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Issues in Protocol Extensions under Consideration Performance improvement Provide a low blocking probability Provide reduced message exchange With a low latency of provisioning Independent of the precise wavelength availability information Assume that no precise wavelength availability information can be guaranteed or even available before signaling Inherit the idea of wavelength verification using Label set Small block of extension A new refined unit function as that for unidirectional lightpath provisioning Interact with other protocols as LITTLE as possible, for example, it may involve extensions in signaling only, or may also require extensions in other protocols outside the signaling If it is possible to resolve the problem within the signaling, it is required to involve objects as LITTLE as possible |