300-415 Question 161
Select 3A company has deployed Cisco SD-WAN in their network and wants to enable multicast traffic to support video streaming services across branch sites. What must be configured to ensure multicast packets are forwarded across the SD-WAN fabric?
- A
Enable multicast on the vSmart controllers and configure OMP to support multicast routes.
- B
Configure PIM (Protocol Independent Multicast) on the WAN Edge routers to manage multicast forwarding.
- C
Enable IGMP (Internet Group Management Protocol) on the LAN interfaces of the branch routers.
- D
Configure multicast replication on the vEdge routers using the 'multicast-replication' feature.
- E
Set up GRE tunnels between branch routers to carry multicast traffic.
Show answer and explanation
Correct answers: A, C, D
Explanation
In Cisco SD-WAN, multicast traffic is supported using OMP to advertise multicast routes, IGMP to manage group memberships, and the multicast-replication feature to replicate and forward traffic efficiently. Unlike traditional networks that use PIM or GRE tunnels, Cisco SD-WAN simplifies multicast forwarding by leveraging its overlay fabric and centralized control via vSmart and WAN Edge routers.
- A. Correct.
Correct. Multicast support in Cisco SD-WAN requires enabling multicast routing on the vSmart controllers and configuring OMP to advertise multicast routes to the WAN Edge routers.
- B. Incorrect.
Incorrect. PIM is not directly used in Cisco SD-WAN for multicast forwarding. Cisco SD-WAN uses a different mechanism involving OMP and multicast replication.
- C. Correct.
Correct. IGMP must be enabled on LAN interfaces to manage multicast group memberships at the branch level.
- D. Correct.
Correct. The 'multicast-replication' feature on vEdge routers ensures multicast traffic is replicated and forwarded to the appropriate destinations across the SD-WAN fabric.
- E. Incorrect.
Incorrect. GRE tunnels are not required for multicast traffic in Cisco SD-WAN, as the fabric itself supports multicast forwarding using OMP and replication techniques.