The receiver sending a reservation request can request a confirmation message.
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A successful reservation request propagates upstream along the multicast tree until it reaches a point where an existing reservation is equal or greater than that being requested.
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At that point, the arriving request is merged with the reservation in place and the node may then send a reservation confirmation message back to the receiver.
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Note that the receipt of a confirmation is only a high-probability indication, not a guarantee, that the requested service is in place. This uncertainity results from possible security policies.
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