When using the diagnose sys session list command, SD-WAN-specific session steering is indicated by the presence of the sdwan_service_id field in the session data. This identifier ties the session directly to a specific SD-WAN rule or service. As noted in the Fortinet documentation: “Sessions that are handled according to SD-WAN rules will include a service ID tag (sdwan_service_id) in their session listing. This allows administrators to correlate live sessions with SD-WAN policy matches for troubleshooting and visibility.” This is a crucial diagnostic tool, as it distinguishes between traffic managed by traditional routing and that explicitly controlled by SD-WAN steering logic, aiding in operational insight and troubleshooting.
[References:, [FCSS_SDW_AR-7.4 1-0.docx Q15], FortiOS 7.4 CLI Reference, “diagnose sys session list: SD-WAN Service ID Tagging”, SD-WAN 7.4 Concept Guide, Section: "Session Identification for SD-WAN Traffic", ]
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