RSVP reservation request messages originate at receivers and are passed upstream towards the sender. At each intermediate node, two general actions are taken:
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Make a reservation
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The request is passed to admission control and policy control.
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If either test fails, the reservation is rejected and RSVP returns an error message to the appropriate receiver.
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If both succeed, the node uses the flowspec to set up the packet scheduler for the desired QoS and the filter spec to set the packet classifier to select the appropriate data packets.
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