The Experts below are selected from a list of 2666865 Experts worldwide ranked by ideXlab platform
Guy Pujolle - One of the best experts on this subject based on the ideXlab platform.
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Distributed Policy Management Protocol for Self-Configuring Mobile Ad Hoc Networks
2008Co-Authors: Mouna Ayari, Farouk Kamoun, Guy PujolleAbstract:Mobile ad hoc networks (MANETs) are fundamentally different from wired networks. They are autonomously formed with a collection of mobile nodes without any preexisting infrastructure or administrative support. In the last few years, Policy-Based Network Management (PBNM) has gained a considerable interest in order to reach adaptive and automated Management goals in MANETs. Previous work in this field either cluster-based or hierarchical architectures are highly dependent of the network topology. A distributed approach with a high degree of autonomy and self-Management is still lacking. In this paper, we give an overview of existing Policy-Based Management solutions and we focus on some of their limitations. We outline the need of incorporating self-configuration property in the design of MANETs. Then, we present a new protocol for distributing policies and high-level goals over all nodes in the network. Simulation-based performance evaluation results are described and analyzed.
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Policy-Based Service Provisioning Architecture for Hybrid Photonic Networks
2006Co-Authors: Belkacem Daheb, Guy Pujolle, Wissam Fawaz, Ken ChenAbstract:Optical networks are becoming an inevitable technology in the next generation Internet. Optical WDM networks require a control network for automatic and rapid configuration. A control plane is under standardization by the Internet Engineering Task Force (IETF) under the name generalized multiprotocol label switching (GMPLS). However, this control plane is unaware of the specifications of the services to be enforced. This work presents a Policy-Based Management architecture adapted to an emerging kind of optical networks called hybrid photonic networks. Contributing to network flexibility, we present extensions to the Management plane of these transparent wavelength and switching capable networks that provide the means to leverage their inherent capabilities. The proposed Management architecture would provide optical network operators with the possibility to provision optical services, defined through high level service contracts, in an efficient and dynamic way.
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Business Aware Policy Based Management
2006Co-Authors: Issam Aib, Raouf Boutaba, Mathias Sallé, Claudio Bartolini, Abdel Boulmakoul, Guy PujolleAbstract:In this paper, we introduce a business aware framework for the Policy-Based Management of IT Systems and its application to utility computing environments. The framework couples two main subsystems on top of an IETF-like Policy-Based resource control layer. They are MBO (Management by Business Objectives) where the decision ability supported by analysis of business objectives resides, and GSLA (Generalized SLA), an advanced framework for SLA driven Management that lends itself quite naturally to the derivation of IT Management policies from the SLAs that the enterprise has contracted. We discuss the advantages and the limitations of the state-of-art Policy-Based approach to systems Management, mainly the lack of business and service level context to drive policy-related decisions at system runtime. We then explain how this is remedied in our framework through the interaction mechanism between the reactive Policy-Based resource control layer and the more proactive business driven decision making engine.
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Policy-Based Hybrid Hierarchical Optical Networks
2004Co-Authors: Belkacem Daheb, Wissam Fawaz, Olivier Audouin, Bela Barde, Ken Chen, Guy PujolleAbstract:This document presents provisioning strategies for emerging hybrid optical networks. The idea is to make use of Policy-Based Management that guides the behavior of a network through high-level declarative directives. In this regard and in the context of hybrid optical networks, policy rules are employed as the main means to extend the functionality of the control system and to complement its role in order to achieve the service provisioning.
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Policy-Based Provisioning in Hybrid Photonic Networks
2004Co-Authors: Wissam Fawaz, Belkacem Daheb, Olivier Audouin, Bela Barde, Ken Chen, Guy PujolleAbstract:The aim of this work is to present provisioning strategies for GMPLS-enabled Hybrid Photonic Networks (HPN). Contributing to network flexibility, the paper presents extensions to the Management system of these transparent wavelength and switching capable networks that provide the means to leverage their inherent capabilities. The paper first addresses the motivation and utility of HPN. Building on this information, it goes on with the constraints to be applied in provisioning of those networks. Finally, to achieve the strategic goal of provisioning, a protocol independent Policy-Based Management (PBM) approach is proposed with the corresponding policy control framework and relevant policy categories.
