An elementary RSVP reservation request consists of a "flowspec" and a "filter spec"; this pair is called a "flow descriptor".
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The flowspec specifies a desired QoS. It is used to set parameters to the node's packet scheduler, assuming that admission control succeeds.
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The filter spec, together with a session specification, defines the set of data packets -- the "flow" -- to receive the QoS defined by the flowspec. Filter spec is used to set parameters in the packet classifier.
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