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2. Overview

This section gives an overview of the SNMP architecture, the constituents of the protocol, and the services it provides. The Simple Network Management Protocol (SNMP) is an application-layer protocol by which, using the Abstract Syntax Notation One (ASN.1) and the Basic Encoding Rules (BER) defined in [6, 7], logically remote users may inspect or modify the management information of a network element.

The SNMP architecture includes:

  • management of internet resources via the Structure of Management Information (SMI) [4], and the definition of managed objects.
  • the definition of a Management Information Base (MIB) [5] containing the values of managed objects.
  • the protocol itself, for transferring management information between managers and agents.

The protocol provides the following services:

  • get — retrieve the value(s) of one or more instances of managed objects.
  • get-next — retrieve the value of the "next" object instance in the MIB.
  • set — modify the value(s) of one or more instances of managed objects.
  • trap — an unsolicited notification of an event, sent by an agent.

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