article describes the handling of latency-sensitive traffic in an IP/optical core network. It proposes a latency-aware multi-layer network optimization approach, shows that it is superior to current solutions and evaluates the impact of propagation and electronic processing delays.
- T. Szyrkowiec, M. Santuari, M. Chamania, D. Siracusa, A. Autenrieth and V. López, “First Demonstration of an Automatic Multilayer Intent-Based Secure Service Creation by an Open Source SDN Orchestrator”, European Conference on Optical Communication (ECOC), post-Deadline Paper, Sept. 2016.
doi: (none yet)
Abstract: This article was published as a post-deadline paper. It presents an automatic intent-based encryption layer selection and configuration for a multilayer network covering IP and optical utilizing an open source SDN orchestrator. Results show that the processing impact of a secure channel creation is negligible.
- V. López, R. Vilalta, V. Uceda, A. Mayoral, R. Casellas, R. Martinez, R. Muñoz and J. P. Fernandez–Palacios, “Transport API: A Solution for SDN in Carriers Networks”, European Conference on Optical Communication (ECOC), Sep 2016.
doi: (none yet)
Abstract: This article discusses the ONF Transport API, an interface to enable control of Transport networks, including services such as topology, or connectivity setup. The paper presents the first demonstration of a connectivity service over a Dense Wavelength Division Multiplexing (DWDM) network using the Open Networking Foundation (ONF) Transport API.
- I. Maor, O. Gerstel, V. López, T, Szyrkowiec, A. Autenrieth, B. Pruessing, N. Borges, F. Fisher, G. Fabregas and J. P. Fernandez–Palacios, “First demonstration of SDN-controlled Multi-Layer Restoration and its advantage over Optical Restoration”, European Conference on Optical Communication (ECOC), Sep 2016.
doi: (none yet)
Abstract: This article presents the full implementation of a centrally orchestrated multi-layer restoration over commercial optical and IP gear. The process considers the behaviour of the IP layer and shows that compared to optical restoration, packet losses are 54% lower.
- T. Jimenez, V. López, F. Jimenez, O. Gonzalez and J. P. Fernandez, “Techno-Economic Evaluation of Optical Transport Network in Metropolitan Deployments”, European Conference on Optical Communication (ECOC), Sep 2016.
doi: (none yet)
Abstract: Optical Transport Network technology provides multiple benefits to the network operator in backbone networks. This paper presents a techno-economic comparison of optical solutions for metropolitan scenarios to assess when Optical Transport Networks should be deployed.
- V. López, D. Klonidis, D. Siracusa and J. P. Fernandez–Palacios, “Operator use cases that benefit from multi-layer optimization and application awareness”, European Conference on Optical Communication (ECOC), September, 2016.
doi: (none yet)
Abstract: This invited paper discusses multi-layer network optimization and application awareness. Multi-layer optimization enables the operators to optimize their packet and transport resources. Application awareness will provide potential savings as well as offer a better adaptation of network services to applications.
- T. Jimenez, V. López, F. Jimenez, O. Gonzalez, J.P. Fernandez–Palacios, “On the Impact of Transmission Technologies in Metropolitan Networks”, 20th International Conference on Optical Network Design and Modelling (ONDM), May 2016.
Abstract: This article assesses alternative deployments to upgrade metro networks in terms of cost efficiency. Current metro networks are deployed using IP/MPLS equipment on top of ring physical topologies. Such networks are migrating from 10G interfaces to 100G, and both the packet layer and the underlying infrastructure with its limitations must be considered.
- Ć. Rožić, D. Klonidis, I. Tomkos, “A Survey of Multi-layer Network Optimization”, 20th International Conference on Optical Network Design and Modelling (ONDM), Invited paper, May 2016.
Abstract: This invited paper gives an overview of the recent work in multi-layer network studies. First, a classification is provided, followed by the identification of the areas of study that are likely to attract more interest. Finally, a novel objective of future studies is suggested.
- F. Pederzolli, D. Siracusa, P. Sköldström, S. Junique, Ć. Rožić, D. Klonidis, T. Szyrkowiec, M. Chamania, V. Uceda, V. López, Y. Shikhmanter, O. Gerstel, “SDN application-centric orchestration for multi-layer transport networks“, International Conference on Transparent Optical Networks (ICTON), July 2016.
