SNMP inform

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

An SNMP inform is a notification message that requires acknowledgment from the receiving network management system.

An SNMP inform is a notification message that reports an event to a network management system (NMS) and requires acknowledgment. The NMS acknowledges it with a Response message; without a Response, the managed device retransmits the inform. section 6.2.3

Distinguish informs from related SNMP notifications:

• Use informs when reliable delivery matters: unlike Traps, informs are acknowledged by the NMS. section 6.2.3
• Treat an event as received only after the managed device receives the NMS Response; otherwise, it retransmits the inform. section 6.2.3
• Associate informs with SNMPv2 and SNMPv3; SNMPv1 defines no Inform message type. section 6.3
• Configure devices to send Traps, Informs, or both, depending on the notification requirement. section 6.2.3

Figure 6.7 The two notification messages: Trap and Inform. Whereas Traps are unacknowledged, the NMS acknowledges each Inform with a Response message.

Compare the unacknowledged Trap path with the acknowledged Inform-and-Response exchange. section 6.2.3

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes

Explains acknowledgment, retransmission, and Trap contrast but stops short of device-specific Inform configuration.

Examples

Uses interface-down and high-temperature events to illustrate notification delivery.

What it assumes

Assumes basic knowledge of SNMP, NMS, managed devices, and notification messages while distinguishing Inform behavior explicitly.

What you can do after

Evaluate whether an acknowledged Inform or an unacknowledged Trap better fits an event-notification requirement.

How it connects

Connects SNMP informs with Traps, Response messages, NMS, managed devices, SNMPv2, and SNMPv3.

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Related concepts

• SNMP Trapcontrasts with · An SNMP trap is an unsolicited, unacknowledged notification message sent by a managed device to report an event to a network management system.
• SNMP Responseused by · An SNMP Response is a message from an agent that returns the result or requested values for a manager request or confirms receipt of an Inform message.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.