Adspec: a Path message may optionally carry a package of OPWA advertising information.
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An Adspec received in a Path message is passed to the local traffic control, which returns it updated
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The updated version is then forwarded in Path messages sent downstream.
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Sender Tspec is never changed, Adspec may be changed by intermediate nodes
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Adspec includes both parameters describing the properties of the data path (availability of specific QoS services) and parameters required by specific QoS control services to operate correctly.
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Adspec is finally passed to the application via RSVP API.
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