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Resource Reservation Protocol (RSVP) is a transport layer protocol used to reserve network resources and enable running Internet applications to gain quality of service (QoS). Some old networks were required to provide reliability of data. However, in today's era of network systems, time is often more important than reliability. Instead, RSVP is supported by a QoS network, providing both the quality of service and insured data.
RSVP is used for data flow and provides QoS to all its network agents/devices. By using RSVP, a client may request quality of service from a network for data flow. Network devices like routers us RSVP to provide information to all the nodes on a network. As RSVP is not a routing protocol, it gains the data path and routing information from neighboring routers. Applications on a network send requests for QoS. Then routers on the network provide the requested information. RSVP keeps all the records of information being exchanged. RSVP is also used to maintain and transport traffic and policy control issues.