Estudo comparativo de tÃcnicas de restauraÃÃo de caminhos em redes de serviÃos

AUTOR(ES)

Klarissa de Souza JerÃnimo

DATA DE PUBLICAÇÃO

2005

RESUMO

The point-to-point communication (link) in a network such as the Internet may fail. Restoration techniques can be used to preserve this communication, from other links, making new paths. This restoration represents a cost increase related to the original path. In an overlay service network, there are many distributed services among the nodes. To do a task, which is composed by a sequence of services, the path which connects source to destination nodes is composed by a sequence of links and the nodes which contain the services in order what the application needs. It was used service network restoration techniques, due to the network technique restriction of not considering the possibility of using other paths which are capable of doing the same task, having the same services of the original path nodes in a failure occurrence. One of the contributions of this dissertation is an analysis of three techniques of service network restoration (network, local and total). Network technique is not new and it reconnects the same nodes whose links did not fail. The two last techniques are based on a map of services and the nodes from the original network. Local technique considers restoration from a point of failure and the total technique finds a new path of restoration since all services that the application needs, even including parts from the original path. The total technique was better than the network technique in two aspects: it increased the path cost in 10% versus 20-50% which the network technique offered; it depended on the number of nodes and it did not increase restoration cost with the increasing number of network nodes. Therefore, total technique is encouraged to use in big networks. In the other hand, network technique is indicated to restore short duration applications or for those whose bottleneck is not in network communication

ASSUNTO(S)

paths restoration restauraÃÃo de caminhos service networks redes overlay ciencia da computacao redes de serviÃos overlay networks

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