Protection is to assign dedicated path or node or board to be used in case of main resource fail.
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Restoration is to try switch to any other avilable path to protect the service.
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In 100G Links and more , we have to implement restoration with protection.
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Restoration allow to Improve the WDM Links reliability and availability.
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We can say restoration allow protection against multiple faults.
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Restoration advantages is bandwidth and resources utilization.
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Restoration can be done in DWDM using GMPLS.
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Simply GMPLS has a set of protocols to check the faults and try to compute the network avilable paths and reroute the traffic from failed path to a other path.
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Disadvantage of restoration is that we can’t guarantee the switching time or recovery time.
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But in protection we can achieve a maximum 50 msec switching time.
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