A logistics company wants a Nexus switch to shut a named downlink at the moment a named uplink goes down, and not because a clock reached a set time. Which on-box tool binds that interface event to the shutdown?
Select an answer to reveal the explanation.
Short Explanation
You want a tripwire on one door that locks the other door while the alarm is still sounding. You use an EEM applet whose event is the uplink going down and whose action shuts the downlink at that moment. The scheduler only understands a clock, so it cannot notice the uplink no matter how often it runs.
Full Explanation
Embedded Event Manager ties an event on the switch to an action. The event can be the uplink transitioning down, and the action can be a CLI command that shuts the named downlink. Nothing in that chain waits for a timetable, which is what this logistics company asked for. The onboard scheduler runs a job at a time you configure. It does not subscribe to interface state, so it cannot shut the downlink at the moment the uplink fails. POAP is a day-0 process that looks for an initial configuration when a switch boots without a startup configuration. It is not where you install an ongoing interface-down reaction, and that reaction is not limited to first boot. SPAN copies frames from a source to a destination. It does not treat a quiet source as a command to shut another interface. Caveat: the applet has to be registered, and a brief flap can shut the downlink unless the event is written for the failure you actually care about. Operational check: lower the uplink in a test window, confirm the downlink is shut by the applet, and confirm no scheduled job ran at that moment.