In order to establish a GRE tunnel on NE20E 172.17.33.82 to NE20E-S8 172.17.33.170 (and the reverse path as well) as shown in the picture .
We use static routes to have reachability from the node with loopback 172.17.33.82 to 172.17.33.170 and the other way around.
The tunnel configuration is the following on both routers:
Tunnels don’t come up:
You need to configure tunnel interface starting with the number from target board.
For our configuration, target-board is 9 and the tunnel interface should be 9/ 0/100.