By Jean-Philippe Vasseur M.S. in Computer Science, Mario Pickavet, Piet Demeester
Community restoration is the 1st publication to supply precise info on preserving and restoring communique networks, and it units a sky-high common for any which may persist with. within, you are going to examine particular options that paintings at each one layer of the networking hierarchy-including optical, SONET-SDH, IP, and MPLS-as good as multi-layer escalation ideas that supply the top point of safety. The authors start with an incisive creation to the problems that outline the sphere of community safety and recovery, and because the booklet progresses they clarify every thing you want to find out about the appropriate protocols, supplying theoretical analyses anyplace acceptable. in the event you paintings for a network-dependent association, huge or small, you need to preserve community restoration nearby continuously. * indicates you the way to enforce safeguard and restoration ideas that may shop your company time and money.* records suggestions for the optical, SONET-SDH, IP, and MPLS layers, in addition to multi-layer escalation strategies.* indicates you ways to judge those suggestions when it comes to each other, so that you can improve an optimum community restoration design.* offers examples and simulation results.* Delves into the internal workings of appropriate protocols and provides theoretical analyses anyplace this knowledge contributes in your sensible wisdom.
Read or Download Network Recovery : Protection and Restoration of Optical, SONET-SDH, IP, and MPLS (The Morgan Kaufmann Series in Networking) PDF
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Additional resources for Network Recovery : Protection and Restoration of Optical, SONET-SDH, IP, and MPLS (The Morgan Kaufmann Series in Networking)
Example text
In contrast to the recovery cycle—which is typically reacting to an unforeseen event, the failure—the reversion cycle can be planned well in advance. In a reversion, there is no need for a hasty operation; a well-controlled switch-back mechanism with minimal disruption is typically preferred. 5, a wide variety of recovery mechanisms exist, depending on the facilities of the network technology, the priorities and desires of the typical users of the network, and so on. Every recovery mechanism has its strengths and weaknesses.
Another method consists of selecting the working path unless a signal defect is detected. Then, the RTE starts to select the traffic from the recovery path. Note that this protection strategy is very efficient in terms of recovery time but quite expensive in terms of bandwidth usage. 3 It must be noted that this does not exclude all signaling after a failure. Various other kinds of signaling may take place between RHE and RTE, for fault notification, to synchronize their use of the protecting path, for reversion, and so on [Man2].
This is permitted because the probability of having a simultaneous malfunction on the working paths A-B-C and G-H-I is low, so usually at most one recovery path will be exploiting the resources on D-E-F at a time. , not used for the recovery of another working path). On the other hand, the backup capacity can be used much more efficiently in the case of shared backup capacity, because of its flexible character. The purpose of the backup resources is adapted to the failure that occurs. 2 Recovery Paths: Preplanned versus Dynamic Another choice depends on the moment the path for the recovery flow is chosen.