Question 776 of 1,420
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350-401 Practice Question: A service provider is migrating a customer from a…
A service provider is migrating a customer from a global routing table to a VRF on a Cisco ASR 1000. The customer has a BGP session with the provider for internet access. After moving the customer's interface to VRF CUSTOMER_D, the BGP session goes down. The engineer verifies that the VRF is configured with the correct route-target and that the BGP neighbor is configured under address-family ipv4 vrf CUSTOMER_D. What else is missing?
⚠ Common exam trap
Cisco often tests the fact that applying a VRF to an interface removes the IP address, leading candidates to overlook the need to reconfigure it, and instead focus on BGP or VRF configuration errors.
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 IP address on the interface was removed when the VRF was applied, and it was not reconfigured.
When a VRF is applied to an interface on a Cisco ASR 1000, the interface's IP address is removed because the VRF changes the routing context. The engineer must reconfigure the IP address under the VRF interface. Without the IP address, the BGP session cannot establish a TCP connection, causing it to go down.
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 IP address on the interface was removed when the VRF was applied, and it was not reconfigured.
Why this is correct
Correct because the ip vrf forwarding command clears the IP address on the interface, requiring it to be re-entered.
- ✗
The BGP neighbor is not configured with the password command.
Why it's wrong here
Incorrect because a password is not required for BGP to come up.
- ✗
The route-target import/export values are incorrect for the customer.
Why it's wrong here
Incorrect because route-targets affect VPNv4 route distribution, not the BGP session directly.
- ✗
The engineer forgot to configure the VRF under the BGP router-id.
Why it's wrong here
Incorrect because the router-id is global and not VRF-specific.
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Last reviewed: Jun 24, 2026
This 350-401 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 350-401 exam.
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