Abstract: This concept paper proposes the ACINO concept: an SDN-based Network Orchestrator manages multi-layer transport networks while taking explicit application requirements into account. It is based on the observation that modern IP/Optical transport networks are seldom jointly operated and optimized, and do not cater to the usually implicit requirements of applications, which ultimately drive network traffic. Network architecture and requirements are discussed; an interface is proposed to allow applications to explicitly specify their requirements in a network-agnostic manner, as well as possible strategies to optimize the network taking these requirements into account.
- D. King, C. Rotsos, A. Aguado, N. Georgalas and V. López, “The Software-Defined Transport Network: Fundamentals, Findings and Futures”, International Conference on Transparent Optical Networks (ICTON), July 2016.
Abstract: This paper introduces the concept of Software–Defined Transport Networks: SDN is an established network paradigm, architecture and principles that has attracted significant research effort in recent years. An SDN–enabled infrastructure decouples network control from forwarding and enables direct programming. Recently, there is an increasing effort to introduce SDN support in the transport layers of the network operators’ WAN infrastructure, like Layer 0 and 1. We refer to this infrastructure as the “Software Defined Transport Network”. Benefits include network management devolvement, timely connectivity provision, improved scalability, and open and flexible programmability using a well-defined API. The paper outlines the main elements of Software–Defined Transport Networks and highlights relevant Application-Based Network Operations (ABNO) enabling technologies. It also demonstrates how this technology will benefit network operators, and provides an overview of research results and deployment examples. Finally, some of the technology gaps and future research opportunities are identified.
- V. López, L. M. Contreras, O. Gonzalez de Dios, J. P. Fernandez–Palacios, “Towards a Transport SDN for Carriers Networks: An Evolutionary Perspective”, 21st European Conference on Networks and Optical Communications (NOC), invited paper, June 2016.
Abstract: This invited paper presents architectures that enable interoperability in transport networks. Some of these architectures are market ready and they have been tried in the field, while there are some approaches which are under standardization. Indeed, network operators have worked in interoperable scenarios for transport networks from several years. The main motivation is to have a rich ecosystem, which encourages the competition to have more efficient network solutions. The bandwidth increment in the transport network puts a lot of pressure to have revenues on an environment where the end-user is willing to pay less and less for the service. Software Define Networks present a new hope to achieve such a desired multi-vendor interoperability.
- A. Autenrieth, “Multilayer network planning — A practical perspective”, Optical Fiber Communications Conference and Exhibition (OFC), invited paper, March 2016.
doi: (none yet)
Abstract: This invited paper presents a pragmatic and practical multilayer network planning approach based on a candidate light path auxiliary graph model. The paper discusses how this approach can be applied to offline network planning as well as dynamic planning and provisioning of services.
- V. López, J. M. Gran, J. P. Fernandez-Palacios, D. Siracusa, F. Pederzolli, O. Gerstel, Y. Shikhmanter, J. Mårtensson, P. Sköldström, T. Szyrkowiec, M. Chamania, A. Autenrieth, I. Tomkos, D. Klonidis, “The Role of SDN in Application Centric IP and Optical Networks”, 25th European Conference on Networks and Communications (EUCNC), June 2016.
Abstract: This paper presents the ACINO concept, which is based on facilitating applications to explicitly specify requirements for requested services in terms of high-level (technology agnostic) requirements such as maximum latency or reliability. Indeed, transport IP/optical networks are evolving in capacity and dynamicity configuration. This evolution gives little to no attention to the specific needs of applications, beyond raw capacity. Using the ACINO concept, requirements are described using intents and certain primitives which facilitate translation to technology specific configuration within the ACINO infrastructure. To support this application centric approach, SDN must have a key role in this evolution. There are representative case studies where SDN gives an added value when considering not only the network but also the application layer.
- M. Santuari, T. Szyrkowiec, M. Chamania, R. Doriguzzi-Corin, V. López, D. Siracusa, “Policy-based Restoration in IP/Optical Transport Networks”, 2nd IEEE Conference on Network Softwarization (NetSoft), Demonstration paper, June 2016.
