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By A. Schuster, J. Nicholson

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After that, the protocol may decide to wait for a certain time before starting the notification of the repaired fault. This hold-off time may be needed to ensure that the path is stable. Indeed, in the case of an intermittent fault, a quick reaction of the reversion process may lead to unstable network conditions. As in the previous case, note that this timer may be a static or a dynamic value (dampening). 15 Reversion cycle. (V. Sharma, F. Hellstrand, ‘‘Framework for MPLS-based recovery,’’ Internet draft, work in progress, RFC 3469, February 2003.

Extra traffic can be transported over the M recovery entities when available. 4 Global versus Local Recovery To bypass the failed network facilities, recovery schemes change the route of affected traffic. We define the recovery extent as the portion of the working path that may be manipulated by the recovery scheme, that is, the recovered segment. In local recovery, only the affected network elements are bypassed. 19). If a single link fails, a (link-disjoint) recovery path is set up between the nodes adjacent to the failure.

1), the restricted routing pattern does not only hold for working paths. The recovery of traffic is also carried out on a ring-by-ring basis. If a failure occurs along a ring, the traffic is rerouted along the other side of the ring. 21 shows an example in which two simultaneous faults (in different rings) lead to recovery actions in both affected rings. To avoid single points of failure, special recovery measures must be taken for the interconnection of the rings. Chapters 2 and 3 further elaborate on recovery techniques in SONET/SDH and OTN ring networks, respectively.

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An Introduction to the Theory of Optics by A. Schuster, J. Nicholson

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