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RSVP Protocol
The Resource ReSerVation Protocol (RSVP) enables network devices to reserve resources across an IP network, supporting applications that require guaranteed or differentiated levels of service such as latency-sensitive audio and video streams..
The Resource ReSerVation Protocol (RSVP) operates as a signaling protocol designed to reserve resources across a network by establishing a specific Quality of Service (QoS) for data flows. RSVP runs over both TCP and UDP, using port 3455 to communicate reservation requests between network endpoints and intermediate routers.
RSVP functions by sending PATH messages downstream from the source to the receiver, which then responds with RESV messages that travel upstream, detailing bandwidth and service parameters required. Nodes in the network process these messages, allocate necessary resources like buffer space or bandwidth, and maintain soft state entries refreshed periodically.
RSVP is integral to frameworks such as Integrated Services (IntServ), where it provides fine-grained bandwidth guarantees. It helps manage the performance of real-time interactive services like VoIP or video conferencing by facilitating reliable resource allocation across IP networks prone to congestion and variable latency.