What is at both ends of the tunnel? Two Aruba controllers, or an Aruba controller and another device?
Try a layer-2 tunnel first to bridge two subnets together: http://community.arubanetworks.com/t5/ArubaOS-and-Controllers/Using-GRE-Tunnels-to-centralize-L3-access/td-p/2831
It is more straightforward than a layer 3 tunnel. See if that works.
At Aruba, we believe that the most dynamic customer experiences happen at the Edge. Our mission is to deliver innovative solutions that harness data at the Edge to drive powerful business outcomes.
© Copyright 2021 Hewlett Packard Enterprise Development LPAll Rights Reserved.