Implementing Cisco SD-WAN Solutions (ENSDWI) — Question 97

How is multicast routing enabled on devices in the Cisco SD-WAN overlay network?

Answer options

• A. 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.
• B. 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 v1 or v2 toward the source or PIM-RP as specified in the original PIM join message.
• C. The vSmart controller originates multicast service routes to the WAN Edge routers via OMP, which then forwards joins for requested multicast groups based on IGMP v1 or v2 toward the source or PIM-RP as specified in the original PIM join message.
• D. The vSmart controller originates multicast service routes to the WAN Edge routers 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.

Correct answer: A

Explanation

The correct answer is A because the WAN Edge routers are responsible for originating multicast service routes to the vSmart controller using OMP, and they utilize IGMP v2 or v3 for forwarding joins. Options B and C are incorrect as they mention IGMP v1 and misplace the origin of multicast service routes. Option D incorrectly states that the vSmart controller originates the routes instead of the WAN Edge routers.