The event none command is used within an Embedded Event Manager (EEM) applet configuration to register the policy without associating it with a specific system event trigger. This configuration makes the applet available to be executed "on demand" or manually. The applet can then be invoked from the command-line interface (CLI) using the event manager run command or called by another EEM policy. This method is ideal for creating reusable scripts or for tasks that require manual initiation by a network administrator.

A. event register is not a valid EEM event detector command. While some event detectors use the keyword register as an option, it is not used to define a manual trigger.

B. event manual is not a valid EEM event detector command. The term "manual" describes how the applet is run, but it is not the keyword used in the configuration to define the trigger.

D. This configuration is syntactically invalid as it completely omits the mandatory event command. An EEM applet must contain at least one event command to define its triggering condition.

1. Cisco IOS XE Embedded Event Manager (EEM) Configuration Guide

Cisco IOS XE Gibraltar 16.12.x

Section: "Configuring an EEM Applet to Run On Demand or Manually"

Content: "The event none command registers an EEM applet without an event so that it can be run on demand. The applet can be run manually from the CLI using the event manager run applet-name command..." This section explicitly details the use and purpose of the event none command for creating on-demand applets.

2. Cisco IOS Embedded Event Manager Command Reference

Command: event none

Usage Guidelines: "To configure an Embedded Event Manager (EEM) applet to run on demand or manually

use the event none command in applet configuration mode... This command registers an EEM applet but does not associate an event with it." This reference directly confirms the function of the event none command.

3. Cisco IOS XE Programmability Configuration Guide

Cisco IOS XE 17

Section: "Embedded Event Manager Overview"

Content: This guide describes the fundamental structure of an EEM applet

stating that it consists of an event statement and an action statement. This confirms that an applet without an event statement (as in option D) is invalid.