300-420 · Question #188
Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN?
The correct answer is C. multicast-replicator. In Cisco SD-WAN (Viptela), the multicast-replicator feature designates one WAN Edge router per VPN to act as the central replication point for multicast traffic. Instead of each WAN Edge router pulling a separate copy of the multicast stream across the WAN, the designated…
Question
Which feature is used to optimize WAN bandwidth of IGMP network traffic among WAN Edge routers in the same VPN?
Options
- AIGMPv2
- Bmulticast RP
- Cmulticast-replicator
- Dmulticast service routes
How the community answered
(63 responses)- A3% (2)
- B2% (1)
- C89% (56)
- D6% (4)
Explanation
In Cisco SD-WAN (Viptela), the multicast-replicator feature designates one WAN Edge router per VPN to act as the central replication point for multicast traffic. Instead of each WAN Edge router pulling a separate copy of the multicast stream across the WAN, the designated replicator receives the stream once and then distributes it to other WAN Edge routers in the same VPN. This eliminates duplicate multicast streams traversing the WAN, significantly reducing bandwidth consumption. IGMPv2 (A) is a host membership protocol version, not a bandwidth optimization feature. A multicast RP (B) is used in PIM sparse mode for source discovery but does not optimize WAN replication across SD-WAN. Multicast service routes (D) are configuration constructs used to define multicast routing policy, not a replication optimization feature.
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