by Charcranoon, Saravut; El-Bawab, Tarek S.; Shin, Jong-Dug; Cankaya, Hakki C.

The problem of operation and maintenance (OAM) in optical burst switched (OBS) networks is not addressed by the optical-networking community even though OBS has been gaining research interest in recent years. In this paper, we introduce a functional model of OBS networks and an OAM architecture that is designed to meet the operational requirements based on this model. We present the first framework to realize OAM in OBS networks, including OAM activities, OAM-aware OBS nodes, OAM information and communication models and protocols. A number of practical examples of possible network failures and the corresponding reactions are presented.

DOI: 10.1007/s10922-005-9002-9
Online Date: 12/16/2005
Print publication date: 12/1/2005
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by Ding, Jianguo; Krämer, Bernd; Bai, Yingcai; Chen, Hansheng

The growing complexity of distributed systems in terms of hardware components, operating system, communication and application software and the huge amount of dependencies among them have caused an increase in demand for distributed management systems. An efficient distributed management system needs to work effectively even in face of incomplete management information, uncertain situations, and dynamic changes. In this paper, Bayesian networks are proposed to model dependencies between managed objects in distributed systems. The strongest dependency route (SDR) algorithm is developed for backward inference in Bayesian networks. The SDR algorithm can track the strongest causes and trace the strongest routes between particular effects and its causes, the strongest dependency of causes can be also achieved by the algorithm. Thus, the backward inference provides an efficient mechanism in fault locating, and is beneficial for performance management.

DOI: 10.1007/s10922-005-9003-8
Online Date: 12/10/2005
Print publication date: 12/1/2005
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by Clemm, Alexander; Festor, Olivier; Pras, Aiko

DOI: 10.1007/s10922-005-9006-5
Online Date: 12/2/2005
Print publication date: 12/1/2005
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