Dawn M. Tilbury - One of the best experts on this subject based on the ideXlab platform.
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NOMS - Using MIMO feedback control to enforce policies for interrelated metrics with application to the Apache Web server
NOMS 2002. IEEE IFIP Network Operations and Management Symposium. ' Management Solutions for the New Communications World'(Cat. No.02CH37327), 2002Co-Authors: Yixin Diao, N. Gandhi, Joseph L. Hellerstein, Sujay Parekh, Dawn M. TilburyAbstract:Policy-Based Management provides a means for IT systems to operate according to business needs. Unfortunately, there is often an "impedance mismatch" between the policies administrators want and the controls they are given. Consider the Apache Web server. Administrators want to control CPU and memory utilizations, but this must be done indirectly by manipulating tuning parameters such as MaxClients and KeepAlive. There has been much interest in using feedback control to bridge the impedance mismatch. However, these efforts have focused on a single metric that is manipulated by a single control and hence have not considered interactions between controls such as those that are common in computing systems. This paper shows how multiple-input, multiple-output (MIMO) control theory can be used to enforce policies for interrelated metrics. MIMO is used both to model the target system, Apache in our case, and to design feedback controllers. The MIMO model captures the interactions between KA and MC, and can be used to identify infeasible metric policies. In addition, MIMO control techniques can provide considerable benefit in handling trade-offs between speed of metric convergence and sensitivity to random fluctuations while enforcing the desired policies.
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using mimo feedback control to enforce policies for interrelated metrics with application to the apache web server
Network Operations and Management Symposium, 2002Co-Authors: Yixin Diao, N. Gandhi, Joseph L. Hellerstein, Sujay Parekh, Dawn M. TilburyAbstract:Policy-Based Management provides a means for IT systems to operate according to business needs. Unfortunately, there is often an "impedance mismatch" between the policies administrators want and the controls they are given. Consider the Apache Web server. Administrators want to control CPU and memory utilizations, but this must be done indirectly by manipulating tuning parameters such as MaxClients and KeepAlive. There has been much interest in using feedback control to bridge the impedance mismatch. However, these efforts have focused on a single metric that is manipulated by a single control and hence have not considered interactions between controls such as those that are common in computing systems. This paper shows how multiple-input, multiple-output (MIMO) control theory can be used to enforce policies for interrelated metrics. MIMO is used both to model the target system, Apache in our case, and to design feedback controllers. The MIMO model captures the interactions between KA and MC, and can be used to identify infeasible metric policies. In addition, MIMO control techniques can provide considerable benefit in handling trade-offs between speed of metric convergence and sensitivity to random fluctuations while enforcing the desired policies.
George Pavlou - One of the best experts on this subject based on the ideXlab platform.
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policy conflict analysis for diffserv quality of service Management
IEEE Transactions on Network and Service Management, 2009Co-Authors: Marinos Charalambides, Emil Lupu, George Pavlou, Paris Flegkas, Javier Rubioloyola, Arosha K Bandara, Alessandra Russo, Naranker Dulay, Morris SlomanAbstract:Policy-Based Management provides the ability to (re-)configure differentiated services networks so that desired Quality of Service (QoS) goals are achieved. This requires implementing network provisioning decisions, performing admission control, and adapting bandwidth allocation to emerging traffic demands. A Policy-Based approach facilitates flexibility and adaptability as policies can be dynamically changed without modifying the underlying implementation. However, inconsistencies may arise in the policy specification. In this paper we provide a comprehensive set of QoS policies for managing Differentiated Services (DiffServ) networks, and classify the possible conflicts that can arise between them. We demonstrate the use of Event Calculus and formal reasoning for the analysis of both static and dynamic conflicts in a semi-automated fashion. In addition, we present a conflict analysis tool that provides network administrators with a user-friendly environment for determining and resolving potential inconsistencies. The tool has been extensively tested with large numbers of policies over a range of conflict types.
