300-415 · Question #339
Which SD-WAN devices require multicast PIM and IGMP configurations when setting up SD-WAN multicast?
The correct answer is C. branch devices with multicast receivers. In Cisco SD-WAN multicast, branch devices that have local multicast receivers must be configured with PIM and IGMP so they can participate in multicast group membership and forwarding.
Question
Options
- Adatacenter replicator devices
- Bdatacenter devices with multicast sources
- Cbranch devices with multicast receivers
- Dbranch devices with unicast traffic
How the community answered
(26 responses)- A4% (1)
- C92% (24)
- D4% (1)
Why each option
In Cisco SD-WAN multicast, branch devices that have local multicast receivers must be configured with PIM and IGMP so they can participate in multicast group membership and forwarding.
Datacenter replicator devices function as SD-WAN multicast replicators within the overlay and do not require traditional PIM or IGMP on their service-side interfaces for that role.
Datacenter devices that host multicast sources simply send multicast traffic into the network and do not require IGMP or PIM configurations on the SD-WAN overlay side for source-side operation.
Branch devices with multicast receivers need IGMP to allow receivers to join multicast groups and PIM to enable multicast routing on the service-side interface. These protocols are required on the LAN-facing side of WAN Edge routers at branches to properly handle multicast traffic from the overlay toward local receivers.
Branch devices carrying only unicast traffic have no multicast group membership requirements and therefore do not need PIM or IGMP configured.
Concept tested: SD-WAN multicast PIM and IGMP placement
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/multicast/ios-xe-17/multicast-book-xe/m-multicast-sdwan.html
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