- A
0
Why wrong: 0 is not a valid default metric for redistribution.
- B
1
Why wrong: 1 is the default metric for connected routes.
- C
20
OSPFv3 uses a default metric of 20 for redistributed routes.
- D
10
Why wrong: 10 is the default metric for RIP.
Question 679 of 2,152
OSPFv3 Redistributed Route Default Metric: 20
This 300-410 practice question tests your understanding of ipv6 traffic filtering and urpf. 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.
What is the default metric for an IPv6 static route redistributed into OSPFv3?
Quick Answer
The answer is 20. This is the default metric assigned to any redistributed route, including an IPv6 static route, when it is injected into OSPFv3, matching the behavior of its IPv4 counterpart, OSPFv2. The OSPFv3 process applies this seed metric of 20 to all external routes (Type 5 and Type 7 LSAs) unless you explicitly override it with the metric keyword during redistribution. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of OSPFv3 redistribution fundamentals, often appearing in configuration or troubleshooting scenarios where a redistributed static route fails to appear in the routing table due to an unexpected metric value. A common trap is assuming OSPFv3 uses a different default than OSPFv2, or that the metric for a directly connected interface applies to redistributed routes. To remember, think of the number 20 as the “default entry ticket” for any external route into OSPFv3—it never changes unless you manually hand it a different one.
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
✓
20
When an IPv6 static route is redistributed into OSPFv3, OSPFv3 assigns a default metric of 20 to external routes (type E1 or E2). This is consistent with OSPFv2 behavior, where redistributed routes (including static routes) receive a default metric of 20 unless explicitly overridden with the `metric` keyword under the `redistribute` command. Option C is correct because the default metric for redistributed static routes in OSPFv3 is 20.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the default metric for OSPFv3 redistributed routes (20) with the default metric for OSPFv3 intra-area routes (1) or with the default metric used by other routing protocols like EIGRP (10), leading them to select the wrong option.
Detailed technical explanation
How to think about this question
Under the hood, OSPFv3 uses the same metric semantics as OSPFv2 for external routes: the default metric of 20 is defined in RFC 2328 (OSPFv2) and carried forward to OSPFv3 (RFC 5340). This metric applies to both E1 and E2 external route types, and it can be modified using the `redistribute` command with the `metric` option. In real-world scenarios, forgetting to adjust this default metric can lead to suboptimal routing, as the redistributed static route may be preferred over other paths with lower metrics.
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?
IPv6 Traffic Filtering and uRPF — This question tests IPv6 Traffic Filtering and uRPF — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 20 — When an IPv6 static route is redistributed into OSPFv3, OSPFv3 assigns a default metric of 20 to external routes (type E1 or E2). This is consistent with OSPFv2 behavior, where redistributed routes (including static routes) receive a default metric of 20 unless explicitly overridden with the `metric` keyword under the `redistribute` command. Option C is correct because the default metric for redistributed static routes in OSPFv3 is 20.
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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