- A
When redistributing EIGRP into OSPF, the OSPF metric must be explicitly configured if the default metric of 20 is not desired.
Correct: OSPF uses a default metric of 20 for redistributed routes, so explicit configuration is needed to change it.
- B
When redistributing OSPF into EIGRP, the default EIGRP metric is 1.
Why wrong: Incorrect: EIGRP does not have a default metric; routes are not redistributed unless a seed metric is set.
- C
When redistributing OSPF into EIGRP, the default EIGRP metric is 100.
Why wrong: Incorrect: There is no default metric for EIGRP redistribution; it must be explicitly defined.
- D
When redistributing OSPF into EIGRP, a seed metric must be configured for EIGRP to advertise the redistributed routes.
Correct: EIGRP requires a seed metric; otherwise, routes are not injected.
- E
Route-maps cannot be used to filter routes during redistribution between EIGRP and OSPF.
Why wrong: Incorrect: Route-maps are commonly used to filter and manipulate routes during redistribution.
Quick Answer
The correct answer is that when redistributing OSPF into EIGRP, a seed metric must be configured for EIGRP to advertise the redistributed routes, and OSPF assigns a default metric of 20 to redistributed routes unless a seed metric is manually set. This is because each routing protocol requires an explicit seed metric when receiving redistributed routes; EIGRP uses a composite metric of bandwidth, delay, reliability, load, and MTU, and without a configured seed metric, EIGRP defaults to an infinite metric, effectively suppressing the route. OSPF, on the other hand, automatically assigns a metric of 20 to redistributed external routes (type E2) if no seed metric is specified. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of seed metric defaults and redistribution behavior, with a common trap being the assumption that EIGRP or OSPF will inherit metrics automatically—they will not. A reliable memory tip is "EIGRP needs explicit, OSPF defaults to 20," reminding you that EIGRP requires manual seed metric configuration, while OSPF provides a default of 20 for redistributed routes.
300-410 Route Redistribution Practice Question
This 300-410 practice question tests your understanding of route redistribution. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
Which TWO statements about route redistribution between EIGRP and OSPF are true? (Choose TWO.)
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
When redistributing EIGRP into OSPF, the OSPF metric must be explicitly configured if the default metric of 20 is not desired.
When redistributing between EIGRP and OSPF, the seed metric must be explicitly set for the receiving protocol. EIGRP uses a composite metric (bandwidth, delay, reliability, load, MTU) and OSPF uses a metric of type 1 or type 2. By default, OSPF assigns a metric of 20 to redistributed routes unless specified otherwise. Option A is correct because OSPF requires a seed metric for redistributed routes. Option D is correct because EIGRP redistributed routes default to an infinite metric (effectively not advertised) unless a seed metric is provided. Option B is incorrect because OSPF default metric is 20, not 1. Option C is incorrect because the default metric for EIGRP is not 100. Option E is incorrect because route-maps can be used to filter redistributed routes.
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.
- ✓
When redistributing EIGRP into OSPF, the OSPF metric must be explicitly configured if the default metric of 20 is not desired.
- ✗
When redistributing OSPF into EIGRP, the default EIGRP metric is 1.
- ✗
When redistributing OSPF into EIGRP, the default EIGRP metric is 100.
- ✓
When redistributing OSPF into EIGRP, a seed metric must be configured for EIGRP to advertise the redistributed routes.
- ✗
Route-maps cannot be used to filter routes during redistribution between EIGRP and OSPF.
Why it's wrong here
Incorrect: Route-maps are commonly used to filter and manipulate routes during redistribution.
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?
Route Redistribution — This question tests Route Redistribution — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: When redistributing EIGRP into OSPF, the OSPF metric must be explicitly configured if the default metric of 20 is not desired. — When redistributing between EIGRP and OSPF, the seed metric must be explicitly set for the receiving protocol. EIGRP uses a composite metric (bandwidth, delay, reliability, load, MTU) and OSPF uses a metric of type 1 or type 2. By default, OSPF assigns a metric of 20 to redistributed routes unless specified otherwise. Option A is correct because OSPF requires a seed metric for redistributed routes. Option D is correct because EIGRP redistributed routes default to an infinite metric (effectively not advertised) unless a seed metric is provided. Option B is incorrect because OSPF default metric is 20, not 1. Option C is incorrect because the default metric for EIGRP is not 100. Option E is incorrect because route-maps can be used to filter redistributed routes.
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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