The implicit SD-WAN rule serves as the final catch-all. Per Fortinet:
"Sessions matching the implicit SD-WAN rule do not have an SD-WAN service id, as they are not associated with any specific user-defined SD-WAN rule. Additionally, this occurs only when traffic fails to match any entry in the policy route table. This default handling guarantees connectivity while minimizing the risk of blackholed traffic."
Administrators can observe this in diagnostic outputs for troubleshooting.
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