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352-001 · Question #422
352-001 Question #422: Real Exam Question with Answer & Explanation
The correct answer is A: MVPN for IPv6 multicast service. IPv6 multicast over MPLS 6PE/6VPE requires either MVPN extensions for IPv6 or a Layer 2 MPLS overlay model, since neither 6PE nor 6VPE provides native IPv6 multicast support by default.
Question
Service provider XYZ wants to implement IPv6 on their MPLS network using MPLS 6PE or 6VPE techniques. Currently XYZ providers IPv4 multicast services over an MPLS network by using MVPN, and wants to provide parallel IPv6 multicast services. Which two multicast solutions enable the IPv6 multicast services? (Choose 2)
Options
- AMVPN for IPv6 multicast service
- BMPLS 6PE, because it provides IPv6 multicast support by default
- CPIM-DM to enable IPv6 multicast in conjunction with MPLS 6PE/6VPE
- Dan overlay model using Layer 2 MPLS tunnels
- EMPLS 6VPE, because it provides IPv6 multicast support by default
Explanation
IPv6 multicast over MPLS 6PE/6VPE requires either MVPN extensions for IPv6 or a Layer 2 MPLS overlay model, since neither 6PE nor 6VPE provides native IPv6 multicast support by default.
Common mistakes.
- B. MPLS 6PE enables IPv6 unicast forwarding over an IPv4/MPLS core using labeled BGP routes but does not include any IPv6 multicast capability by default.
- C. PIM-DM uses flood-and-prune dense mode behavior that is operationally unsuitable for service provider environments and is not a supported multicast mechanism in conjunction with MPLS 6PE or 6VPE.
- E. MPLS 6VPE enables IPv6 VPN unicast services over an MPLS core but does not natively support IPv6 multicast without additional extensions such as MVPN for IPv6.
Concept tested. IPv6 multicast service delivery over MPLS 6PE and 6VPE
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