Mediant 2000 Management; Using Snmp; Snmp Standards And Objects - AudioCodes Mediant 2000 User Manual

User's Manual
8

Mediant 2000 Management

Two types of Mediant 2000 management are detailed in this section:
SNMP-Based Client Program - Refer to "Using SNMP" below
Web interface - Refer to ''Embedded Web Server'' on page
8.1

Using SNMP

Simple Network Management Protocol (SNMP) is a standards-based network control
protocol for managing elements in a network. The SNMP Manager (usually
implemented by a network Management System (NMS) or an Element Management
System (EMS)) connects to an SNMP Agent (embedded on a remote Network
Element (NE)) to perform network element Operation, Administration and
Maintenance (OAM).
Both the SNMP Manager and the NE refer to the same database to retrieve
information or configure parameters. This database is referred to as the Management
Information Base (MIB), and is a set of statistical and control values. Apart from the
standard MIBs documented in IETF RFCs, SNMP additionally enables the use of
proprietary MIBs, containing non-standard information set (specific functionality
provided by the Network Element).
Directives, issued by the SNMP Manager to an SNMP Agent, consist of the identifiers
of SNMP variables (referred to as MIB object identifiers or MIB variables) along with
instructions to either get the value for that identifier, or set the identifier to a new value
(configuration). The SNMP Agent can also send unsolicited events towards the EMS,
called SNMP traps.
The definitions of MIB variables supported by a particular agent are incorporated in
descriptor files, written in Abstract Syntax Notation (ASN.1) format, made available to
EMS client programs so that they can become aware of MIB variables and their
usage.
The Mediant 2000 contains an embedded SNMP Agent supporting both general
network MIBs (such as the IP MIB), VoP-specific MIBs (such as RTP) and
AudioCodes' proprietary MIBs (AcBoard, acGateway, AcAlarm and other MIBs)
enabling a deeper probe into the inter-working of the Gateway. All supported MIB files
are supplied to Customers as part of the release.
8.1.1

SNMP Standards and Objects

Four types of SNMP messages are defined:
8.1.1.1 SNMP Message Standard
Get - A request that returns the value of a named object.
Get-Next - A request that returns the next name (and value) of the "next" object
supported by a network device given a valid SNMP name.
Set - A request that sets a named object to a specific value.
Trap - A message generated asynchronously by network devices. It notifies the
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8. Mediant 2000 Management
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June 2006