Abstract: This paper describes a demonstration presented at the 2nd IEEE Conference on Network Softwarization (NetSoft) in Seoul, South Korea, in June 2016. In case of network failure, optical and IP restoration are two different strategies that present trade-offs in terms of cost, responsiveness and offered capacity. This paper proposes the first demonstration of an IP/Optical SDN control solution (“network orchestrator”) for transport networks, which orchestrates IP or optical restoration based on the policy explicitly requested by the client application. The policy is communicated via intents, as part of the constraints that must be satisfied for a service. The orchestrator uses these intents to identify the restoration mechanism to employ in case of failure.
Publications in conferences in 2017
- Ćiril Rožić, Marco Savi, Chris Matrakidis, Dimitrios Klonidis, Domenico Siracusa, and Ioannis Tomkos, “A Framework for Dynamic Multi-layer Resource Allocation and Optimization in Application-Centric Networking”, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: In an SDN-based network, connection requests can be accommodated according to application requirements. We devise a framework where such requirements drive IP and optical network resource allocation, dynamic optimization, and instantiation through an SDN orchestrator.
- Marco Savi, Federico Pederzolli, Domenico Siracusa, “An Application-Aware Multi-Layer Service Provisioning Algorithm based on Auxiliary Graphs”, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: A novel application-aware multi-layer resource allocation algorithm is proposed. We demonstrate that it prevents the violation of application requirements (bandwidth, latency, availability, encryption), while keeping blocking probability lower than an existing algorithm.
- T. Jiménez, V. López, F. Jiménez, O. González, J.P. Fernández, “Techno-economic Analysis of Transmission Technologies in low aggregation Rings of Metropolitan Networks”, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: A techno-economic comparison of dark fiber and passive architectures to evolve low aggregation metro rings of 1G is presented. Results demonstrate that there are alternatives more cost-effective than just migrating to 10G.
- Oscar González de Dios, Victor López, Juan Pedro Fernández-Palacios, “Control Plane architectures for Flexi-Grid Networks”, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: Elastic optical networks are based on a flexible allocation of the spectrum and configurable transponders. The control architecture is key to unlock their potential. This paper presents the architectural choices, including GMPLS, SDN and TAPI.
- V. López, I. Maor, K. Sethuraman, A. Mayoral, L. Ong, K. Mrówka, F. Marques, A. Sharma, F. Bosisio, O. González de Dios, O. Gerstel, F. Druesedau, R. Vilalta, H. Silva, A. Autenrieth, N. Borges, C. Liou, G. Cazzaniga and J.P. Fernández-Palacios, “E2E Transport API demonstration in hierarchical scenarios”, demonstration paper, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: We validate the Transport API interoperability with a hierarchical orchestration layer. The demonstration shows the end-to-end provision of connections based on the topology and connectivity services of the Transport API.
- Mohit Chamania, Thomas Szyrkowiec, Michele Santuari, Domenico Siracusa, Achim Autenrieth, Victor López, Pontus Sköldström, and Stéphane Junique, “Intent-Based In-flight Service Encryption in Multi-Layer Transport Networks”, demonstration paper, Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
Abstract: We demonstrate multi-layer encrypted service provisioning via the ACINO orchestrator. ACINO combines a novel intent interface with an ONOS-based SDN orchestrator to facilitate encrypted services at IP, Ethernet and optical network layers.
- V. López, J. P. Fernandez-Palacios, T. Szyrkowiec, M. Chamania, “Multi-layer resilience schemes and their control plane support”, 13th International Conference on the Design of Reliable Communication Networks, March 2017.
doi: (none yet)
Abstract: Network operators design and manage IP/MPLS and optical networks on a per-layer basis, to the point that they are run as different business areas within the operator. However, there are clear CAPEX and OPEX savings that network operators can achieve by simplifying the network infrastructure. Moreover, the evolution of optical equipment and the introduction of network programmability are accelerating the adoption of multi-layer schemes in real networks. This paper revisions the planning process considering resilience schemes for IP and optical networks. It also presents an evolutionary view on the control plane and SDN paradigms that enable the support of multi-layer schemes in real networks.
ONDM – The on-line Proceedings are available at the IFIP Digital Library.
