Subject: APPN DLUR Architecture Reference Version 1.1 available

From: "Ed Tremblay (254-5515)" <[email-masked]>
Date: Thu, 20 Oct 94 10:00:31 EDT

The APPN DLUR Architecture Reference, Version 1.1, has been updated and
is available by anonymous FTP to networking.raleigh.ibm.com (also known
as networking.cary.ibm.com and ibmstandards.cary.ibm.com) under the
name of aiw/dlur/dlur7.psbin - the file is a PostScript file, but treat
it as binary when you get it and print it.  There are also compressed
versions of the file (aiw/dlur/dlur7.zipbin and aiw/dlur/dlur7.exebin)
as well as a BookManager version (aiw/dlur/dlur7.bookbin).

There is a new document number, SV40-1010-00, associated with the
APPN DLUR Architecture Reference (I've also included the original
document numbering scheme, now up to DLUR-7, on the inside cover).  The
BookManager version of this document will be included in "The Best of
APPC, APPN, and CPI-C" and the "IBM Networking Systems Softcopy
Collection Kit" CD-ROMs later this year.  Eventually the new document
number will be included in the HONE/PUBS system, indicating that the
document is not separately orderable but is included on the CD-ROMs (as
well as the Internet).

The items added in Version 1.1 are:

** 1) added DLUR processing of short RSP(BIND) RUs

      DLUR testing uncovered a condition not described in the
      architecture, specifically how the DLUR BF should process short
      RSP(BIND) RUs.  The RSP(BIND) format does describe an extended
      short response to a nonnegotiable BIND, but the DLUR can receive
      an even shorter response, and there is currently no direction on
      how to process it.

      NCP BF takes a short RSP(BIND) and converts it into an extended
      short RSP(BIND).

      What needs clarification in the DLUR architecture is how to
      convert a short RSP(BIND) into an extended short RSP(BIND).

      The document will be updated to include the following:

         The short +RSP(BIND) is converted into an extended short form
         RSP(BIND) by:

            - zeroing 31 (X'1F') bytes for the extended short form
              RSP(BIND)
            - setting the RU code to BIND (X'31')
            - setting the BIND type to nonnegotiable
            - including the SLU max send size and the PLU max send size
              from the BIND request
            - setting the whole-BIUs required indicator on if the
              RSP(BIND) will be reextended
            - setting the pacing fields in the RSP(BIND) according to
              normal negotiation rules for the PLU stage:
                 * if the ASP indicator will be set to 1, then set the
                   one-stage pacing indicators and zero out the pacing
                   window size fields
                 * if the ASP indicator will be set to 0, then set the
                   pacing window size fields to the BIND request values
            - setting the limited resource bit if the link station is a
              limited resource link (LU 6.2 RSP(BIND)s only)

         and the pacing values for the SLU stage are saved so that fixed
         session pacing will be used with the window sizes specified in
         the BIND request.

** 2) numerous editorial changes - not marked with change bars

      a) the document style has been changed to more closely match the
         APPN Architecture Reference and other external documents;
         notable changes include:

            i) new cover and inside cover pages

           ii) Preface has been moved after the Contents and Figures
               sections and has been divided into:

                    Notices (new material plus Trademarks)
                    About This Book (new material)
                    Acknowledgements
                    Summary Of Changes (was Revisions)

          iii) Appendix A (Definition of Terms) has been moved after
               the appendices, renamed Glossary, with several terms
               added

           iv) Figures 3-1, 6-1, 6-2, and B-2 have been redrawn

      b) (3.3) deleted Structure section - describes a reference model
         which is not an implementation requirement; deleted to reduce
         confusion

      c) (4.2.1, footnote 1) updated the RFC number to the current
         number (1666)

      d) (8.1.4, first sentence) changed "the SLU name specified in the
         NS header" to "the SLU name specified in the RU".

I'll be out of the office October 21-30, so today would be a good day
to flush out downloading problems (I don't expect any).

Ed Tremblay

---

From: Dario Calia <[email-masked]>
Date: Thu, 20 Oct 94 9:10:40 PDT