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Appendix B 339

APPN Network Management Using the Simple Network Management Protocol

Introduction to SNMP

The Simple Network Management Protocol (SNMP) is an

industry-standard management protocol, originally designed for

managing TCP/IP networks. SNMP is described by a series of Request

for Comments (RFCs) that speciﬁes and structures the information that

is exchanged between managing and managed systems. Although SNMP

is used predominately in TCP/IP networks, its popularity has caused its

use to be extended to managing additional software and hardware

products.

An SNMP agent is a process that runs on a system being managed and

maintains the MIB database for the system. An SNMP manager is an

application that generates requests for MIB information and processes

the responses. The manager and agent communicate using the Simple

Network Management Protocol.

SNMP agents (like the SNMPD daemon) typically have predeﬁned MIB

objects that they can access. An SNMP subagent is used to extend the

number and type of MIB objects that an SNMP agent can support.

An SNMP manager can issue requests to an agent either to retrieve

information from the agent's MIB (an SNMP Get request), or to change

information in the agent's MIB (an SNMP Set request). An SNMP agent

can also send unsolicited messages to the SNMP manager (SNMP traps).

The interaction between SNMP components in a system is shown in

Figure B-1, “Overview of SNMP.”

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