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300-410 Practice Question: Is troubleshooting a redistribution issue between…
A network engineer is troubleshooting a redistribution issue between EIGRP and OSPF. Router R1 redistributes EIGRP routes into OSPF. The engineer configured a summary route 10.0.0.0/8 using the 'summary-address' command under the OSPF process. After the configuration, OSPF neighbors lose connectivity to the 10.1.0.0/16 subnet, which is one of the component routes. What is the most likely 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
✓
The summary route 10.0.0.0/8 is not being generated because the component routes are not all present in the OSPF database.
The issue is that the summary-address command in OSPF can suppress the advertisement of more specific routes, but if the summary route is not installed due to a missing component or metric issue, it can cause a routing black hole.
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 summary-address command on R1 is configured with the 'tag' keyword, causing the summary to be ignored by other routers.
Why it's wrong here
Incorrect. The tag keyword does not cause the summary to be ignored; it is used for route tagging.
- ✓
The summary route 10.0.0.0/8 is not being generated because the component routes are not all present in the OSPF database.
Why this is correct
Correct. In OSPF, the summary-address command generates a summary only if at least one component route exists in the OSPF database. If the component route is missing due to redistribution issues, the summary may not be generated, and the specific routes may be suppressed.
- ✗
The OSPF neighbor relationship is down due to a mismatch in area IDs.
Why it's wrong here
Incorrect. The symptom is specific to one subnet; neighbor relationships are likely up.
- ✗
The engineer forgot to configure the 'network' command for the summary route under OSPF.
Why it's wrong here
Incorrect. The summary-address command does not require a network statement; it is applied to redistributed routes.
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
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