About the SNMP operations

An SNMP application can read values for the SNMP objects (for monitoring of devices) and some applications can also change the variables (to provide remote management of devices). Basic SNMP operations include:

• Get. Gets a specified SNMP object for a device.
• Get next. Gets the next object in a table or list.
• Set. Sets the value of an SNMP object on a device.
• Trap. Sends a message about an event (that occurs on the device) to the management application.

The SNMP agent software on a device listens on port 161 for requests from an SNMP application. The SNMP agent and application communicate using User Datagram Protocol (UDP). Trap messages, which are unsolicited messages from a device, are sent to port 162.

Note: If an SNMP application makes a request for information about a device but an SNMP agent is not enabled on the device, the UDP packets are discarded.

See Also Using SNMP SNMP overview Enabling SNMP on Windows devices Monitoring an SNMP Service About the SNMP Agent or Manager About the SNMP Management Information Base About SNMP Object Names and Identifiers Using the SNMP MIB Manager Using the SNMP MIB Manager to troubleshoot MIB files Using a custom name for SNMP device interfaces About SNMP security Using the Trap Definition Import Tool