Troubleshooting Tip: Packet duplication on-demand in SD-WAN is not working

[mle2802]

Description	This article describes how to troubleshoot when packet is not duplicated when SD-WAN packet duplication is set to 'on-demand'.
Scope	FortiGate.
Solution	From the SD-WAN configuration, verify packet duplication is configured according to Duplication on-demand when SLAs in the configured service are matched | FortiGate / FortiOS 7.2.0 | .... However, when testing using ICMP protocol, traffic is sent via only 1 VPN tunnel instead of both tunnels configured in SD-WAN. To trigger packet duplication on-demand, all members must be out of SLA. If one member is out of SLA and the other is in SLA, packet duplication will not trigger if it is configured as on-demand.   After confirming all members are out of SLA, generate traffic again and confirm packet duplication is triggered.