- V. López, R. Jimenez, O. Gonzalez de Dios, L.M. Contreras, J.P. Fernandez Palacios, “Open Source Netphony Suite: Enabling Multi-layer Network Programmability”, 21st International Conference on Optical Network Design and Modeling (ONDM), May 2017.
ieee-xplore link (for commercial use of the paper)
Abstract: Network operators must deal with multi-layer architectures in their production networks. Not so much time ago, network operators were delivering the IP traffic using ATM. ATM protocol was used to aggregate end-user traffic coming from DSL connections. This traffic was transported Synchronous Digital Hierarchy (SDH) as the standard transport technology for fiber-optic transmission systems in backbone networks. There are still networks operating this way. However, current deployments are based on an IP/MPLS layer, either on their own (using dark fiber) or supported by an optical switching network (WDM, OTN, etc.). The IP/MPLS switching and routing are the layers that take advantage of statistical multiplexing and maximize the utilization of the optical links created in the underlying layer. This multi-layer architecture requires a network programmability layer that enables the control and management of the IP and the optical resources. The advent of distributed protocols to deploy the Internet, lead on many advantages. The main one is the resiliency capability of a network, where each individual node can make their own decisions. On the other hand, a central intelligence enables to have a complete network view to propose optimal solutions to improve the resource utilization. Our proposal of multi-layer network programmability contains a hybrid approach to lever on the advantages of both paradigms. In terms on network protocols, there are to main trends binary versus REST-based. Our view is that binary protocols improve the performance at the low levels on the network, while REST-based APIs enables a faster development and network interoperability. The Open Source Netphony suite is composed by a GMPLS control plane to emulate the network elements control, a Path Computation Element with active and stateful capabilities, a Topology Module capable of importing and exporting TE information in different protocols as well as an Application-based Network Operations (ABNO) controller. This framework enables multi-layer programmability for IP and optical networks.
- A. Aguado, V. López, J. Martinez-Mateo, M. Peev, D. Lopez and V. Martin, “GMPLS Network Control Plane Enabling Quantum Encryption in End-to-End Services”, 21st International Conference on Optical Network Design and Modeling (ONDM), May 2017.
ieee-xplore link (for commercial use of the paper)
Abstract: Quantum key distribution (QKD) is a novel technology that can be seen as a synchronized source of symmetric keys in two separated domains that is immune to any algorithmic cryptanalysis. This technology makes impossible to copy the quantum states exchanged between two endpoints. Therefore, if implemented properly, QKD generates keys of the highest security based on the fundamental laws of quantum physics. No algorithmic advance would force a change of technology, as opposed to current public key cryptographic protocols, that rely on the complexity of certain mathematical problems. These protocols are at risk due to the advances in quantum computing and should be changed. On the other hand, network services are increasingly requesting more flexibility and network resources. One of the most desired capabilities is having higher level of security for the transmission between remote premises.
In this work, we propose a node architecture to provide QKD-enhanced security in end-to-end (E2E) services and analyze the control plane requirements in order to provide such services in transport networks. This work defines and demonstrates for the first time extensions for generalized multi-protocol label switching (GMPLS) networks. Results show how these new services could be integrated in existing operators’ control plane architectures.
- Marco Savi, Ciril Rozic, Chris Matrakidis, Dimitrios Klonidis, Domenico Siracusa, Ioannis Tomkos, “Benefits of Multi-Layer Application-Aware Resource Allocation and Optimization”, European Conference on Network and Communications (EuCNC), June 2017.
Abstract: Internet traffic is generated by a multitude of applications, each one with diverse service requirements in terms of bandwidth, latency, reliability, etc. Today traffic engineering techniques can provide service differentiation at the IP/MPLS layer, but not at the optical layer.
In this paper we propose a framework where application service requirements drive a dynamic multi-layer (IP/MPLS and optical) resource allocation and optimization. We compare by means of simulations such application-aware algorithmic framework with a multi-layer but application-unaware strategy. Results show that the application-aware approach, unlike the application-unaware one, is always able to guarantee the specified service requirements to those applications whose generated traffic is accepted by the network. In addition, the application-aware strategy does not consume more network resources than the application-unaware one, but only requires a network that is more dynamic and responsive.
- A. Marsico, M. Santuari, A. Ghafoor, S. Junique, P. Sköldström, “An Interactive Intent-Based Negotiation Scheme for Application-Centric Networks”, 3rd IEEE Conference on Network Softwarization (NetSoft), Demonstration paper, June 2017.
Abstract: This paper describes a demonstration of the first implementation of a resource negotiation scheme between users and a network for the provisioning of application-aware connectivity services. This active interaction enables the users, who request connectivity services with multiple application requirements, to select an alternative solution when the network does not have enough resources to satisfy the original requests.
