Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)
RFC 2572

Document Type RFC - Draft Standard (April 1999; No errata)
Obsoleted by RFC 3412
Obsoletes RFC 2272
Last updated 2013-03-02
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IESG IESG state RFC 2572 (Draft Standard)
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Network Working Group                                            J. Case
Request for Comments: 2572                            SNMP Research Inc.
Obsoletes: 2272                                            D. Harrington
Category: Standards Track                        Cabletron Systems, Inc.
                                                              R. Presuhn
                                                      BMC Software, Inc.
                                                               B. Wijnen
                                               IBM T. J. Watson Research
                                                              April 1999

               Message Processing and Dispatching for the
               Simple Network Management Protocol (SNMP)

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This document describes the Message Processing and Dispatching for
   SNMP messages within the SNMP architecture [RFC2571].  It defines the
   procedures for dispatching potentially multiple versions of SNMP
   messages to the proper SNMP Message Processing Models, and for
   dispatching PDUs to SNMP applications.  This document also describes
   one Message Processing Model - the SNMPv3 Message Processing Model.

Table of Contents

   1. Introduction ................................................    3
   2. Overview ....................................................    3
   2.1. The Dispatcher.  ..........................................    5
   2.2. Message Processing Subsystem ..............................    5
   3. Elements of Message Processing and Dispatching ..............    5
   3.1. messageProcessingModel ....................................    6
   3.2. pduVersion ................................................    6
   3.3. pduType ...................................................    7
   3.4. sendPduHandle .............................................    7
   4. Dispatcher Elements of Procedure ............................    7
   4.1. Sending an SNMP Message to the Network ....................    7

SNMPv3 Working Group        Standards Track                     [Page 1]
RFC 2572           Message Processing and Dispatching           April 1999

   4.1.1. Sending a Request or Notification .......................    7
   4.1.2. Sending a Response to the Network .......................    9
   4.2. Receiving an SNMP Message from the Network ................   11
   4.2.1. Message Dispatching of received SNMP Messages ...........   11
   4.2.2. PDU Dispatching for Incoming Messages ...................   12
   4.2.2.1. Incoming Requests and Notifications ...................   12
   4.2.2.2. Incoming Responses ....................................   14
   4.3. Application Registration for Handling PDU types ...........   15
   4.4. Application Unregistration for Handling PDU Types .........   16
   5. Definitions .................................................   16
   5.1. Definitions for SNMP Message Processing and Dispatching ...   16
   6. The SNMPv3 Message Format ...................................   20
   6.1. msgVersion ................................................   21
   6.2. msgID .....................................................   21
   6.3. msgMaxSize ................................................   21
   6.4. msgFlags ..................................................   22
   6.5. msgSecurityModel ..........................................   24
   6.6. msgSecurityParameters .....................................   24
   6.7. scopedPduData .............................................   24
   6.8. scopedPDU .................................................   25
   6.8.1. contextEngineID .........................................   25
   6.8.2. contextName .............................................   25
   6.8.3. data ....................................................   25
   7. Elements of Procedure for v3MP ..............................   25
   7.1. Prepare an Outgoing SNMP Message ..........................   36
   7.2. Prepare Data Elements from an Incoming SNMP Message .......   31
   8. Intellectual Property .......................................   37
   9. Acknowledgements ............................................   37
   10. Security Considerations ....................................   39
   11. References .................................................   40
   12. Editors' Addresses .........................................   41
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