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The Traffic Monitoring guide (https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/ios-xe-17/policies-book-xe/traffic-flow-monitor.html#concept_wd2_zjm_5pb) states that the IPFIX template has 32-bit ingressoverlaysessionid (1243...
Got confirmation from Cisco Support:"Unfortunately, at this time, the Overlay Session ID information is not persistent. This decision was apparently was due to shear amount of data that would have needed to be processed."
After making Cflowd policy configuration changes and upgrading both vManage (to 20.10.1.1) and cEdges (to 17.10.1a) in the lab, we found the session IDs had changed in the IPFIX exports from both.routers. So it seems the session/overlay ID is unique ...
