Sun Microsystems Netscape Enterprise Server, Руководство администратора

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SNMP Basics
198 Netscape Enterprise Server Administrator’s Guide
SNMP Basics
SNMP is a protocol used to exchange data about network activity. With SNMP,
data travels between a managed device and a network management station
(NMS) where users remotely manage the network. A managed device is
anything that runs SNMP such as hosts, routers, and Netscape servers.
An NMS is usually a powerful workstation with one or more network
management applications installed. A network management application such as
HP OpenView graphically shows information about managed devices. For
example, it might show which servers in your enterprise are up or down, or the
number and type of error messages received. When you use SNMP with a
Netscape server, this information is transferred between the NMS and the sever
through the use of two types of agents.
SNMP Subagent
The subagent gathers information about the server and passes the information
to the server’s master agent. Every Netscape server, except for the
Administration Server, has as subagent.
SNMP Master Agent
The master agent exchanges information between the various subagents and
the NMS. The master agent is installed with Enterprise Administration Server.
You can have multiple subagents installed on a host computer, but only one
master agent. For example, if you had Directory Server, Enterprise Server, and
the Messaging Server installed on the same host, the subagents for each of the
servers would communicate with the same master agent.