MRV Communications LX-4000 Series Información técnica Pagina 362

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14-2 Network Management System
LX Series Configuration Guide
Network Management System
Network Management Systems monitor and control network
elements. Network Elements (NE) are devices, such as hosts,
routers, and terminal servers, that are monitored and controlled
through access to their management information.
The NMS can potentially monitor several nodes, each with a
processing entity termed an agent. An agent is a network
management software module that resides in a managed
device. It has local knowledge of management information and
can translate that information into a form compatible with
SNMP. The managed objects might be configuration parameters
or performance statistics relating to the device being managed.
Operations of the protocol are carried out under an
administrative framework that defines both authentication and
authorization policies in SNMPv1, SNMPv2C, and SNMPv3.
Figure 14.1 Typical Network Management System
All SNMP-managed devices contain a Management Information
Base (MIB) database that stores management information for
that device. The database is organized as a
tree; branches of the
tree name
objects and the leaves of the tree contain the values
manipulated to effect management. The values are comprised of
managed objects and are identified by object identifiers. Objects
in the MIB are defined using Abstract Syntax Notation One
(ASN.1). The MIB structure is depicted in RFC 1155, “The
Structure of Management Information” or SMI.
MANAGEMENT SYSTEM MANAGED ELEMENT
MANAGER
AGENT
SNMP
Human
Network
Manager
Management
Database
Management
Database
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