CiscoCisco SD-WAN Solutions (Ensdwi) 300-415 Certification·EN·Updated 14 Aug 2026
How are multicast service routes and joins handled in the SD-WAN overlay?
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Correct answer: The WAN Edge routers originate multicast service routes to the vSmart controller via OMP, which then forwards joins for requested multicast groups based on IGMP v2 or v3 toward the source or PIM-RP as specified in the original PIM join message..
Why this is the answer
WAN Edge routers are responsible for originating multicast service routes to the vSmart controller using OMP. This is because the WAN Edge routers are at the edge of the service VPNs and are the first point of contact for multicast sources and receivers within the SD-WAN fabric. The vSmart controller then uses this routing information to forward IGMPv2 or IGMPv3 join messages from receivers towards the multicast source or the PIM Rendezvous Point (RP), effectively building the multicast distribution tree. The incorrect options either incorrectly state that the vSmart controller originates the service routes (it aggregates them) or specify outdated IGMP versions (v1 is not supported for this function in Cisco SD-WAN).