The SystemEDGE agent uses a lightweight, flexible SNMP architecture to monitor systems. SNMP is a standard for managing TCP/IP-based networks and devices. At its most basic level, SystemEDGE performs the agent role in the SNMP framework: it carries out SNMP-based instructions on managed objects. Instructions may come from a management system or from the agent itself, and these instructions may be requests for information about an object or requests to modify system parameters. The SystemEDGE agent carries out these requests and sends a reply to the requesting application. The agent exchanges information adhering to standard SNMP protocol, so any manager that can communicate through SNMP can integrate with the agent.
The SystemEDGE agent accesses system metrics through MIB attributes. A MIB is a store of management information that adheres to a common attribute format. The agent can collect or modify attributes in all MIBs that it supports and maintains.
Note: For more information about supported MIBs, see the chapter "Introduction."
The SystemEDGE agent communicates through SNMP on UDP port 161 by default (you can change this port during installation). In an SNMPv1 environment, it uses the following standard SNMP message types to exchange management information:
Obtains the value of a specific object from the MIB. A management system sends this message to the agent when requesting specific information about a system.
Obtains the next object instance.
Returns the requested MIB object information to the requesting application.
Instructs the agent to change the value of a MIB object
Notifies a management system of exceptions. Traps allow the agent to send unsolicited messages to a manager. For more information, see SNMP Traps.
In an SNMPv2 environment, the standard SNMP message types to exchange management information is:
Obtains values (tabular) for one or more than one MIB objects. This is similar to GetNextRequest.
This common SNMP workflow (get or set request, retrieval, or modification of MIB attribute, SNMP reply) comprises the base of all SystemEDGE functionality. However, the agent can move beyond basic SNMP collection to intelligent monitoring and state management. For more information, see Monitoring Architecture and State Management Model.
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