- Ćiril Rožić, Chris Matrakidis, Dimitrios Klonidis, and Ioannis Tomkos, “Network Primitives Based on Latency and Recovery Time in Orchestrated Multi-layer Networks”, 19th International Conference on Transparent Optical Networks (ICTON), July 2017.
Abstract: Other than merely a bandwidth pipe, current and future network applications will have other requirements such as maximum end-to-end latency and the type of recovery from failure. The added complexity will require a central intelligence such as a software-defined networking (SDN) orchestrator to compute and keep track of the resources allocated to such applications. In such an SDN-orchestrated network, we examine a planning scenario where not all the requirements are known in advance. Instead, they are computed by the network orchestrator and referred to as network primitives. The primitives are then presented to the applications so that the applications know what type of service the network can offer. With our planning algorithm, we show an example of computing the primitives by analysing the guaranteed maximum end-to-end latency and post-failure recovery time.
- Pontus Sköldström, Ćiril Rožić and Juan José Pedreño Manresa, “Making Powerful Friends: Introducing ONOS and Net2Plan to Each Other”, 19th International Conference on Transparent Optical Networks (ICTON), July 2017.
Abstract: In this paper, we present our efforts for integrating network control and network planning, connecting the popular open-source ONOS control platform with Net2Plan, an open source network planner. The integration allows ONOS to use Net2Plan, combined with our resource allocation framework, as an on-line network optimization tool, calculating and re-routing paths as new requests arrive. It also lets Net2Plan obtain an up-to-date topology from ONOS. Net2Plan can then use the topology and our algorithms to perform planning operations such as investigating hypothetical questions about consequences of network failures or additional network equipment. The interface also lets the paths computed by the algorithms running on Net2Plan to be transferred to ONOS and implemented in the running network.
While we currently only support IP/Optical networks, additional layers could easily be incorporated. As an interesting side-effect, code used for network simulation can be instrumented and applied to the real network.
- Pontus Sköldström, Stéphane Junique, Abdul Ghafoor, Antonio Marsico, Domenico Siracusa, “DISMI – An intent interface for application-centric transport network services”, 19th International Conference on Transparent Optical Networks (ICTON), July 2017.
Abstract: Application-centric networking is a novel approach to construct transport networks that allows application-specific requirements to be taken into account through the entire service provisioning process: the service offered to each application is differentiated at each layer of the transport network, from IP to optical. This approach replaces the grooming of traffic with different requirements into a shared path in the transport layer, and allows for a finer control and utilization of network resources by network operators.
To make this concept viable, an interface for requesting a connectivity service by applications requires an abstraction with respect to the various underlying network technologies. Interfaces based on the concept of Intents provide such an abstraction: applications can describe what they need from the network (their requirements) rather than how to achieve them. This paper describes the design and implementation of DISMI, the Intent-based North-Bound Interface of a network controller.
- R. Doriguzzi-Corin, S. Scott-Hayward, D. Siracusa and E. Salvadori, “Application-Centric Provisioning of Virtual Security Network Functions”, 3rd IEEE International Workshop on Security in NFV-SDN (SN-2017), to be published, November 2017.
Abstract: Network Function Virtualization (NFV) enables flexible implementation and provisioning of network functions as virtual machines running on commodity servers. Due to the availability of multiple hosting servers, such network functions (also called Virtual Network Functions (VNFs)) can be placed where they are actually needed, dynamically migrated, duplicated, or deleted according to the current network requirements. However, the placement of VNFs within the physical network is one of the main challenges in the NFV domain as it has a critical impact on the performance of the network.In this work we focus on efficient placement of Virtual Security Network Functions (VSNFs), i.e. the placement of virtual network functions whose purpose is to prevent or mitigate network security threats. In this regard, we tackle the placement problem not only considering performance optimization aspects, but also trying to find solutions that are consistent from the security viewpoint. Specifically, the main contribution of this paper is the formulation of the placement problem by taking into account both Security and Quality of Service (QoS) requirements of user applications.
Papers accepted for publication in conferences in 2018
- A. Marsico, M. Savi, D. Siracusa, E. Salvadori, “An Automated Service-downgrade Negotiation Scheme for Application-centric Networks”, Optical Fiber Communications Conference and Exhibition (OFC), accepted for publication, March 2018.
