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Dependability of computer and communication networks is an important aspect of the customer-provider relationship in the telecommunication industry. Considering the increasing interest in Software-Defined Networking (SDN) technologies, as well as unclear understanding of dependability in the context of traffic flows in such networks, it is not clear how to define the related objectives in Service...
Service Assurance (SA) is a significant part of Network Function Virtualization (NFV) to enable automated and efficient service delivery from end to end (E2E). In NFV, SA should be integrated into the design and development loop from the beginning. However, it sees slower pace than other NFV management and orchestration (MANO) components. Most of present NFV-SA solutions are partial and do not provide...
Software-Defined Networking (SDN) is a new paradigm that promises to enhance network flexibility and innovation. However, operators need to thoroughly assess its advantages and threats before they can implement it. Robustness and fault tolerance are among the main criteria to be considered in such assessment. The currently available SDN controllers offer different fault tolerance mechanisms, but there...
Software-Defined Networking (SDN) promises to improve the programmability and flexibility of networks, but it may also bring new challenges that need to be explored. The main objective of this paper is to present a quantitative assessment of the properties of SDN backbone networks to determine whether they can provide similar availability to the traditional IP backbone networks. To achieve this goal,...
The dependability of ICT systems is vital for today's society. However, operational systems are not fault free. Providers and customers have to define clear availability requirements and penalties on the delivered services by using SLAs. Fulfilling the stipulated availability may be expensive. The lack of mechanisms that allow a fine control of the SLA risk may lead to over-dimension the provided...
Failures are undesirable events that should be always prevented. This paper agrees with this concept, but it is also aware that failures are unavoidable events. The main objective of this paper is to show how the failure handling through clever fault management mechanisms produces a direct positive impact on energy efficient cloud computing deployment. We address the virtual machine consolidation...
SLAs are common means to define specifications and requirements of cloud computing services, where the guaranteed availability is one of the most important parameters. Fulfilling the stipulated availability may be expensive, due to the cost of failure recovery software, and the amount of physical equipment needed to deploy the cloud services. Therefore, a relevant question for cloud providers is:...
Service Level Agreements (SLAs) are used to define obligations between network/service providers and customers in business relationships. The terms that define the guaranteed availability for a given period are fundamental to these contracts. The appropriate selection of the availability to be promised is still an open challenge for network operators due to: (i) SLAs are defined for finite periods,...
SLAs are common means to define specifications and requirements of cloud computing services in business relationships. The terms that define the guaranteed availability for a given period are fundamental to these contracts. In this context, a natural question for cloud providers is: How to guarantee the availability promised? This paper studies the level of availability offered to a virtual machine...
Network operators have to allocate connections fulfilling availability requirements stipulated in SLAs for a finite interval. However, modeling accurately the transient solution of repairable systems is still an open challenge. We study the SLA penalty scheme and propose a model to allocate connections with SLA requirements, maximizing the operator profit through a two-stage stochastic program. Our...
Service Level Agreements (SLAs) are common means to define obligations between network/service providers and customers in business relationships. The terms that define the guaranteed availability for a given period are important elements of these contracts. The appropriate selection of values is difficult due to the large number of variables involved, the complexities of the network and service provision...
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