Introduction to Community-based SNMPv2
RFC 1901

Document Type RFC - Historic (January 1996; No errata)
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Network Working Group                               SNMPv2 Working Group
Request for Comments: 1901                                       J. Case
Category: Experimental                               SNMP Research, Inc.
                                                           K. McCloghrie
                                                     Cisco Systems, Inc.
                                                                 M. Rose
                                            Dover Beach Consulting, Inc.
                                                           S. Waldbusser
                                          International Network Services
                                                            January 1996

                 Introduction to Community-based SNMPv2

Status of this Memo

   This document specifies an Experimental protocol for the Internet
   community.  This memo does not specify an Internet standard of any
   kind.  Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Table of Contents

   1. Introduction ................................................    1
   2. Components of the SNMPv2 Framework ..........................    2
   2.1 Structure of Management Information ........................    2
   2.2 Textual Conventions ........................................    3
   2.3 Conformance Statements .....................................    3
   2.4 Protocol Operations ........................................    3
   2.5 Transport Mappings .........................................    4
   2.6 Protocol Instrumentation ...................................    4
   3. The Community-based Administrative Framework ................    4
   4. Security Considerations .....................................    5
   5. Editor's Address ............................................    6
   6. Acknowledgements ............................................    6
   7. References ..................................................    7

1.  Introduction

   The purpose of this document is to define the Community-based
   Administrative Framework for the SNMP version 2 framework (SNMPv2).
   The SNMPv2 framework is fully described in [1-6].  This framework is
   derived from the original Internet-standard Network Management
   Framework (SNMPv1), which consists of these three documents:

      STD 16, RFC 1155 [7] which defines the Structure of Management
      Information (SMI), the mechanisms used for describing and naming
      objects for the purpose of management.

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RFC 1901         Introduction to Community-based SNMPv2     January 1996

      STD 16, RFC 1212 [8] which defines a more concise description
      mechanism, which is wholly consistent with the SMI.

      STD 15, RFC 1157 [9] which defines the Simple Network Management
      Protocol (SNMP), the protocol used for network access to managed
      objects.

   For information on coexistence between SNMPv1 and SNMPv2, consult
   [10].

2.  Components of the SNMPv2 Framework

   A 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
   authentication, authorization, access control, and privacy policies.

   Management stations execute management applications which monitor and
   control managed elements.  Managed elements are devices such as
   hosts, routers, terminal servers, etc., which are monitored and
   controlled via access to their management information.

2.1.  Structure of 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) [11].  It is the purpose of the
   Structure of Management Information for SNMPv2 document [1] to define
   that subset.

   The SMI is divided into three parts:  module definitions, object
   definitions, and, trap definitions.

   (1)  Module definitions are used when describing information modules.
        An ASN.1 macro, MODULE-IDENTITY, is used to concisely convey the
        semantics of an information module.

   (2)  Object definitions are used when describing managed objects.  An
        ASN.1 macro, OBJECT-TYPE, is used to concisely convey the syntax
        and semantics of a managed object.

   (3)  Notification definitions are used when describing unsolicited
        transmissions of management information.  An ASN.1 macro,

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