In this video, learn about GRE tunnels keep-alive and how to configure Keep-Alive on GRE to ensure stability and monitoring of tunnel activity. Generic Routing Encapsulation (GRE) tunnels connect two endpoints (a firewall and another device) in a point-to-point logical link. Packets can be routed or forwarded through this tunnel. GRE tunnels are often used for connectivity to services in the cloud and partner networks. The best practice assessment check ensures keep-alive is enabled on GRE tunnels.
For more information on GRE tunneling here are some resources: