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Takefusa A.,Japan National Institute of Advanced Industrial Science and Technology | Haga J.,Japan National Institute of Advanced Industrial Science and Technology | Toseef U.,EICT | Ikeda T.,KDDI | And 3 more authors.
Proceedings - 2015 IEEE/ACM 8th International Conference on Utility and Cloud Computing, UCC 2015 | Year: 2015

FELIX federates existing Future Internet (FI) experimental facilities across continents to build a test environment for large-scale SDN experiments. The management framework developed by FELIX allows the execution of experimental network services in a distributed environment comprised of heterogeneous resources. The demonstration described in this paper showcases the implementation of the FELIX architecture over the federated experimental facilities across Japan and Europe leveraging on both the infrastructure resources and the FELIX management stack. The presented use-case also provides an important experimental scenario for data center operators who are developing Business Continuity Planning for IT services. © 2015 IEEE.


Toseef U.,EICT | Fernandez C.,I2CAT | Bermudo C.,I2CAT | Carrozzo G.,NXW | And 10 more authors.
Proceedings - European Workshop on Software Defined Networks, EWSDN | Year: 2015

The development of test environments as close as possible to the real world scenarios is becoming a fundamental requirement in designing innovative network applications. This environment must be fully configurable and reliable enough to provide similar results in multiple experiment runs. The federation of existing Future Internet (FI) test beds is an initiative tofu fill these strict requirements. The FELIX project aims to define, implement, and deploy a control and monitoring framework which allows experimenters to execute their network services in a distributed environment spread across two continents, i.e. Europe and Asia. This paper describes the architecture of the software components developed to manage heterogeneous resources that constitute the FELIX infrastructure, i.e. Computing, SDN and transport resources. This article introduces the components of a modular architecture with particular emphasis on the provided functionalities, the exported interfaces, the dependencies and the relationship between the internal building blocks. Details of the implementation choices and the workflows to realize user requests are also presented. © 2015 IEEE.


Carrozzo G.,Nextworks S.r.l. | Monno R.,Nextworks S.r.l. | Belter B.,PSNC | Krzywania R.,PSNC | And 8 more authors.
2014 International Conference on Smart Communications in Network Technologies, SaCoNeT 2014 | Year: 2014

International cooperation on Software-Defined Networking (SDN), crossing the boundaries of Europe, the Americas and Asia, builds a strong foundation for pursuing experimental research through advanced programmable network testbeds. The EU-Japan jointly-funded project FELIX (FEderated Testbeds for Large-scale Infrastructure eXperiments) considers the definition of a common framework for federated Future Internet (FI) testbeds, which are dispersed across continents. This framework will enable an experimenter to i) request and obtain resources across different testbed infrastructures dynamically; ii) manage and control the network paths connecting the federated SDN testbed infrastructures; iii) monitor the underlying resources; and iv) use distributed applications executed on the federated infrastructures. This paper details six use cases that will be employed to validate the FELIX architecture and software platforms. We present our analysis and end-user considerations, highlighting the necessity to have a global vision of issues within the testbed network. Resource reachability and coherent use of physical connections are key factors in the use cases. This is particularly important when considering the simultaneous use of different technologies such as OpenFlow and the Network Service Interface (NSI) among others. © 2014 IEEE.


John W.,Ericsson AB | Pentikousis K.,EICT | Agapiou G.,OTE Research | Jacob E.,University of the Basque Country | And 6 more authors.
SDN4FNS 2013 - 2013 Workshop on Software Defined Networks for Future Networks and Services | Year: 2013

Network Service Chaining (NSC) is a service deployment concept that promises increased flexibility and cost efficiency for future carrier networks. NSC has received considerable attention in the standardization and research communities lately. However, NSC is largely undefined in the peer-reviewed literature. In fact, a literature review reveals that the role of NSC enabling technologies is up for discussion, and so are the key research challenges lying ahead. This paper addresses these topics by motivating our research interest towards advanced dynamic NSC and detailing the main aspects to be considered in the context of carrier-grade telecommunication networks. We present design considerations and system requirements alongside use cases that illustrate the advantages of adopting NSC. We detail prominent research challenges during the typical lifecycle of a network service chain in an operational telecommunications network, including service chain description, programming, deployment, and debugging, and summarize our security considerations. We conclude this paper with an outlook on future work in this area.


Kostopoulos A.,Ote Sa Research | Agapiou G.,Ote Sa Research | Kuo F.-C.,EICT | Pentikousis K.,EICT | And 12 more authors.
2016 23rd International Conference on Telecommunications, ICT 2016 | Year: 2016

Efficient coordination among network elements and optimal resource utilization in heterogeneous mobile networks (HMNs) is a key factor for the success of future 5G systems. The COHERENT project focuses on developing an innovative programmable control and coordination framework which is aware of the underlying network topology, radio environment and traffic conditions, and can efficiently coordinate available spectrum resources. In this paper, we provide a set of scenarios and use cases that the COHERENT project intends to address. © 2016 IEEE.


