Textual Conventions for Version 2 of the Simple Network Management Protocol (SNMPv2)
RFC 1903

Document Type RFC - Draft Standard (January 1996; No errata)
Obsoleted by RFC 2579
Obsoletes RFC 1443
Last updated 2013-03-02
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Network Working Group                               SNMPv2 Working Group
Request for Comments: 1903                                       J. Case
Obsoletes: 1443                                      SNMP Research, Inc.
Category: Standards Track                                  K. McCloghrie
                                                     Cisco Systems, Inc.
                                                                 M. Rose
                                            Dover Beach Consulting, Inc.
                                                           S. Waldbusser
                                          International Network Services
                                                            January 1996

                          Textual Conventions
                          for Version 2 of the
              Simple Network Management Protocol (SNMPv2)

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.

Table of Contents

   1. Introduction ................................................    1
   1.1 A Note on Terminology ......................................    2
   2. Definitions .................................................    3
   3. Mapping of the TEXTUAL-CONVENTION macro .....................   19
   3.1 Mapping of the DISPLAY-HINT clause .........................   19
   3.2 Mapping of the STATUS clause ...............................   21
   3.3 Mapping of the DESCRIPTION clause ..........................   21
   3.4 Mapping of the REFERENCE clause ............................   21
   3.5 Mapping of the SYNTAX clause ...............................   22
   4. Security Considerations .....................................   22
   5. Editor's Address ............................................   22
   6. Acknowledgements ............................................   22
   7. References ..................................................   23

1.  Introduction

   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

SNMPv2 Working Group        Standards Track                     [Page 1]
RFC 1903             Textual Conventions for SNMPv2         January 1996

   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.

   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].

   When designing a MIB module, it is often useful to define new types
   similar to those defined in the SMI.  In comparison to a type defined
   in the SMI, each of these new types has a different name, a similar
   syntax, but a more precise semantics.  These newly defined types are
   termed textual conventions, and are used for the convenience of
   humans reading the MIB module.  It is the purpose of this document to
   define the initial set of textual conventions available to all MIB
   modules.

   Objects defined using a textual convention are always encoded by
   means of the rules that define their primitive type.  However,
   textual conventions often have special semantics associated with
   them.  As such, an ASN.1 macro, TEXTUAL-CONVENTION, is used to
   concisely convey the syntax and semantics of a textual convention.

   For all textual conventions defined in an information module, the
   name shall be unique and mnemonic, and shall not exceed 64 characters
   in length.  (However, names longer than 32 characters are not
   recommended.) All names used for the textual conventions defined in
   all "standard" information modules shall be unique.

1.1.  A Note on Terminology

   For the purpose of exposition, the original Internet-standard Network
   Management Framework, as described in RFCs 1155 (STD 16), 1157 (STD
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