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A3 RSVP Nomenclature and Mechanisms
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Some of the RSVP nomenclature follows (see Table 3-8) Flow is the term used in RSVP, MPoA, MPLS, switching routers, and so on to describe a sequence of PDUs with the same QoS requirements Typically, flows are segregated by the IP destination address and port number A session designates flows with a particular destination IP address and port; in this manner, a session can be identified and provided with special QoS treatment RSVP utilizes two terms to describe traffic categories: a Flowspec, which is the information contained in the reservation request pertaining to QoS requirements for the reservation in question, and the Filterspec, which specifies the flows received or scheduled by the host The following list provides some highlights of the protocol:
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Supports the capability for entities to signal their desired QoS Not a routing protocol Assumes the prior existence of network-layer routing support via the protocols Interior Gateway Routing Protocol (IGRP), BGP, and so on Requests for state information, but does not help provide it Soft, not hard state Not an admission-control or packet-scheduling application Receiver-oriented protocol receivers send QoS requests upstream toward senders; this works particularly well in multicast environments (that is, a receiver can best determine the acceptable quality of a videoconference and/or if additional costs are justified) Supports two reservation styles for use in multisender sessions
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Distinct reservations Separate reservations for each sender Shared reservations Shared by multiple senders
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Applications have the capability to request different reservation styles depending upon the ToS or economic considerations
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RSVP work started in 1991 at Lawrence Berkeley National Laboratories and Xerox s Palo Alto Research Center in support of first-generation Internet-based multimedia tools Desiderata were efficient use of Internet resources, scalability, support of unicast and multicast, and coexistence with TCP/IP There are three components used by end systems (hosts) to determine and signal QoS The components are
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The setup protocol used by routers or hosts to signal QoS into the network
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Quality of Service (QoS)
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Table 3-8 RSVP Nomenclature
Advertised specification (Adspec) Filterspec
A set of modifiable parameters used to describe the QoS capability of the path between the source and destination The set of PDUs (packets) that receive the QoS specified by the Flowspec The session ID, an implicit part of the filter, segregates and schedules output packet streams in the packet classifier according to their source address|port A description of the desired QoS reservation The Flowspec in a reservation request contains the service class and two sets of numeric parameters: Tspec and Rspec If the request is successful, the Flowspec sets the packet scheduler Unique header pattern occurring in packet classification A way to characterize the desired QoS The characterization of resources reserved to satisfy receivers in terms of what QoS characteristics the packet stream will use; this information evaluates QoS requests The sender s IP address (and, optionally, port number) Specific parameters that describe a reservation including unique information used to differentiate the traffic flow associated with the session A session is identified by the combination destination address|protocol|port
Flow specification (Flowspec)
Packet filter Resource specification (Rspec)
Sender template Session
Transmission specification (Tspec)
A traffic model or specification (the Flowspec) that defines the traffic and QoS characteristics flow data leaving a source Traffic controls (shaping mechanisms) that measure traffic flows leaving a host or router to ensure that it does not exceed the agreedupon QoS
RSVP uses IP as the basic method of carrying the signaling messages; this facilitates broad application since, for example, an ISP s networks are IP-based However, RSVP produces a simplex reservation that is, the end stations are only specifying resource reservations for one direction at a time; hence, two reservation requests are needed if bidirectional QoS is desired As noted, if an RSVP reservation is successful, there is no acknowledgment from the network, as would be the case with an ATM call request for a switched virtual circuit (SVC) This design decision was made to keep the protocol simple, but could pose problems when interworking with other
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