RFC 22 (rfc22) - Page 2 of 2

Host-host control message formats

Alternative Format: Original Text Document

RFC 22             Host-Host Control Message Formats        October 1969


    <6>                        Please stop transmitting over link
                                  number L.  This is called the CEASE
                                  directive.

    <7>                        We are CLOSING our output link number
                                  L.  You may get this message before
                                  the last message arrives over this
                                  link since control messages are higher
                                  priority than regular data messages.

    <8>                        UNCEASE: that is, you may resume
                                  transmitting over output link number
                                  L.

   Each control message is embedded in the appropriate message structure
   e.g.:

               <-------------32 bits --------------->
               |           HEADER                   |
               |____________________________________|
               |      |       |           |         |
               | mark |  l    |       |     |
               |______|_______|___________|_________|
               |                 |                  |
               |     checksum    |     Padding      |
               |_________________|__________________|
                 typical control message (please
                 establish auxiliary link #L2
                 parallel to our primary link #l)

   The header for all HOST-HOST control messages is given below:

   0     3  4   7  8  9   10   14   LINK#      24              31
   _______________________________________________________________
   |       |      |     |       |               |////////////////|
   | FLAGS | TYPE |  H  |  SITE | 00000001      |////////////////|
   |_______|______|_____|_______|_______________|________________|

   where  FLAGS - 0000
          TYPE  - 0000 (regular message)
          H     - host #(0-3) at SITE (usually 0 for single HOST sites)
          SITE  - Site #
          LINK# - 00000001 (HOST-HOST control link)


       [ This RFC was put into machine readable form for entry ]
      [ into the online RFC archives by Alison De La Cruz 12/00 ]




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