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300-410 Practice Question: Is troubleshooting a VRF-Lite scenario where a…
A network engineer is troubleshooting a VRF-Lite scenario where a router is configured with two VRFs (VRF_X and VRF_Y). The engineer notices that routes from VRF_X are not being advertised to the neighbor router via eBGP. The BGP configuration includes 'neighbor 10.1.1.2 remote-as 65002' under the VRF_X BGP address-family. The 'show bgp vpnv4 unicast all neighbors' command shows the BGP session is established. 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 for the prefix is configured under the global BGP configuration, not under the VRF address-family.
In VRF-Lite with BGP, routes must be explicitly injected into the VRF BGP table. Missing the 'network' command or redistribution under the VRF address-family is a common issue.
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 for the prefix is configured under the global BGP configuration, not under the VRF address-family.
Why this is correct
For VRF-Lite, the network command must be under the VRF address-family to advertise routes from that VRF.
- ✗
The BGP session is not using the correct update-source interface.
Why it's wrong here
While update-source is important, the session is already established, so this is not the issue.
- ✗
The 'maximum-paths' command is set to 1.
Why it's wrong here
Maximum-paths affects load balancing, not route advertisement.
- ✗
The 'bgp router-id' command is missing.
Why it's wrong here
A router ID is required, but BGP will automatically select one if not configured.
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.
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
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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.