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300-410 Practice Question: In MPLS L3VPN, what is the default behavior when…
In MPLS L3VPN, what is the default behavior when a PE router receives a VPNv4 route with a Route Target that does not match any import RT on any VRF?
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 stored in the BGP table but not installed in any VRF routing table.
The PE will still store the route in its BGP table (since BGP accepts all routes by default), but it will not install it into any VRF routing table because the import filter rejects it.
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 route is stored in the BGP table but not installed in any VRF routing table.
Why this is correct
BGP keeps all received routes in its table; the VRF import filter determines which routes are actually used in the VRF.
- ✗
The route is discarded and not stored in the BGP table.
Why it's wrong here
BGP does not discard routes based on RT; it stores them but does not import them into VRFs if the RT does not match.
- ✗
The route is installed in the global routing table.
Why it's wrong here
VPNv4 routes are only for VRFs; they are not installed in the global table.
- ✗
The route is advertised to all other PEs.
Why it's wrong here
The route is already received; it is not re-advertised unless policy dictates.
Go deeper
Related to this question
Learn chapter
OSPF Route Summarization and Filtering
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.