NE40 is configured with a route of 10.3.0.0/24 to black hole.
Symptom: NE40 is configured with ip route 10.3.0.0 255.255.255.0 null 0, and it is imported into ISIS statically, but it is found that it is not imported into ISIS to create LSP.
The priority of the route 10.3.0.0/24 learned by NE40 through ISIS is 15, and the priority of the static route configured for local is 60, so NE40 will not regard the static route as optimal and import it into ISIS. Change the priority of static route to a value less than 15, and then NE40 will regard it as optimal and imports it into ISIS; also, the route will be distributed to R1 at which the route of the network segment learned from GSR is filtered.
According to checkup of routing table at NE40, NE40 learns the route 10.3.0.0/24 from R1 through ISIS , but the routing table of R1 shows that the route is learned from GSR which cannot be logged in for checkup, so it needs to change the configurations of NE40 if R1 is required to point the route from the network segment to NE40.