W. Timothy Strayer, Bert Dempsey, and Alfred Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley Publishing Company, 1992.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....[5, 31, 39] requiring human intervention. However, they also argue the fault rates of these networks are very low. The LAN and WAN networking communities have recognized that byte stream abstraction is not always appropriate and so have proposed many alternative messaging based protocols, e.g. [28, 33]. The key difference from the MPP and SAN networks is that like TCP, these protocols viewed packet loss as signaling congestion. There has been extensive work in analysing faults and how they impact systems [13, 22, 34] However, the focus of these studies was not on the communication system. ....

W. Strayer, B. Dempsey, and A. Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley, 1992.

....[5, 31, 39] requiring human intervention. However, they also argue the fault rates of these networks are very low. The LAN and WAN networking communities have recognized that byte stream abstraction is not always appropriate and so have proposed many alternative messaging based protocols, e.g. [28, 33]. The key difference from the MPP and SAN networks is that like TCP, these protocols viewed packet loss as signaling congestion. There has been extensive work in analysing faults and how they impact systems [13, 22, 34] However, the focus of these studies was not on the communication system. ....

W. Strayer, B. Dempsey, and A. Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley, 1992.

....intervention. However, they also argue the fault rates of these networks are very low. The LAN and WAN networking communities have recognized that byte stream abstraction is not always appropriate and so have proposed many alternative messaging based protocols. A few of the originals include [12, 36, 40]. The key difference from the MPP and SAN networks models is that these protocols, like TCP, viewed packet loss to signal congestion. There has been extensive work in analysing faults and how they impact systems [17, 41, 28] However, the focus of these studies was not on the communication ....

W. Strayer, B. Dempsey, and A. Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley, 1992.

....describes a technique to recover from lost messages. It is legitimate to ask why BFT does not use an existing reliable communication protocol. There are many protocols in the literature to implement reliable point to point (e.g. TCP [Pos81] and multicast communication channels (e.g. XTP [SDW92] These protocols ensure that messages sent between correct processes are eventually delivered but they are ill suited for algorithms that tolerate 64 faults in asynchronous systems. The problem is that any reliable channel implementation requires messages to be buffered until they are known to ....

W. Strayer, B. Dempsey, and A. Weaver. XTP: The Xpress Transfer Protocol. AddisonWesley, Reading, Massachusetts, 1992.

....used as a layer underneath the reliable multicast layer for the case of independent and homogeneous loss. Most other reliable multicast protocols use only ARQ to assure reliability. In order to achieve scalability and avoid feedback implosion these protocols use slotting and damping [FJL 96, SDW92] or introduce a hierarchy [LP96, Hof96, YGS95] Both solutions are not without disadvantages: ffl Slotting and damping requires a careful choice estimation of parameters. ffl Introducing a hierarchy poses the problem of selecting designated intermediate nodes that are required to have special ....

W.T. Strayer, B.J. Dempsey, A.G. Dempsey. XTP: The Xpress Transfer Protocol, Addison-Wesley, 1992.

....potential feedback increases linearly with the number of receivers and imposes high requirements to the mechanism for feedback implosion avoidance. Several solutions for implosion avoidance exist based on hierarchies [YGS95, PSLB97, Hof96, BP97, DO97] sampling [BTW94] tokens [JN93] and timers [SDW92, FJL 96, SEFJ97, Gro97] AMP uses a probabilistic feedback method based on timers that is shown to avoid feedback implosion for up to 10 receivers and is shown to be robust against loss and different delays between sender and receivers. In contrast to other feedback mechanisms does the one ....

Timothy W. Strayer, Bert J. Dempsey, and Alfred C. Weaver. XTP - THE XPRESS TRANSFER PROTOCOL. AddisonWesley, 1992.

....of FEC when used as a layer underneath the reliable multicast layer for the case of independent and homogeneous loss. Most other reliable multicast protocols use only ARQ to assure reliability. In order to achieve scalability and avoid feedback implosion these protocols use slotting and damping [5, 6] or introduce a hierarchy [7, 8, 9] Both approaches are not without disadvantages: ffl Slotting and damping requires a careful choice estimation of parameters. ffl Introducing a hierarchy poses the problem of selecting designated intermediate nodes that are required to have special ....

T. W. Strayer, B. J. Dempsey, and A. C. Weaver, XTP - THE XPRESS TRANSFER PROTOCOL, AddisonWesley, 1992.

....exist that provide a solution to the feedback implosion problem: ffl Hierarchical approaches [17, 18, 19, 20, 21] Are an inherent solution to the feedback implosion problem and ensure a limited number of FBMs by accumulation filtering in subgroups. ffl Approaches based on MAC protocols [22, 23, 3, 4]: The feedback problem in multicast communication is related to the problem of Medium Access Control [24] The multicast channel constitutes the shared medium and messages sent on the multicast channel are seen by every connected group member. A token mechanism as in token ring is proposed in [22] ....

....Medium Access Control [24] The multicast channel constitutes the shared medium and messages sent on the multicast channel are seen by every connected group member. A token mechanism as in token ring is proposed in [22] and random timers with exponential back off as in CSMA CD [25] are used in XTP [23] or the SRM protocol [3, 4] Both classes of solutions are not without disadvantages: Hierarchical approaches require the setup of the hierarchy of subgroups and can not be employed in a scenario like satellite distribution with unicast backward channels. Approaches based on MAC protocols suffer ....

