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300-410 Practice Question: Is troubleshooting a VRF-Lite configuration where…
A network engineer is troubleshooting a VRF-Lite configuration where a router is using RIP as the routing protocol in VRF_BLUE. The engineer notices that RIP routes are not being learned from a neighbor router. The 'show ip rip database vrf VRF_BLUE' shows no entries. The 'show ip vrf interfaces VRF_BLUE' shows the correct interface. 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 'network' command is configured under the global RIP process, not under the VRF address-family.
RIP in VRF-Lite requires that the RIP process be associated with the VRF and that the network command is issued under the VRF context. Missing the 'address-family ipv4 vrf VRF_BLUE' configuration is a common oversight.
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 'network' command is configured under the global RIP process, not under the VRF address-family.
Why this is correct
For RIP to operate in a VRF, the network command must be under the VRF address-family.
- ✗
The 'version 2' command is missing under the VRF address-family.
Why it's wrong here
RIPv1 can still learn routes, though it is less common.
- ✗
The 'no auto-summary' command is missing.
Why it's wrong here
Auto-summary could cause route summarization but not complete failure to learn routes.
- ✗
The 'timers basic' command is set to a very low value.
Why it's wrong here
Timer misconfiguration could cause route flapping, but not total absence of 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.
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
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