Summary
The Resource Reservation Protocol (RSVP) is a transport layer protocol designed to reserve resources across a network using the integrated services model. RSVP operates over an IPv4 or IPv6 and provides receiver-initiated setup of resource reservations for multicast or unicast data flows. It does not transport application data but is similar to a control protocol, like Internet Control Message Protocol (ICMP) or Internet Group Management Protocol (IGMP). RSVP is described in . RSVP can be used by hosts and routers to request or deliver specific levels of quality of service (QoS) for application data streams. RSVP defines how applications place reservations and how they can relinquish the reserved resources once no longer required. RSVP operations will generally result in resources being reserved in each node along a path. RSVP is not a routing protocol but was designed to interoperate with current and future routing protocols. RSVP by itself is rarely deployed in telecommunications networks. In 2003, development effort was shifted from RSVP to RSVP-TE for teletraffic engineering. Next Steps in Signaling (NSIS) was a proposed replacement for RSVP. RSVP requests resources for simplex flows: a traffic stream in only one direction from sender to one or more receivers. RSVP is not a routing protocol but works with current and future routing protocols. RSVP is receiver oriented in that the receiver of a data flow initiates and maintains the resource reservation for that flow. RSVP maintains soft state (the reservation at each node needs a periodic refresh) of the host and routers' resource reservations, hence supporting dynamic automatic adaptation to network changes. RSVP provides several reservation styles (a set of reservation options) and allows for future styles to be added in protocol revisions to fit varied applications. RSVP transports and maintains traffic and policy control parameters that are opaque to RSVP. The basic concepts of RSVP were originally proposed in 1993.
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