From: lynn@garlic.com   
      
   bits & pieces from (20yrs ago):   
      
   Transfer          		vol. 2 no. 5   
   Protocol Engine Information	September/October 1989   
      
   In this issue:   
      
   XTP Electronic Mail Group   
   XTP Multicast Group Management   
   X3S3.3 HSP Meeting   
   Thoughts on Fast Protocols   
   Use of the XTP Path Command   
   TAB Activity   
   On the Road with XTP1   
      
   ... snip ... and ...   
      
   XTP Multicast Group Management and Data Transfer   
       by Alfred C. Weaver, Bert J. Dempsey, W. Timothy Strayer   
      
   (editors note: this is the second installment on a five part series on   
   Multicast)   
      
   Group Management   
      
   In developing any multicasting facility one must first decide on the   
   nature of the multicast groups and how they will be created and   
   modified. In this section we look first at group attributes of   
   possible interest, then at the functionality of the group management   
   protocol, and finally at a classification of the ways to implement   
   group management.   
      
   ... snip ... and ...   
      
   To Probe Further ....   
      
   BIRM87 - Birman, Kenneth, and Josepth, T., "Reliable Communication in   
   the Presence of Failures", ACM Transactions on Computer Systems,   
   Volume 5, Number 1, pp 47-76, February 1987   
      
   CHER85a - Cheriton, D., and Deering S.E., "Host Groups" a Multicast   
   Extension for Datagram Interneworks", Proceedings of the Ninth Data   
   Communications Symposium, IEEE?ACM, Whistler Mountain, BC, Canada, pp.   
   172-179, Sept. 1985   
      
   CHER85b - Cheriton, D. and Zwaenepoel, W., "Distributed Process Groups   
   in the V Kernel", ACM Transactions on Computer System, Volume 3,   
   Number 2, pp. 77-107, May 1985   
      
   CHER89 - Cheriton, D. and Williamson, Carey L., "VMTP as the   
   Transport Layer for High-Performance Distributed Systems", IEEE   
   Communications Magazine, pp. 37-44, June 1989   
      
   GAIT89 - Gait, Jason, "A Kernel for High-Performance Multicast   
   Communications", IEEE Transactions on Computers, Volume 38, Number 2,   
   February 1989.   
      
   HUGH87 - Hughes, L., "An Introduction to Multicast Communications",   
   Proceedings of the Special Conference of the International Council for   
   Computer Communications, New Delhi, India, October 1987   
      
   PALI88 - Paliwoda, K., "Transactions Involving Multicast", Computer   
   Communication Review, Volume 11, Number 6, pp. 313-18, December 1988   
      
   ... snip ... and ...   
      
   Thoughts on Fast Protocols   
   	 by Alfred C. Weaver   
      
   Protocol speed is affected by its design philosophy, mechanical   
   definition, implementation, and the circumstances of its eventual use.   
   My comments are focused mainly on design philosophy. Since the   
   transport layer is the traditional provider of reliable   
   communications, these comments are therefore focused on that layer in   
   particular. Let's examine some common design philosophies.   
      
   ... snip ... and ...   
      
   (2) A connection must exist before data can be reliably transferred.   
      
   The ISO TP4 philosophy is a six-way handshake: connection request,   
   connect confirm, data transfer, acknowledgment, disconnect request,   
   and disconnect confirm. The Xpress Transfer Protocol (XTP) has shown   
   that data can be reliably exchanged with a three-way handshake: one to   
   establish the context and transfer the data, one to acknowledge the   
   context and data, and one to terminate the context. There is little   
   harm in allowing data to accompany the connection request. If the   
   connection is accepted then data transfer has already begun; if   
   refused, the loss is just the investment in transmitting one frame.   
      
   ... snip ...   
      
   the above multicast article reference has mention of VMTP which has   
   IETF RFC1045.   
      
   for some more drift ... my rfc index   
   http://www.garlic.com/~lynn/rfcietff.htm   
      
   --   
   40+yrs virtualization experience (since Jan68), online at home since Mar1970   
      
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