The Article provides detail on Traffic drop observed when the tunnel route resolves over a route, which the next hop was set to discard.

1. On all Junos and Junos Evolved platforms, having dynamic tunnels configured, during forward route evaluation, the tunnel route is not resolving over a valid route with proper nexthop instead is resolving on a static route (0.0.0.0/0) which points to discard (blackhole) nexthop.
2. As there is no check if the nexthop is of type discard, reject or black hole and causes the composite next-hop to point towards the black hole.
3. This leads the tunnel to go down and the traffic hitting the tunnel to drop. When the issue is hit, the error message "ENOENT -- Item not found" will be seen.

The below CLI command can be used to check the issue:

user@device> show dynamic-tunnels database terse

This issue might be seen if the following conditions are met:

* On all Junos and Junos Evolved platforms

* Dynamic tunnels configured

* Tunnel route is resolving over a route which next hop was set to discard

In order to resolve the issue , upgrade Junos to below Fixed Junos versions

20.3X75-D43

21.4R3-S5

22.2R3-S1

22.4R3

23.1R2

23.2R1

23.2R2