V6100 and V7122 User Guide 355C HAPTER 15: SNMP-B ASEDMANAGEMENTSimple Network Management Protocol (SNMP) is a standard-based network control protocolused to manage elements in a network. The SNMP Manager (usually implemented by aNetwork Manager (NM) or an Element Manager (EM)) 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 see the same database to retrieve information orconfigure 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 MIBsdocumented in IETF RFCs, SNMP additionally enables the use of private MIBs, containing anon-standard information set (specific functionality provided by the NE).Directives, issued by the SNMP Manager to an SNMP Agent, consist of the identifiers ofSNMP variables (referred to as MIB object identifiers or MIB variables) along withinstructions 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 EM, calledSNMP traps.The definitions of MIB variables supported by a particular agent are incorporated indescriptor files, written in Abstract Syntax Notation (ASN.1) format, made available to EMclient programs so that they can become aware of MIB variables and their use.The device contains an embedded SNMP Agent supporting both general network MIBs(such as the IP MIB), VoP-specific MIBs (such as RTP) and our proprietary MIBs (acBoard,acGateway, acAlarm and other MIBs), enabling a deeper probe into the inter-working of thedevice. All supported MIB files are supplied to customers as part of the release.About SNMPSNMP Message StandardFour types of SNMP messages are defined: 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’ objectsupported by a network device given a valid SNMP name. Set - A request that sets a named object to a specific value.
