User's Guide

Chapter 19 Remote Management
EMG1302-R10A User’s Guide
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19.6 The SNMP Screen
Simple Network Management Protocol is a protocol used for exchanging management information
between network devices. Your EMG1302-R10A supports SNMP agent functionality, which allows a
manager station to manage and monitor the EMG1302-R10A through the network. The EMG1302-
R10A supports SNMP version one (SNMPv1) and version two (SNMPv2c). The next figure illustrates
an SNMP management operation.
Figure 78 SNMP Management Model
An SNMP managed network consists of two main types of component: agents and a manager.
An agent is a management software module that resides in a managed device (the EMG1302-
R10A). An agent translates the local management information from the managed device into a form
compatible with SNMP. The manager is the console through which network administrators perform
network management functions. It executes applications that control and monitor managed
devices.
The managed devices contain object variables/managed objects that define each piece of
information to be collected about a device. Examples of variables include such as number of
packets received, node port status etc. A Management Information Base (MIB) is a collection of
managed objects. SNMP allows a manager and agents to communicate for the purpose of accessing
these objects.
SNMP itself is a simple request/response protocol based on the manager/agent model. The
manager issues a request and the agent returns responses using the following protocol operations:
• Get - Allows the manager to retrieve an object variable from the agent.
• GetNext - Allows the manager to retrieve the next object variable from a table or list within an
agent. In SNMPv1, when a manager wants to retrieve all elements of a table from an agent, it
initiates a Get operation, followed by a series of GetNext operations.
• Set - Allows the manager to set values for object variables within an agent.
• Trap - Used by the agent to inform the manager of some events.