- A
R1 has no default-metric configured for EIGRP, so redistributed BGP routes use the default metric of infinity, causing them to be unreachable.
Why wrong: Without a default-metric, EIGRP does not redistribute BGP routes; they would not appear in the routing table.
- B
R1 has a route-map that sets the metric to 100000 1000 255 1 1500, which is too high, causing suboptimal path selection.
High metric values make the route less preferred, leading to suboptimal routing.
- C
BGP routes have a lower administrative distance than EIGRP, so they are not installed.
Why wrong: Administrative distance affects route selection between protocols, not the metric within EIGRP.
- D
R2 has a route filter that increases the metric for BGP-originated routes.
Why wrong: No route filter is mentioned.
Quick Answer
The answer is that a route-map setting an excessively high metric is the root cause of suboptimal path selection when redistributing BGP into EIGRP. When BGP routes are redistributed into EIGRP, the metric must be explicitly defined—either via a default-metric command or a route-map—because EIGRP has no default metric for external routes. If the route-map sets values like 100000 1000 255 1 1500, the composite metric becomes artificially inflated, causing EIGRP to prefer other paths or treat the redistributed routes as less desirable, leading to suboptimal traffic flow. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your understanding of EIGRP metric calculation during redistribution and the impact of misconfigured route-maps. A common trap is assuming BGP routes automatically inherit a reasonable metric; instead, remember that EIGRP uses bandwidth, delay, reliability, load, and MTU—so a high delay or bandwidth value can skew the metric. Memory tip: “Big Delay = Bad Path” when redistributing into EIGRP.
300-410 EIGRP Troubleshooting Practice Question
This 300-410 practice question tests your understanding of eigrp troubleshooting. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 BGP-speaking router R1 is redistributing BGP routes into EIGRP. R1 has configuration: router bgp 100 redistribute eigrp 100. Router R2, an EIGRP neighbor, shows: 'show ip route eigrp' includes some BGP routes but with high metrics. Traffic to those destinations is suboptimal. What is the root cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
R1 has a route-map that sets the metric to 100000 1000 255 1 1500, which is too high, causing suboptimal path selection.
When redistributing BGP into EIGRP, the metric must be set explicitly; otherwise, EIGRP uses default metric values (if configured) or rejects the routes. If the metric is set via a route-map or default-metric, incorrect values can cause high metrics.
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.
- ✗
R1 has no default-metric configured for EIGRP, so redistributed BGP routes use the default metric of infinity, causing them to be unreachable.
- ✓
R1 has a route-map that sets the metric to 100000 1000 255 1 1500, which is too high, causing suboptimal path selection.
- ✗
BGP routes have a lower administrative distance than EIGRP, so they are not installed.
Why it's wrong here
Administrative distance affects route selection between protocols, not the metric within EIGRP.
- ✗
R2 has a route filter that increases the metric for BGP-originated routes.
Why it's wrong here
No route filter is mentioned.
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.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: R1 has a route-map that sets the metric to 100000 1000 255 1 1500, which is too high, causing suboptimal path selection. — When redistributing BGP into EIGRP, the metric must be set explicitly; otherwise, EIGRP uses default metric values (if configured) or rejects the routes. If the metric is set via a route-map or default-metric, incorrect values can cause high metrics.
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.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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