350-501 Architecture Practice Question
An SP engineer notices that BGP routes from a CE are not being installed in the VRF routing table, although the BGP session is established. The VRF configuration includes route-target import 100:1. The CE is sending routes with RT 100:1. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the distinction between a BGP session being up and routes being installed in the VRF, leading candidates to overlook the import map as a filtering mechanism that can block routes even when the RT matches.
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 is not matching any import map
Even though the BGP session is up and the CE is sending routes with the correct route-target (RT 100:1), the VRF may have an import map applied. An import map filters which received VPN routes are actually installed into the VRF routing table. If the route does not match the conditions defined in that import map, it will be accepted by BGP but not installed, which explains the symptom.
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 BGP route is suppressed due to route update delay
Why it's wrong here
BGP update delay is not a common cause for routes not being installed.
- ✓
The route is not matching any import map
Why this is correct
If an import map is configured, only routes matching the map are imported.
- ✗
The VRF name does not match
Why it's wrong here
VRF name misconfiguration would prevent session establishment, but session is up.
- ✗
The RD is not configured
Why it's wrong here
RD is required for VRF, but its absence would cause other issues; session might not establish.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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