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RSVP Messages
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Two basic RSVP message types: Resv and Path.
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Each receiver host sends RSVP reservation request (Resv) messages upstream towards the senders.
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Resv messages must follow exactly the reverse of the routes the data packets will use, upstream to all the sender hosts included in the sender selection.
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Resv messages are delivered to the sender hosts themselves so that the hosts can set up appropriate traffic control parameters for the first hop.
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