350-501 Services Practice Question
Which THREE of the following L3VPN services require the use of a dedicated control plane per VPN instance?
⚠ Common exam trap
Cisco often tests the misconception that all MPLS-based VPN services (including VPLS and MDT VPN) require per-VPN control planes, but only L3VPN services that maintain per-VPN routing tables and separate routing protocol instances (like MPLS L3VPN, 6VPE, and CSC VPN) actually need dedicated control planes per VPN instance.
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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
✓
6VPE
6VPE (IPv6 VPN Provider Edge) requires a dedicated control plane per VPN instance because it uses separate per-VPN routing tables and a distinct BGP session (typically MP-BGP with the IPv6 address family) to exchange IPv6 VPN routes. This ensures that each customer's IPv6 routing information is isolated and processed independently, which is a core requirement for L3VPN services that maintain per-VPN forwarding and control plane separation.
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