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Structure of Management Information

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In computing, the Structure of Management Information (SMI), an adapted subset of ASN.1, is a technical language used in definitions of Simple Network Management Protocol (SNMP) and its extensions to define sets ("modules") of related managed objects in a Management Information Base (MIB).

SMI subdivides into three parts: module definitions, object definitions, and notification definitions.

  • 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.
  • Object definitions describe managed objects. An ASN.1 macro, OBJECT-TYPE, is used to concisely convey the syntax and semantics of a managed object.
  • Notification definitions (aka "traps") are used when describing unsolicited transmissions of management information. An ASN.1 macro, NOTIFICATION-TYPE, concisely conveys the syntax and semantics of a notification.


  • libsmi, a C library for accessing MIB information[1]


  1. ^ "libsmi - A Library to Access SMI MIB Information". Technical University of Braunschweig. Retrieved 2008-07-31. The core of the libsmi distribution is a library that allows management applications to access SMI MIB module definitions.

External links[edit]

  • RFC 2580, Standard 58, Conformance Statements for SMIv2
  • RFC 2579, Standard 58, Textual Conventions for SMIv2
  • RFC 2578, Standard 58, Structure of Management Information Version 2 (SMIv2)