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Introduction
1-3
Industrial Ethernet OSM/ESM Network Management
C79000-G8976-C137-08
1.1.2 Communication
Protocol
SNMP uses the connectionless protocol UDP (User Datagram Protocol).
Getting Information
To read the required status information, the manager sends a Get request to the
agent of the device. The addressed component answers the request with a
Response message.
Making Settings
To change the current configuration of a managed device, the manager sends a
Set request.
Status changes can be notified to the manager event-driven and without polling by
the agent sending a Trap message.
Management
Application
UDP
IP
Network Layer
SNMP Manager
SNMP Managed
Object
UDP
IP
Network Layer
SNMP Agent
SNMP
Messages
Figure 1-1 SNMP Communication
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