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Exploiting Context-Awareness for the Autonomic Management of Mobile Ad Hoc Networks
Journal of Network and Systems Management, 2007Co-Authors: Apostolos Malatras, Antonios M. Hadjiantonis, George PavlouAbstract:Mobile Ad Hoc Networks (MANETs) are characterized by a degree of dynamicity that can result in significant drawbacks regarding their useful deployment. The fact they are formed spontaneously, comprising possibly heterogeneous devices, hinders further their wide adoption. In this paper we present the design and implementation of a system that exploits context-awareness and couples it with Policy-Based Management in order to enable the self-Management of MANETs. The key idea is to support self-configuration by being adaptive to varying conditions modeled as context, with high-level Management policies driving self-configuration towards particular goals. We propose the Management of the MANET in a hierarchical but also distributed manner through a dynamically constructed set of manager nodes. We present and evaluate our work on context-awareness and context dissemination in MANETs through simulation and also by deploying the prototype system in our experimental MANET testbed for a proof-of-concept application scenario.
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a functional solution for goal ooriented policy refinement
IEEE International Workshop on Policies for Distributed Systems and Networks, 2006Co-Authors: Javier Rubioloyola, Joan Serrat, Paris Flegkas, Marinos Charalambides, George PavlouAbstract:Policy refinement is a key but still unsolved area of policy based Management. Goal oriented requirements engineering methodologies have been suggested as a prominent alternative to address policy refinement. Practical approaches that capture the administrative requirements and enable systematic policy refinement are still missing although such integrated solutions are rather convenient to make Policy-Based Management systems really useful. In this paper we present a functional solution for goal oriented policy refinement grounded in linear temporal logic and reactive systems analysis techniques. We describe the technical foundations and demonstrate how these were used to develop an integrated solution for policy refinement, focusing on the details of the implemented prototype. Our policy analysis techniques that enable systematic policy refinement are demonstrated through a scenario applied to the domain of QoS Management for Differentiated Services (DiffServ) networks.
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NOMS - GOREMOCH: A Distributed Goal-oriented Policy Refinement Environment
2006 IEEE IFIP Network Operations and Management Symposium NOMS 2006, 2006Co-Authors: Javier Rubio-loyola, Joan Serrat, Paris Flegkas, Marinos Charalambides, George PavlouAbstract:Goal-oriented requirements engineering methodologies have been suggested as an alternative to address the policy refinement paradigm. Moreover, practical approaches that capture the administrative and technical requirements to make policy refinement a systematic process are still missing although such integrated solutions are rather convenient to make Policy-Based Management systems really useful. In this paper, we present GOREMOCH, a goal-oriented policy refinement environment grounded in goal-oriented requirements engineering methodologies, linear temporal logic and reactive systems analysis techniques. We describe the rationale of this integrated solution and the necessary mechanisms to achieve policy refinement in a systematic manner.
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policy conflict analysis for quality of service Management
IEEE International Workshop on Policies for Distributed Systems and Networks, 2005Co-Authors: Marinos Charalambides, Emil Lupu, George Pavlou, Paris Flegkas, Morris Sloman, Arosha K Bandara, Alessandra Russo, N Dulav, Javier RubioloyolaAbstract:Policy-Based Management provides the ability to (re-) configure differentiated services networks so that desired quality of service (QoS) goals are achieved. Relevant configuration involves implementing network provisioning decisions, performing admission control, and adapting bandwidth allocation dynamically according to emerging traffic demands. A Policy-Based approach facilitates flexibility and adaptability in that the policies can be changed without changing the implementation. However, as with any other complex system, conflicts and inconsistencies may arise in the policy specification. In this work, we concentrate on the policy conflicts that may occur for static resource Management aspects of QoS provisioning, known as network dimensioning. The paper shows how conflict detection can be achieved using event calculus in conjunction with abductive reasoning techniques to detect the existence of potential conflicts in partial specification and generate explanations for the conditions under which the conflicts arise. We finally present some conflict detection examples from our initial implementation of a policy conflict analysis tool. Although we focus on network dimensioning, many of the types of conflicts we illustrate could arise in other applications.
Yixin Diao - One of the best experts on this subject based on the ideXlab platform.
