MRV Communications LX-4000 Series Technical Information Seite 363

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SNMP Configuration
Management Information 14-3
A managed object is one of any number of characteristics of a
managed device. Managed objects are comprised of one or more
object instances. A managed object is identified by an
object
identifier
(OID). The tree consists of a root connected to a
number of labeled nodes via edges. Each node may, in turn,
have children of its own which are labeled. In this case, we may
term the node a subtree.
The Simple Network Management Protocol (SNMP) is an
Internet standard defined by the Internet Engineering Task
Force (IETF) Request for Comment (RFC) 1157, which specifies
how network management information is carried through a
network.
MRV Communications devices support SNMP by implementing
an SNMP Agent. The agent supports SNMP MIB data and makes
it available when requested via SNMP Get/Set requests. In
addition, the LX device generates SNMP Traps, which are
asynchronous messages used to indicate specific events on
the device.
Management Information
Management information is a collection of managed objects,
residing in a virtual information store called the Management
Information Base (MIB). Collections of related objects are
defined in MIB modules and are written using a subset of
ASN.1.The subset is defined by the SMI and is divided into
three parts:
1. Module definitions are used when describing information
modules. An ASN.1 macro MODULE-IDENTITY is used to
convey the semantics of an information module.
2. Object definitions are used when describing managed
objects. An ASN.1 macro OBJECT-TYPE is used to convey the
syntax and semantics of a managed object.
3. Notification definitions are used when describing unsolicited
transmissions of management information. An ASN.1 macro
TRAP-TYPE is used to convey the syntax and semantics
of a trap.
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