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300-410 Practice Question: An engineer configures mutual redistribution…
An engineer configures mutual redistribution between EIGRP and OSPF on a router. EIGRP routes are redistributed into OSPF with a route-map that sets metric-type type-1, and OSPF routes are redistributed into EIGRP with default metric 10000 100 255 1 1500. Unexpectedly, the router starts flapping routes between the two protocols, causing instability. Which is the most likely explanation?
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
✓
The redistribution is not using route tags, so routes are being re-redistributed back and forth, causing route flapping.
Without route tagging, mutual redistribution can cause a routing loop where a route redistributed from EIGRP into OSPF is then redistributed back into EIGRP with a different metric, creating a feedback loop. The router sees the same prefix from both protocols and may prefer one over the other, causing continuous updates. The solution is to use route tags to prevent re-redistribution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The redistribution is not using route tags, so routes are being re-redistributed back and forth, causing route flapping.
Why this is correct
Without tags, there is no loop prevention; routes can be redistributed multiple times.
- ✗
The OSPF metric-type type-1 is incompatible with EIGRP, causing the route to be rejected.
Why it's wrong here
Metric-type is valid and does not cause flapping.
- ✗
The EIGRP default metric is missing the reliability and load values, so redistribution fails.
Why it's wrong here
The metric includes all five values (bandwidth, delay, reliability, load, MTU) correctly.
- ✗
The router must have `redistribute connected` under both protocols to avoid flapping.
Why it's wrong here
Connected redistribution is not related to the loop issue.
Visual reference
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.