Hi Hector,
Could you please share the topology and the configuration applied on both devices?, if you want to move traffic through a GRE Tunnel, you must enable routing between the endpoints, using static routing or dynamic routing protocols like RIP, EIGRP, OSPF. If the GRE Tunnel is the backup, you can play with the administrative distances.
Also please share the show ip interface brief output to see the tunnel up on both sides.
:-)
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