Abstract: In this paper, we propose a novel negotiation scheme for an application-driven relaxation of different requirements in multi-layer networks. Simulative results show that it improves service acceptance while keeping requirements’ degradation much lower than applications’ worst-case acceptable values.
- I. Tomkos, C. Rozic, M. Savi, P. Skoldstrom, V. Lopez, M. Chamania, D. Siracusa, C. Matrakidis, D. Klonidis, “Application aware multilayer control and optimization of elastic WDM switched optical networks”, Optical Fiber Communications Conference and Exhibition (OFC), invited paper, March 2018.
- Federico Pederzolli, Mohit Chamania, Michele Santuari, Thomas Szyrkowiec, Chris Matrakidis, Ciril Rozic, Dimitrios Klonidis, Victor Lopez, Domenico Siracusa, “Disaggregating Optical Nodes in a Multi-Layer SDN Orchestrator for the Integration of an In-Operation Planning Tool”, Optical Fiber Communications Conference and Exhibition (OFC), accepted for publication, March 2018.
Abstract: Optical disaggregation can provide the intermediate models required by In-Operation planning to compute feasible configurations in IP/Optical networks. In this paper, we demonstrate disaggregation on a real SDN-orchestrated testbed, and quantify its benefits and costs.
- The ACINO concept paper: This paper describes the main concepts that are being developed by the ACINO consortium.
doi: 10.5281/zenodo.49273 (hosted at zenodo.org)
- D. Siracusa, “ACINO: Application-Centric IP/Optical Network Orchestration”, ACINO public presentation (2015).
doi: 10.5281/zenodo.31376 (hosted at zenodo.org)
Abstract: This is a public presentation of the H2020 European project ACINO (Application-Centric IP/Optical Network Orchestration)
- M. Chamania, “The ACINO project”, talk at the ECOC Symposium (2017).
doi: 10.5281/zenodo.31376 (hosted at zenodo.org)
Abstract: This is a public presentation of the H2020 European project ACINO
- Ioannis Tomkos, Dimitrios Klonidis and Ćiril Rožić, “SDN as an enabler of application awareness and multi-layer network optimization”, invited talk at the Forum for European ICT and Media Professionals (FITCE), (2016).
- Juan Pedro Fernandez Palacios, “Telefónica Software Defined Transport Network Vision: a journey to a new network”, Talk at the Network Virtualization Europe Conference (June 2017).
- Victor López, “Transport SDN – What is Ready, What is Missing?“, panel presentation at the Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
- Victor López, “OIF Interop – The Key to Unlocking the Benefits of SDN“, panel presentation at the Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
- Victor López, “SDN & Optics — What is the Business Case?“, panel presentation at the Optical Fiber Communications Conference and Exhibition (OFC), March 2017.
- Marco Savi, Antonio Marsico, Domenico Siracusa and Elio Salvadori, “On Resource Negotiation in Application-aware Networks”, 21st International Conference on Optical Network Design and Modeling (ONDM), invited talk, May 2017.
- Domenico Siracusa, “Application-Centric Transport Networking”, Terena Networking Conference (TNC 17), May 2017.
Abstract: Service providers typically operate large and complex multi-layer/multi-vendor networks based on IP/Optical systems in which the different technological layers are seldom jointly managed. In this context, a logically centralized component, called network orchestrator, can help to achieve dynamic control, planning and optimization for optimal service accommodation, according to both the availability of resources and the needs of the applications. The presentation will provide insight to the relevant work taking place in the EC-funded research and innovation project ACINO, which is investigating the introduction of the application-centric concept in multi-layer IP/Optical networks. By means of its network orchestration solution, ACINO aims at differentiating the service offered to each application at each layer of the transport network. The proposed concept has been already demonstrated over a real IP/optical testbed with two relevant use-cases for network operators: policy-based reactive failure recovery and secure transmission as a service.
- Salvadori, M. Savi, D. Siracusa, “Bringing application-awareness into future transport networks for the 5G era”, BalkanCom 2017.
- Siracusa, R. Doriguzzi Corin, E. Salvadori, “Application-centric resource orchestration enabling advanced 5G services”, SDN NFV World Congress 2017.
- Savi, C. Rozic, P. Sköldström, D. Klonidis, A. Autenrieth, V. Lopez, D. Siracusa, I. Tomkos, “ACINO: From application blending to application centricity“, Tutorial, ONDM (2017).