Information about Packet Duplication
Cisco IOS XE SD-WAN devices use packet duplication to overcome packet loss.
Packet duplication sends copies of packets on alternate available paths to reach Cisco IOS XE SD-WAN devices. If one of the packets is lost, a copy of the packet is forwarded to the server. Receiving Cisco IOS XE SD-WAN devices discard copies of the packet and forward one packet to the server.
Packet duplication is suitable for edges with multiple access links. Once packet duplication is configured and pushed to your device, you can see the tunnel packet duplication statistics.
Packet duplication interop on Cisco IOS XE SD-WAN devices is not supported between Cisco IOS XE Release 16.x and Cisco IOS XE Release 17.x versions.