The answer is that the EEM applet fails to trigger because redistribution into EIGRP without a seed metric fails silently, generating no syslog message. When a route is redistributed from OSPF into EIGRP without a configured seed metric, the EIGRP process simply drops the route—it does not log an error or produce an 'IP-4-ROUTING' syslog event, since no routing table change occurs. This EEM redistribution silent failure no syslog scenario is a classic trap on the Cisco CCNP ENARSI 300-410 exam, testing your understanding that EIGRP requires an explicit metric for redistributed routes, and that the absence of one causes a quiet failure rather than a logged error. The exam often pairs this with questions about event syslog pattern matching, where candidates mistakenly assume any redistribution attempt triggers a syslog. Remember the mnemonic: "No metric, no message—EIGRP drops without a fuss."
300-410 Embedded Event Manager (EEM) Practice Question
This 300-410 practice question tests your understanding of embedded event manager (eem). The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A network engineer configures an EEM applet to monitor redistribution events using the event syslog pattern 'IP-4-ROUTING'. The applet is intended to log when a route is redistributed from OSPF into EIGRP. The redistribution is configured without a seed metric for EIGRP, and the route is not redistributed. The EEM applet does not trigger. Which is the most likely explanation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Redistribution into EIGRP without a seed metric fails silently, and no syslog message is generated.
When redistributing routes into EIGRP without a seed metric, the redistribution fails silently—no syslog message is generated. The EIGRP process drops the redistributed route because the default metric is not set. The 'IP-4-ROUTING' syslog message is only generated when a routing table change occurs due to redistribution, but since the route is not installed, no syslog is produced. The EEM applet will not trigger because there is no matching syslog event.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Redistribution into EIGRP without a seed metric fails silently, and no syslog message is generated.
Why this is correct
Correct. EIGRP requires a seed metric; without it, the route is not redistributed and no syslog is generated.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
The EEM applet must use 'event routing' to capture redistribution events.
Why it's wrong here
EEM does not have an 'event routing' trigger; syslog is the correct method.
✗
The syslog pattern 'IP-4-ROUTING' is incorrect; it should be 'IP-5-ROUTING'.
Why it's wrong here
The pattern is correct for routing table changes, but no change occurs.
✗
The redistribution is blocked by route tagging, preventing the syslog.
Why it's wrong here
Route tagging is not involved in this scenario.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Trap categories for this question
Scenario analysis trap
Route tagging is not involved in this scenario.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Embedded Event Manager (EEM) — This question tests Embedded Event Manager (EEM) — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Redistribution into EIGRP without a seed metric fails silently, and no syslog message is generated. — When redistributing routes into EIGRP without a seed metric, the redistribution fails silently—no syslog message is generated. The EIGRP process drops the redistributed route because the default metric is not set. The 'IP-4-ROUTING' syslog message is only generated when a routing table change occurs due to redistribution, but since the route is not installed, no syslog is produced. The EEM applet will not trigger because there is no matching syslog event.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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