The Resource Reservation Protocol (RSVP) is a network-control protocol that enables Internet applications to obtain special qualities of service (QoSs) for their data flows. RSVP is not a routing protocol; instead, it works in conjunction with routing protocols and installs the equivalent of dynamic access lists along the routes that routing protocols calculate. RSVP occupies the place of a transport protocol in the OSI model seven-layer protocol stack. RSVP originally was conceived by researchers at the University of Southern California (USC) Information Sciences Institute (ISI) and Xerox Palo Alto Research Center. The Internet Engineering Task Force (IETF) is now working toward standardization through an RSVP working group. RSVP operational topics discussed in this chapter include data flows, quality of service, session startup, reservation style, and soft state implementation.
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