Figure 8-12 Successful reservation for a single sender and a single receiver in .NET framework

Encode Data Matrix 2d barcode in .NET framework Figure 8-12 Successful reservation for a single sender and a single receiver

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Figure 8-12 Successful reservation for a single sender and a single receiver
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PATH { Session RSVP_Hop Time_Values Sender_template Sender_TSpec ADSpec (possibly modified) }
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c RESV { Session RSVP_Hop Time_Values RESV_Confirm (optional) Style Flow descriptor list }
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d RESV { Session RSVP_Hop Time_Values RESV_Confirm (optional) Style Flow descriptor list } e ResvConf { Session Error_Spec RESV_Confirm Style Flow descriptor list }
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ResvConf { Session Error_Spec RESV_Confirm Style Flow descriptor list }
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Quality of Service (QoS)
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Sender Receiver 1 Router Cloud a b PATH { Session RSVP_Hop Time_Values Sender_template Sender_TSpec ADSpec (Optional) }
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Receiver 2
Figure 8-13 Successful reservation for a single sender and two receivers
PATH { Session RSVP_Hop Time_Values Sender_template Sender_TSpec ADSpec (possibly modified) }
c PATH { Session RSVP_Hop Time_Values Sender_template Sender_TSpec ADSpec (possibly modified) } d e RESV { Session RSVP_Hop Time_Values Style Flow descriptor list } f RESV { Session RSVP_Hop Time_Values RESV_Confirm (optional) Style Flow descriptor list } g ResvConf { Session Error_Spec RESV_Confirm Style Flow descriptor list } RESV { Session RSVP_Hop Time_Values Style Flow descriptor list }
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Quality of Service (QoS)
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network from the sender to receiver The network nodes do not modify the sender template and TSpec, but they can modify the ADSpec The receiver responds with an RESV message, which can optionally contain a request that the reservation be confirmed The RESV message indicates the style of reservation to be applied and a list of flow descriptors Each such descriptor is a flowspec and/or filter spec, depending on the reservation style in question In Figure 8-12, the receiver has requested confirmation of the success of the reservation Consequently, a ResvConf message is returned The Error_Spec contains an error code of 0 in the case of a successful reservation The Resv_Confirm object is copied from the RESV message The style and flow descriptor indicate the particular reservations that are being confirmed The information in these elements might not be identical to the corresponding information on the RESV message, because in the case of multiple senders, the reservation might not be successful for data streams from all the senders In the multicast example of Figure 8-13, Receiver 1 sends an RESV message just before Receiver 2 In this example, the QoS requirement of Receiver 1 is stronger than that of Receiver 2 In that case, there is no need to modify the reservation already sent back towards the receiver, because the reservation from Receiver 1 is good enough to support the requirements of both receivers In the example, Receiver 2 requested a confirmation, but Receiver 1 did not Note that the confirmation is sent from the router at which the reservations merge This procedure is used when a router receives an RESV message with a request for confirmation and a reservation is already in place that meets or exceeds the requirements of the reservation to be confirmed In certain cases, this situation can lead to a false confirmation, particularly if the existing reservation request fails at some point closer to the sender Therefore, a reservation confirmation should only be considered an indication of high probability that a reservation has succeeded
Reservation Errors
Of course, a given resource reservation could fail, in which case an error message is returned Two error message exist: PathErr and ResvErr PathErr messages are simply passed back to the sender whose PATH message led to the error ResvErr messages are sent to a receiver when a given reservation request fails With merged flowspecs, it is important that a reservation
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Quality of Service (QoS)
Quality of Service (QoS)
request that fails for a given reason does not deny service for a different request that would have succeeded on its own For example, imagine two receivers who both send reservation requests and those requests meet at a single router that resides in the path from the sender to receivers If one receiver s request fails at the router due to an excessive bandwidth request, the other receiver s request should not fail if it has requested a smaller bandwidth that could be supported
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