Timothy W. Strayer, Bert J. Dempsey, and Alfred C. Weaver, XTP - THE XPRESS TRANSFER PROTOCOL, Addison-Wesley, 1992.

....1. The sequence number is a cumulative acknowledgment (CumACK) that specifies the sequence number of the highest in order data packet received. The bit vector is a succinct way to specify negative acknowledgments (NACKs) and is taken from prior well known selective repeat protocols (e.g. XTP [26]) Starting with the sequence number specified in the CumACK, the bit vector notifies the sender about the successful or unsuccessful reception of up to W Gamma 1 additional data packets. A 0 in the vector indicates that a packet with the corresponding sequence number has not been received ....

W.T. Strayer, B.J. Dempsey, and A.C. Weaver. XTP The Xpress Transfer Protocol. Addison-Wesley, 1st edition, 1992.

....Currently TCP is used by virtually all unicast based Internet applications that desire reliability at the transport level (e.g. the world wide web, file transfer, or e mail) For multicast the usage of reliable transport protocols is less uniform. There exist diverse reliable multicast protocols [51,90] that seek to provide services similar to TCP for multicast transmissions. This diversity exists because the best way to achieve reliability for multicast depends heavily on the application. The diversity in the following application characteristics may cause distinct reliable multicast protocol ....

W. T. Strayer, B. J. Dempsey and A. C. Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley, Reading, Massachusetts, 1992.

....acknowledgment (ACK) to the sender in order to indicate successful reception of the data packet. If the sender misses an ACK packet from one or more receivers, a multicast retransmission is sent to the whole group. An example for a sender initiated protocol is the Xpress Transport Protocol (XTP) [3]. In contrast to senderinitiated protocols, receiver initiated protocols return only negative acknowledgments (NAKs) instead of ACKs. As in the sender initiated protocol class, we assume that retransmissions are sent using multicast. In protocols of class (N1) a receiver sends a unicast NAK to ....

T. W. Strayer, B. J. Dempsey, and A. C. Weaver, XTP -- The Xpress transfer protocol, Addison-Wesley Publishing Company, 1992.

....of XTP when implemented in the user level. 4.2. 1 Performance of the checksum algorithm The speed of checksum calculation is known to be one of the important factors that determine the performance of a transport protocol [22] 34] The XTP designers proposed to perform this task in hardware [35]. The following results 10 W. Dabbous show that it is possible to optimize the software implementation of this routine thus removing of the bottlenecks for the protocol performance. The performance of TCP and ISO TP4 checksum algorithms are given in the first two rows of the table 4 for four ....

W. Timothy Strayer, Bert J. Dempsey, Alfred C. Weaver, XTP: The Xpress Transfer Protocol, Addison-Wesley, 1992.

....1. The sequence number, which we call cumulative acknowledgment (CACK) specifies the highest sequence number of a data packet received in sequence. The bit vector is a succinct way to specify negative acknowledgments (NACKs) and is taken from prior well known selective repeat protocols (e.g. XTP [27]) Starting with the sequence number specified in the CACK, the bit vector notifies the sender about the successful or unsuccessful reception of up to W Gamma 1 additional data packets. The bit vector is represented as: B = fb 0 ; b 1 ; b n g where b i 2 8 : 0 if packet has ....

W.T. Strayer, B.J. Dempsey, and A.C. Weaver. XTP The Xpress Transfer Protocol. Addison-Wesley, 1st edition, 1992.

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W. Timothy Strayer, Bert Dempsey, and Alfred Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley Publishing Company, 1992.

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W. T. Strayer, B. Dempsey & A. Weaver 1992. XTP: The Xpress Transfer Protocol. Addison Wesley, New York.

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W. T. Strayer, B. Dempsey, and A. Weaver. XTP: The Xpress Transfer Protocol. Addison Wesley, 1992.

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Strayer T, Dempsey B, Weaver A (1992) XTP: The Xpress Transfer Protocol. Addison-Wesley, Reading, Mass.

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W. Timothy Strayer, Bert J. Dempsey, and Alfred C. Weaver. XTP: The Xpress Transfer Protocol. Addison-Wesley Publishing Co., Reading, MA, 1992.

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T. Strayer, B. Dempsey, and A. Weaver. XTP -- THE XPRESS TRANSFER PROTOCOL. Addison-Wesley Publishing Company, 1992.

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Strayer, T. W., Dempsey, B. J., and Weaver, A. C. (1992). XTP -- THE XPRESS TRANSFER PROTOCOL. Addison-Wesley Publishing Company, page 580 pages.

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T. Strayer, B. Dempsey, and A. Weaver. XTP -- THE XPRESS TRANSFER PROTOCOL. Addison-Wesley Publishing Company, 1992.

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W. Strayer, B. Dempsey, A. Weaver, XTP: The Xpress Transfer Protocol, Addison-Wesley, 1992.

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Strayer, W.T., Dempsey, B.J., and Weaver, A.C., "XTP: The Xpress Transfer Protocol", Addison-Wesley Publishing Company, Inc., 1992.

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Strayer, W., Dempsey, B., and A. Weaver, "XTP: The Xpress Transfer Protocol", Addison-Wesley Publishing Co., Reading, MA, 1992.

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W. T. Strayer, B. J. Dempsey and A. C. Weaver, XTP---The Xpress Transfer Protocol, Addison-Wesley, Reading, Mass., 1992.

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