Haleplidis E.,University of Patras | Joachimpillai D.,Verizon United States | Salim J.H.,Mojatatu Networks | Pentikousis K.,EICT | And 2 more authors.
2016 23rd International Conference on Telecommunications, ICT 2016 | Year: 2016

This paper explores how can one virtualize a mobile packet core infrastructure using the IETF Forwarding and Control Element Separation (ForCES) standard and capitalizing on recent advances in networking, namely Software Defined Networking (SDN) and Network Functions Visualization (NFV). As a case in point we build a proof-of-concept (PoC) implementation of the currently standardized 3GPP Evolved Packet Core (EPC). In doing so, we separate the control from the forwarding plane in SDN terms and enable dynamic deployment and integration of new functionality as softwarized network functions running on off-the-shelf hardware as advocated by NFV. We discuss our implementation experience with the PoC and provide insights for building open 5G mobile infrastructures. © 2016 IEEE.


Haleplidis E.,University of Patras | Denazis S.,University of Patras | Koufopavlou O.,University of Patras | Joachimpillai D.,Verizon Wireless | And 4 more authors.
Proceedings - 2014 3rd European Workshop on Software-Defined Networks, EWSDN 2014 | Year: 2014

Networking has seen lately a surge in research and innovation with the re-emergence of network programmability in the form of Software-Defined Networking (SDN), a new approach for network data path configuration. SDN provides an abstraction model of the Forwarding Plane and separates it from the Control Plane using open APIs. In parallel, major telecom operators have embarked on an effort to bring the advantages of virtualization to carrier network infrastructures. Part of this effort was invested in establishing the Network Function Virtualization (NFV) Industry Specification Group (ISG) at the European Telecommunications Standards Institute (ETSI). The NFV goal is to define how Network Functions (ranging from firewalls and load-balancers to routers and access elements) can be virtualized and run as software on high-volume servers instead of specialized hardware. This paper treats SDN and NFV as complementary concepts that together form a bigger picture in the domain of future carrier networks and discusses the complete lifecycle of such a network. In this context we present how ForCES can be used as the foundation for SDN-enhanced NFV and describe the blueprint for the Proof of Concept (PoC) prototype which has been introduced to the NFV ISG. A key goal of this paper is to concisely position carrier NFV and SDN activities under a unified framework. © 2014 IEEE.


Fernandez C.,I2CAT | Bermudo C.,I2CAT | Carrozzo G.,Nextworks s.r.l. | Monno R.,Nextworks s.r.l. | And 8 more authors.
International Journal of Parallel, Emergent and Distributed Systems | Year: 2015

Programmable networks are a substantial part of current R&D on future internet (FI) in Europe and worldwide, with considerable impact generated by large-scale test bed infrastructures. In such test beds, researchers validate proof-of-concept prototypes for new algorithms and mechanisms for efficiently controlling and managing network resources. One of the key domains for FI research is software-defined networking (SDN), which creates innovations in existing Internet architectures by shifting the control and logic outside the network equipment to Data Centres. International cooperation among leading research centres in Europe, Americas and Asia is key to validate SDN foundations and tools. EU and Japan have jointly funded the FELIX project (federated test-beds for large-scale infrastructure experiments), which defines a common control and orchestration framework to manage federated FI test beds across continents. This framework enables an experimenter to (i) request and obtain resources across different test bed infrastructures dynamically; (ii) manage and control the network paths connecting the federated SDN test beds; (iii) monitor the underlying resources and (iv) use distributed applications executed on the federated infrastructures. This paper describes the high-level architecture of the FELIX framework and details six use cases that will be employed for validation. We present our analysis and end-user considerations, highlighting the necessity for resource accessibility and coherent use of physical connections over a large-scale test bed where different control technologies such as OpenFlow and the network service interface (NSI) are simultaneously used. © 2015 Taylor & Francis


Sousa B.,University of Coimbra | Pentikousis K.,EICT | Curado M.,University of Coimbra
Proceedings of the 2015 IFIP/IEEE International Symposium on Integrated Network Management, IM 2015 | Year: 2015

Network management includes several operations that aim to maximize Fault, Configuration, Account, Performance and Security (FCAPS) goals. Performance improvement often relies on multiple criteria, leading to NP-Hard optimisation problems. Very often, optimization mechanisms are narrowed to a specific scenario or present deployment issues due to their associated complexity. Others, despite reducing complexity, have accuracy issues that lead to the selection of non-optimal solutions. MeTHODICAL is an accurate optimisation technique for path selection in multihoming scenarios that enhances network management FCAPS goals by being flexible enough to operate on distinct scenarios, supporting different applications and services and with reduced deployment complexity. © 2015 IEEE.

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