APPN Implementer's Workshop Closed Pages Document DLSw v2.0 Enhancements
RFC 2166

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Network Working Group                                     D. Bryant
Request for Comments: 2166                                3Com Corp
Category: Informational                                 P. Brittain
                                               Data Connection Ltd.
                                                          June 1997

                      APPN Implementer's Workshop
                         Closed Pages Document

                         DLSw v2.0 Enhancements

Status of this Memo

This memo provides information for the Internet community.  This memo
does not specify an Internet standard of any kind.  Distribution of
this memo is unlimited.

Abstract

   This document specifies

   - a set of extensions to RFC 1795 designed to improve the scalability
     of DLSw
   - clarifications to RFC 1795 in the light of the implementation
     experience to-date.

   It is assumed that the reader is familiar with DLSw and RFC 1795.  No
   effort has been made to explain these existing protocols or
   associated terminology.

   This document was developed in the DLSw Related Interest Group (RIG)
   of the APPN Implementers Workshop (AIW). If you would like to
   participate in future DLSw discussions, please subscribe to the DLSw
   RIG mailing lists by sending a mail to majordomo@raleigh.ibm.com
   specifying 'subscribe aiw-dlsw' as the body of the message.

Table of Contents

   1. INTRODUCTION ................................................    3
   2. HALT REASON CODES............................................    3
   3. SCOPE OF SCALABILITY ENHANCEMENTS............................    4
   4. OVERVIEW OF SCALABILITY ENHANCEMENTS.........................    6
   5. MULTICAST GROUPS AND ADDRESSING..............................    7
   5.1 USING MULTICAST GROUPS......................................    8
   5.2 DLSW MULTICAST ADDRESSES....................................    8
   6. DLSW MESSAGE TRANSPORTS......................................    8
   6.1 TCP/IP CONNECTIONS ON DEMAND................................    9
    6.1.1 TCP CONNECTIONS ON DEMAND RACE CONDITIONS................    9

Bryant & Brittain            Informational                      [Page 1]
RFC 2166              APPN Implementer's Workshop             June 1997

   6.2 SINGLE SESSION TCP/IP CONNECTIONS...........................    9
    6.2.1 EXPEDITED SINGLE SESSION TCP/IP CONNECTIONS..............   10
     6.2.1.1 TCP PORT NUMBERS......................................   10
     6.2.1.2 TCP CONNECTION SETUP..................................   10
     6.2.1.3 SINGLE SESSION SETUP RACE CONDITIONS..................   10
     6.2.1.4 TCP CONNECTIONS WITH NON-MULTICAST CAPABLE DLSW PEERS.   11
   6.3 UDP DATAGRAMS...............................................   12
    6.3.1 VENDOR SPECIFIC FUNCTIONS OVER UDP.......................   12
    6.3.2 UNICAST UDP DATAGRAMS....................................   12
    6.3.3 MULTICAST UDP DATAGRAMS..................................   13
   6.4 UNICAST UDP DATAGRAMS IN LIEU OF IP MULTICAST...............   13
   6.5 TCP TRANSPORT...............................................   14
   7. MIGRATION SUPPORT............................................   14
   7.1 CAPABILITIES EXCHANGE.......................................   14
   7.2 CONNECTING TO NON-MULTICAST CAPABLE NODES...................   15
   7.3 COMMUNICATING WITH MULTICAST CAPABLE NODES..................   15
   8. SNA SUPPORT..................................................   16
   8.1 ADDRESS RESOLUTION..........................................   16
   8.2 EXPLORER FRAMES.............................................   16
   8.3 CIRCUIT SETUP...............................................   17
   8.4 EXAMPLE SNA SSP MESSAGE SEQUENCE............................   17
   8.5 UDP RELIABILITY.............................................   19
    8.5.1 RETRIES..................................................   19
   9. NETBIOS......................................................   20
   9.1 ADDRESS RESOLUTION..........................................   21
   9.2 EXPLORER FRAMES.............................................   21
   9.3 CIRCUIT SETUP...............................................   21
   9.4 EXAMPLE NETBIOS SSP MESSAGE SEQUENCE........................   22
   9.5 MULTICAST RELIABILITY AND RETRIES...........................   24
   10. SEQUENCING..................................................   24
   11. FRAME FORMATS...............................................   25
   11.1 MULTICAST CAPABILITIES CONTROL VECTOR......................   25
    11.1.1 DLSW CAPABILITIES NEGATIVE RESPONSE.....................   26
   11.2 UDP PACKETS................................................   26
   11.3 VENDOR SPECIFIC UDP PACKETS................................   27
   12. COMPLIANCE STATEMENT........................................   28
   13. SECURITY CONSIDERATIONS.....................................   29