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300-410 Practice Question: Is troubleshooting a VRF-Lite configuration on a…
A network engineer is troubleshooting a VRF-Lite configuration on a Cisco router. The router has two VRFs (VRF_RED and VRF_BLUE) configured with OSPF as the routing protocol. The engineer notices that OSPF neighborships are not forming between routers in VRF_RED. The 'show ip ospf neighbor' command shows no neighbors. 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 OSPF process is not configured with the 'vrf VRF_RED' command.
OSPF neighborships in VRF-Lite require that the OSPF process is associated with the correct VRF and that interfaces are placed in the correct VRF. Missing VRF association in the OSPF process or incorrect interface VRF assignment are common issues.
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 OSPF process ID is not unique across VRFs.
Why it's wrong here
OSPF process IDs can be the same across VRFs without issues.
- ✗
The interfaces in VRF_RED are missing the 'ip ospf network point-to-point' command.
Why it's wrong here
While this could affect neighbor formation, it is not the most common cause for no neighbors at all.
- ✓
The OSPF process is not configured with the 'vrf VRF_RED' command.
Why this is correct
Without the VRF association in the OSPF process, OSPF will not form neighborships on interfaces belonging to that VRF.
- ✗
The 'router-id' command is missing in the OSPF process.
Why it's wrong here
While a router ID is required, OSPF can automatically select one from the highest loopback or interface IP.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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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.