Introduction
The SNMP agent is implemented on the module. This allows a manager to access MIB II standardized objects from the Modicon X80 agent through the SNMP protocol. The MIB II allows management of TCP/IP communication layers.
This section describes the Simple Network Management Protocol (SNMP).
To configure the SNMP service, refer to the instructions to configure SNMP in the DTM.
Refer also to the description of MIB support for SNMP.
SNMP Structure
SNMP defines network management solutions in terms of network protocols and the exchange of supervised data.
The SNMP structure relies on the following elements:
Manager: The manager allows entire or partial network supervision.
Agents: Each supervised device has one or more software modules named Agent that are used by the SNMP protocol.
MIB: The Management Information Base is a database or collection of objects.
SNMP Protocol
The SNMP protocol defines the types of messages between the agent and the manager. These messages are encapsulated in UDP datagrams.
Messages from the manager to an agent:
Get_Request: This message obtains the value of one or more variables.Get_Next_Request: Obtain the value of the next variables.Set_Request: Set the value of a variable.
Messages from an agent to the manager:
Get_Response: Allows the agent to resend the value of the requested variable.Trap: Allows asynchronous event signaling by the agent.