This article provide information about the traceflow functionality with service interface on the T1 connected to overlay segment.
Topology:
VM --- Segment_Overlay ---(Service Interface)--T1-SR --- T0-DR --- T0-SR --- External-Server
When running NSX Traceflow from the UI, it fails and stops immediately at Physical Hop Count 0 ("Injected").
VMware NSX
VMware NSX-T Datacenter
Currently, Traceflow has limitation when an overlay segment uses a service interface on the T1 gateway to connect to an external network