300-415 Question #152: Real Exam Question with Answer & Explanation

The correct answer is 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.. Multicast routing in Cisco SD-WAN involves WAN Edge routers originating multicast service routes to the vSmart controller via OMP, which then forwards IGMPv2/v3 joins towards the source or PIM-RP.

Architecture

Question

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

Options

AThe 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.
BThe 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.

Explanation

Multicast routing in Cisco SD-WAN involves WAN Edge routers originating multicast service routes to the vSmart controller via OMP, which then forwards IGMPv2/v3 joins towards the source or PIM-RP.

Common mistakes.

B. This option is incorrect because Cisco SD-WAN multicast routing supports IGMP v2 and v3, but not IGMP v1, for forwarding multicast group joins.

Concept tested. Cisco SD-WAN multicast routing enablement

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-config-guide/cisco-sd-wan-gs-config-guide-xe-17-x/multicast.html

Topics

#Multicast routing#SD-WAN overlay#OMP#IGMP

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