JOB RESERVATION AND SERVICE IN INTESERV AND RSVP in .NET

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61 JOB RESERVATION AND SERVICE IN INTESERV AND RSVP
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Routers are the primary service resources on the end-to-end path of a continuous ow job or an instantaneous job traversing on the Internet from the source end to the destination end Routers provide the data routing and transmission service to the job The end-to-end delay of a given job is the sum of its service times at the routers on its end-to-end path The service time of the job at each router is made up of the waiting time and the data transmission time How long the job waits in the internal buffer of the router before its turn to be transmitted
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Secure Computer and Network Systems: Modeling, Analysis and Design Nong Ye C 2008 John Wiley & Sons, Ltd
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Job reservation and service protocols
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out depends on how many jobs arrive and are scheduled ahead of this job to receive the data transmission service Since the generation of jobs and their arrival at the router competing for the router s bandwidth are not predictable, the waiting time of a given job at the router depends on the dynamic arrival of other jobs at the router Hence, there is no guarantee of a given job s waiting time and thus its service time at the router, unless the job makes a reservation for the desired amount of the router s bandwidth resource to be available at the time of arrival Without a resource reservation, the router cannot guarantee the timely service of any job due to the dynamic arrival of many jobs which are all competing for the router s bandwidth resource As discussed in 4, InteServ and RSVP [1 2] meet the end-to-end delay and jitter requirements of a continuous ow job by reserving a given amount of bandwidth at each router on the end-to-end path to satisfy the data ow rate of the job for the entire session of the continuous ow job Although the ow rate is a main characteristic of a continuous ow job and is guaranteed through the bandwidth reservation, the ow rate of a continuous ow job often does not stay constant at the level of the reserved bandwidth but instead uctuates over time Consequently, traf c policing and shaping mechanisms, such as the token bucket model of admission control described in 4, are required to make the ow rate of admitted traf c to a given router comply with the reserved bandwidth for a continuous ow job Since there usually are a number of reserved continuous ow jobs to serve by a given router at the same time, a sophisticated job scheduling method is also required to determine at a given time which queue of a reserved job to take data from for the data transmission service, and how much data should be taken Hence, InteServ and RSVP rely on the bandwidth reservation and reservation-complying functions to satisfy the ow rate and consequently meet the end-to-end delay and jitter requirements of a continuous ow job
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62 JOB RESERVATION AND SERVICE IN I-RSVP
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As for a continuous ow job in InteServ and RSVP, the end-to-end delay for an instantaneous job cannot be guaranteed without a resource reservation because the dynamic generation and arrival of jobs at routers on the Internet which are competing for service from routers are not predictable Note that only jobs of high priority are considered when making a job reservation Hence, jobs in the following text refer to jobs of high priority Unlike a continuous ow job which is characterized by its ow rate for the entire session of the continuous ow job, an instantaneous job is characterized by its job size which is known when the job is created For example, an email carrying a message from the source node is characterized by its job size which can be measured by the data amount of the message The email may have an end-to-end delay requirement for reaching, from its source node to the end of its destination node within a given time For a given router, a given instantaneous job is characterized by its job size as well as its arrival time To guarantee the availability of the router s bandwidth for the job, the bandwidth reservation at the router for the instantaneous job can be made by reserving a speci c time slot that is available after the arrival of the job and is large enough to accommodate the size of the job During the reserved service time slot, the router serves the job by transmitting its data Therefore, for a continuous ow job, InteServ and RSVP reserve the bandwidth at each router on the end-to-end path of the job, according to the required ow rate of the continuous ow job For an instantaneous job, I-RSVP reserves the job s service time slot at each router on the end-to-end path of the job according to the job size and the arrival time of the job In the description of I-RSVP below, the time of a job or a data packet traveling through a network
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