300-415 · Question #152
How is multicast routing enabled on devices in the Cisco SD-WAN overlay network?
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.
Question
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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.
How the community answered
(42 responses)- A90% (38)
- B10% (4)
Why each option
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.
WAN Edge routers act as IGMP proxies, sending multicast service routes via OMP to the vSmart controller. The vSmart then processes IGMP v2 or v3 join messages and orchestrates the forwarding of PIM joins towards the multicast source or PIM-RP, enabling efficient multicast traffic delivery across the overlay.
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
Source: 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
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