- Written by Padmanabh Ratnakar
- Posted on April 20, 2021
- Updated on March 5, 2025
- 15853 Views
The postcard telemetry (GreenT - GRE Encapsulated Telemetry) feature is used to gather per flow telemetry information like path and per hop latency. For network monitoring and troubleshooting flow related issues, it is desirable to know the path, latency and congestion information for flows at different times.