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NOMS - Using MIMO feedback control to enforce policies for interrelated metrics with application to the Apache Web server
NOMS 2002. IEEE IFIP Network Operations and Management Symposium. ' Management Solutions for the New Communications World'(Cat. No.02CH37327), 2002Co-Authors: Yixin Diao, N. Gandhi, Joseph L. Hellerstein, Sujay Parekh, Dawn M. TilburyAbstract:Policy-Based Management provides a means for IT systems to operate according to business needs. Unfortunately, there is often an "impedance mismatch" between the policies administrators want and the controls they are given. Consider the Apache Web server. Administrators want to control CPU and memory utilizations, but this must be done indirectly by manipulating tuning parameters such as MaxClients and KeepAlive. There has been much interest in using feedback control to bridge the impedance mismatch. However, these efforts have focused on a single metric that is manipulated by a single control and hence have not considered interactions between controls such as those that are common in computing systems. This paper shows how multiple-input, multiple-output (MIMO) control theory can be used to enforce policies for interrelated metrics. MIMO is used both to model the target system, Apache in our case, and to design feedback controllers. The MIMO model captures the interactions between KA and MC, and can be used to identify infeasible metric policies. In addition, MIMO control techniques can provide considerable benefit in handling trade-offs between speed of metric convergence and sensitivity to random fluctuations while enforcing the desired policies.
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using mimo feedback control to enforce policies for interrelated metrics with application to the apache web server
Network Operations and Management Symposium, 2002Co-Authors: Yixin Diao, N. Gandhi, Joseph L. Hellerstein, Sujay Parekh, Dawn M. TilburyAbstract:Policy-Based Management provides a means for IT systems to operate according to business needs. Unfortunately, there is often an "impedance mismatch" between the policies administrators want and the controls they are given. Consider the Apache Web server. Administrators want to control CPU and memory utilizations, but this must be done indirectly by manipulating tuning parameters such as MaxClients and KeepAlive. There has been much interest in using feedback control to bridge the impedance mismatch. However, these efforts have focused on a single metric that is manipulated by a single control and hence have not considered interactions between controls such as those that are common in computing systems. This paper shows how multiple-input, multiple-output (MIMO) control theory can be used to enforce policies for interrelated metrics. MIMO is used both to model the target system, Apache in our case, and to design feedback controllers. The MIMO model captures the interactions between KA and MC, and can be used to identify infeasible metric policies. In addition, MIMO control techniques can provide considerable benefit in handling trade-offs between speed of metric convergence and sensitivity to random fluctuations while enforcing the desired policies.
Nazim Agoulmine - One of the best experts on this subject based on the ideXlab platform.
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Practical and analytical approaches for designing scalable on-demand Policy-Based resource allocation in stateless IP networks
International Journal of Network Management, 2012Co-Authors: Kamel Haddadou, Samir Ghamri Doudane, Yacine Ghamri-doudane, Nazim AgoulmineAbstract:Today the Policy-Based Management (PBM) approach is recognized as an efficient solution to simplify the complex task of managing and controlling networks. To this end, the Internet Engineering Task Force (IETF) has introduced a reference framework to build PBM systems. However, this framework only addresses the provisioning of relatively long validity period services based on predefined service-level agreements. Furthermore, very little work addresses the scalability properties of the instantiation of this framework in a real network. This work aims to extend the IETF PBM framework in order to support dynamic provisioning of short-term services (end-system signalling) as well as an instantiation scheme that is scalable (distributed provisioning of edge routers). This instantiation scheme is based on the distribution of the provisioning process while keeping centralized only the parts that involve critical resources, namely bandwidth brokerage. The performance properties of the proposed scheme are then demonstrated throughout both extensive experimentation and an analytical study. The extension of this performance analysis to the case where multiple bandwidth brokers are used is also discussed. The results of this work are intended to be used as a guideline to help network operators to design a scalable PBM system in order to offer to their customers services with quality of service assurance on an on-demand basis.
