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300-410 Practice Question: Is troubleshooting IPv6 redistribution between…
A network engineer is troubleshooting IPv6 redistribution between EIGRP and OSPFv3 on Router R1. Routes from OSPFv3 are being redistributed into EIGRP, but they are not appearing in the EIGRP topology table. Router R1 has the following relevant configuration:
router eigrp Test
address-family ipv6 unicast redistribute ospf 1 metric 10000 100 255 1 1500 !
Router R2 shows: show ipv6 eigrp topology output does not include any OSPF-derived routes. What is the root cause?
⚠ Common exam trap
Cisco often tests the requirement for matching process IDs in redistribution commands, leading candidates to overlook that the redistribute statement references a specific OSPF process that must be active and correctly numbered.
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 OSPFv3 process ID in the redistribute command does not match the actual OSPFv3 process ID running on the router.
The redistribute ospf 1 command references OSPFv3 process ID 1, but if the actual OSPFv3 process ID running on Router R1 is different (e.g., 100), the redistribution will silently fail—no routes are injected into EIGRP. The process ID must match exactly for redistribution to occur.
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 EIGRP metric values are too high, causing the routes to be considered unreachable.
Why it's wrong here
Metric values are within typical ranges; they would still appear in the topology table.
- ✓
The OSPFv3 process ID in the redistribute command does not match the actual OSPFv3 process ID running on the router.
Why this is correct
If the process ID is wrong, the redistribution command does not match any OSPFv3 process, and no routes are redistributed.
- ✗
The routes from OSPFv3 are external, and EIGRP does not redistribute external OSPF routes by default.
Why it's wrong here
The redistribute command includes all OSPF routes unless filtered.
- ✗
The EIGRP address-family is not configured with a router ID, preventing redistribution.
Why it's wrong here
EIGRP for IPv6 does not require a router ID for redistribution.
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.