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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
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Chapter 12 SNMP
SNMP Basic Components
An agent is a software module that resides in a managed device. An agent has local knowledge of
management information and translates that information into a form compatible with SNMP. The SNMP
agent gathers data from the MIB, which is the repository for device parameter and network data. The
agent can also send traps, which are notifications of certain events (such as changes), to the manager.
Figure 12-2 illustrates these SNMP operations.
Figure 12-2 SNMP Agent Gathering Data from a MIB and Sending Traps to the Manager
A management system such as HP OpenView executes applications that monitor and control managed
devices. Management systems provide the bulk of the processing and memory resources required for
network management. One or more management systems must exist on any managed network.
Figure 12-3 illustrates the relationship between the three key SNMP components.
Figure 12-3 Example of the Primary SNMP Components
get, get-next, get-bulk
Network device
get-response, traps
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SNMP Manager
NMS
MIB
SNMP Agent
Management
Entity
Agent
Management
Database
Agent
NMS
Management
Database
Managed Devices
Agent
Management
Database
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