- 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.
Troubleshooting High Metrics in EIGRP Redistribution from BGP
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?
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.
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.
Option B is correct because the route-map explicitly sets a high composite metric (100000 1000 255 1 1500) for redistributed BGP routes into EIGRP. This high metric causes R2 to prefer other paths (if available) or to consider the route less optimal, leading to suboptimal traffic forwarding. The configuration snippet indicates that a route-map is applied during redistribution, which overrides any default-metric and directly inflates the metric.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Why this is correct
High metric values make the route less preferred, leading to suboptimal routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
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: answer the scenario, not the keyword
Cisco often tests the distinction between missing default-metric (causing unreachable routes) versus a configured but excessively high metric (causing suboptimal routing), leading candidates to incorrectly assume the routes are missing rather than present with inflated metrics.
Detailed technical explanation
How to think about this question
EIGRP uses a composite metric based on bandwidth, delay, reliability, load, and MTU (K values). When redistributing from BGP into EIGRP, if no default-metric or route-map is used, EIGRP assigns a default metric of infinity, making routes unreachable. A route-map can set specific metric components; in this case, setting delay to 1000 (tens of microseconds) and bandwidth to 100000 (kbps) results in a very high composite metric, causing suboptimal path selection. In real-world scenarios, this often happens when engineers copy-paste route-map configurations without adjusting metric values for the target network.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
EIGRP Troubleshooting — This question tests EIGRP Troubleshooting — Read the scenario before looking for a memorised answer..
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. — Option B is correct because the route-map explicitly sets a high composite metric (100000 1000 255 1 1500) for redistributed BGP routes into EIGRP. This high metric causes R2 to prefer other paths (if available) or to consider the route less optimal, leading to suboptimal traffic forwarding. The configuration snippet indicates that a route-map is applied during redistribution, which overrides any default-metric and directly inflates the metric.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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