RSVP defines a "session" as a data flow with a particular destination and transport-layer protocol.
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The destination of a session is generally defined by DestAddress, the IP destination address of the data packets, and possibly by DstPort, a "generalized destination port". RSVP treats each session independently.
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DestAddress is a group address for multicast delivery or the unicast address of a single receiver. DstPort could be defined by a UDP/TCP destination port field, by an equivalent field in another transport protocol, or by some application-specific information.
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