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If this revertive mode is provided, this can lead to more efficient network utilization than leaving the traffic along the recovery path. On the other hand, the nonrevertive mode avoids the temporary repercussions of a switch-back operation. 6 Multilayer Recovery In the previous sections, the main characteristics of recovery schemes active in one network layer (technology) were presented. These schemes prove very effective to cover a number of failure scenarios. In a realistic (multilayer) network, one could imagine a situation in which every network layer has its own recovery mechanism.

Therefore, a practical strategy followed by most operators and service providers is to identify the most frequently occurring failures, to classify these failures in a limited set of failure scenarios, and to provide ‘‘healing’’ measures to overcome these failures in a gracious, costeffective manner. These failures are called accounted failures in the remainder of this book, although no measures are provided for unaccounted failures. 4, but for now we concentrate on the definition of the accounted failure scenarios.

2 The focus on the single-link or single-node failure scenario is based on two main assumptions: . In most cases, the failure of a link or node in the network is statistically independent of the failure of another link or node in the network (assuming that dramatic outages affecting large parts of the network, such as earthquakes, are very unlikely). If the network scale is not too large, the MTTR for a single-link or singlenode failure is typically much shorter than the MTBF. Hence, the probability that two (link or node) faults are overlapping in time can be neglected in comparison to the probability of a single-link or single-node fault.

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