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300-410 Practice Question: Is troubleshooting a VRF-Lite setup where two…
A network engineer is troubleshooting a VRF-Lite setup where two customer VRFs (VRF_A and VRF_B) are configured on a router. The engineer notices that routes from VRF_A are appearing in the routing table of VRF_B, causing traffic misdirection. The router is running IOS-XE 17.3. What is the most likely cause of this issue?
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 'route-target import' and 'route-target export' commands are misconfigured, causing VRF_A routes to be imported into VRF_B.
The issue is caused by route leaking between VRFs, which can occur if VRF route import/export configurations are misapplied or if routes are accidentally redistributed between VRFs. In VRF-Lite, VRFs are isolated by default, and any cross-VRF route sharing must be explicitly configured.
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 router has 'ip routing' disabled globally.
Why it's wrong here
Disabling IP routing would prevent all routing, not just cross-VRF route sharing.
- ✓
The 'route-target import' and 'route-target export' commands are misconfigured, causing VRF_A routes to be imported into VRF_B.
Why this is correct
Incorrect route-target configuration can lead to unintended route leaking between VRFs.
- ✗
The 'ip vrf forwarding' command is missing on the interfaces.
Why it's wrong here
Missing VRF forwarding on interfaces would prevent traffic from entering the correct VRF, but would not cause cross-VRF route sharing.
- ✗
The router is running OSPF with the same process ID in both VRFs.
Why it's wrong here
OSPF process IDs are local to the router and do not cause cross-VRF route sharing.
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
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