Protocol Operations for version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1448

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Network Working Group                                  J. Case
          Request for Comments: 1448                 SNMP Research, Inc.
                                                           K. McCloghrie
                                                      Hughes LAN Systems
                                                                 M. Rose
                                            Dover Beach Consulting, Inc.
                                                           S. Waldbusser
                                              Carnegie Mellon University
                                                              April 1993

                               Protocol Operations
                               for version 2 of the
                   Simple Network Management Protocol (SNMPv2)

          Status of this Memo

          This RFC specifes an IAB standards track protocol for the
          Internet community, and requests discussion and suggestions
          for improvements.  Please refer to the current edition of the
          "IAB Official Protocol Standards" for the standardization
          state and status of this protocol.  Distribution of this memo
          is unlimited.

          Table of Contents

          1 Introduction ..........................................    2
          1.1 A Note on Terminology ...............................    2
          2 Overview ..............................................    3
          2.1 Roles of Protocol Entities ..........................    3
          2.2 Management Information ..............................    3
          2.3 Access to Management Information ....................    4
          2.4 Retransmission of Requests ..........................    4
          2.5 Message Sizes .......................................    5
          2.6 Transport Mappings ..................................    6
          3 Definitions ...........................................    7
          4 Protocol Specification ................................   12
          4.1 Common Constructs ...................................   12
          4.2 PDU Processing ......................................   12
          4.2.1 The GetRequest-PDU ................................   13
          4.2.2 The GetNextRequest-PDU ............................   15
          4.2.2.1 Example of Table Traversal ......................   16
          4.2.3 The GetBulkRequest-PDU ............................   18
          4.2.3.1 Another Example of Table Traversal ..............   21
          4.2.4 The Response-PDU ..................................   22
          4.2.5 The SetRequest-PDU ................................   23
          4.2.6 The SNMPv2-Trap-PDU ...............................   26
          4.2.7 The InformRequest-PDU .............................   27

          Case, McCloghrie, Rose & Waldbusser                   [Page i]



          RFC 1448        Protocol Operations for SNMPv2      April 1993

          5 Acknowledgements ......................................   29
          6 References ............................................   33
          7 Security Considerations ...............................   35
          8 Authors' Addresses ....................................   35

          Case, McCloghrie, Rose & Waldbusser                   [Page 1]



          RFC 1448        Protocol Operations for SNMPv2      April 1993

          1.  Introduction

          A network management system contains: several (potentially
          many) nodes, each with a processing entity, termed an agent,
          which has access to management instrumentation; at least one
          management station; and, a management protocol, used to convey
          management information between the agents and management
          stations.  Operations of the protocol are carried out under an
          administrative framework which defines both authentication and
          authorization policies.

          Network management stations execute management applications
          which monitor and control network elements.  Network elements
          are devices such as hosts, routers, terminal servers, etc.,
          which are monitored and controlled through access to their
          management information.

          Management information is viewed as a collection of managed
          objects, residing in a virtual information store, termed the
          Management Information Base (MIB).  Collections of related
          objects are defined in MIB modules.  These modules are written
          using a subset of OSI's Abstract Syntax Notation One (ASN.1)
          [1], termed the Structure of Management Information (SMI) [2].

          The management protocol, version 2 of the Simple Network
          Management Protocol, provides for the exchange of messages
          which convey management information between the agents and the