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Designing Scalable on Demand Policy-Based Resource Allocation in IP Networks
IEEE Communications Magazine, 2006Co-Authors: Kamel Haddadou, Samir Ghamri Doudane, Yacine Ghamri-doudane, Nazim AgoulmineAbstract:Today, the Policy-Based Management approach is recognized as an efficient solution to simplify the complex task of managing and controlling networks. To this end, the IETF has introduced a reference framework to build PBM systems. However, this framework only addresses the provisioning of relatively long validity period services based on pre-defined service level agreements. Furthermore, very little work addresses the scalability properties of the instantiation of this framework in a real network. This work aims to extend the IETF PBM framework in order to support dynamic provisioning of short term services (end system signaling) as well as an instantiation scheme that is scalable (distributed provisioning of edge routers). This instantiation scheme is based on the distribution of the provisioning process while keeping centralized only the parts that involve critical resources, that is, the bandwidth brokerage. The performance properties of the proposed scheme are then demonstrated throughout both extensive experimentation and a short analytical study. The results of this work are intended to be used as a guideline to help network operators to design scalable PBM system in order to offer to their customers services with QoS assurance in an on-demand basis.
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On Scalability of Dynamic Resource Allocation in Policy enabled Networks: Practical and Analytical Evaluations
2005Co-Authors: Kamel Haddadou, Samir Ghamri Doudane, Yacine Ghamri-doudane, Nazim AgoulmineAbstract:In this paper we present a complete analysis of dynamic resource allocation in policy-enabled networks. This analysis is carried out throughout both practical and analytical evaluations. Firstly, we present the details of our dynamic resource allocation architecture based on the Policy-Based Management framework. Then, we evaluate, through extensive experimentations on a developed test-bed, the scalability of such architecture in a real environment. Finally, we develop an analytical model for the proposed architecture. This analytical evaluation allows us to confirm our practical analysis and to identify the weakness of such architectures.
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Toward feasibility and scalability of session initiation and dynamic QoS provisioning in policy-enabled networks
2005Co-Authors: Kamel Haddadou, Yacine Ghamri-doudane, Marc Girod-genet, Ahmed Meddahi, Laurent Bernard, Gilles Vanwormhoudt, Hossam Afifi, Nazim AgoulmineAbstract:In this paper we implement and evaluate a new solution for the multimedia session setup with resource allocation in policy-enabled networks that we developed in [1]. Our proposal is based on the use of Session Initiation Protocol (SIP) in the framework of Policy-Based Management (PBM)1. We specifically evaluate the feasibility and the scalability of such solution in a real environment through experimentation on a test-bed. The latter integrates all the components from session initiation to QoS policy enforcement into network elements. Our results demonstrate both of the relevance and the efficiency of such solution
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Une nouvelle architecture de gestion de réseaux DiffServ basée sur la technologie de réseau actif et la gestion à base de règles
Annales des Télécommunications, 2004Co-Authors: Mauro Fonseca, Nazim Agoulmine, Yacine Ghamri-doudane, Nadjib Achir, Guy PujolleAbstract:L’objectif de ce travail est de proposer une solution architecturale pour le problème complexe qu’est la gestion d’un réseau DiffServ. En effet, alors que DiffServ constitue une solution efficace pour offrir de la Qualité de service, son déploiement est difficile à mettre en œuvre à cause des nombreuses configurations à réaliser et à surveiller dans l’environnement fortement distribué et hétérogène qu’est le réseau d’un opérateur. La solution que nous proposons consiste à combiner l’approche réseau actif ( ra ) et la gestion de réseau par règles ( pbm ) pour profiter d’une part de la flexibilité et la mise à l’échelle qu’offre la technologie ra pour la gestion distribuée et d’autre part, du potentiel offert par l’approche pbm dans l’automatisation de la distribution de ces tâches de gestion dans le réseau opérateur. Notre approche constitue une alternative par rapport aux approches client/serveur généralement proposées. The objective of this work is to propose an architectural solution to the very complex problem of DiffServ network Management and control. Despite the fact that DiffServ offers a scalable QoS provisioning solution, it introduces a high complexity in term of its deployment due to the number of complex configurations to perform in the highly distributed and heterogeneous network environment. The proposed solution aims to take benefit from the scalability and flexibility properties of Active Network technology for distributing the control in large scale as well as the autonomic property of Policy Based Management to automate the distribution of these tasks in the operator network. This solution constitutes an alternative to the client/server approach generally used.
