3Com VCX V7122/SIP VoIP Gateway User Manual
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SNMP Management
SNMP Overview
SNMP (Simple Network Management Protocol) is a standard network-based client/Server-
based control protocol to manage devices in the network. The client program (called the
Network Manager) makes connections to a server program, called the SNMP Agent. The
SNMP Agent, embedded on a remote network device, serves information to the Network
Manager regarding the device's status. The database used by the Agent to retrieve
information, is referred to as the SNMP Management Information Base (MIB), and is a
standard set of statistical and control values. Apart from the standard MIBs documented in
IETF’s RFCs, SNMP additionally allows the usage of private MIBs, containing non-standard
information set.
Directives, issued by the network manager client 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 the identifier, or set the identifier to a new value.
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
network management client programs so that they can become aware of MIB variables and
their usage.
The VCX V7122/SIP Gateway contains an embedded SNMP Agent supporting both general
network MIBs (such as the IP MIB), VoIP-specific MIBs (such as RTP and Trunk) and a
proprietary MIB (known also as 3Com MIB) enabling a deeper probe into the inner working of
the Gateway. All the supported MIBs files are supplied as part of the release.
SNMP Messages
Four types of SNMP messages are defined:
Get
– Request that returns the value of a named object.
Get-Next
– Request that returns the next name (and value) of the next object supported
by a network device given a valid SNMP name.
Set
– Request that sets a named object to a specific value.
Trap
– Message generated asynchronously by network devices. It notifies the network
manager of a problem apart from polling of the device.
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