Controllerless Networks

I'd like to create a layer-2 gre tunnel to our aruba controller to bridge a vlan to a remote site.  The controller configuration seems straightforward, I set the tunnel destination as the VC address of the IAP cluster, enter the vlan I'd like to bridge, select mode L2, Protocol 1.

I'm stuck on configuring the IAP end.  The only fields I have are "Host", "GRE type" and "Per-AP Tunnel".  This is in AirWave btw.  

I've tried entering the IP of the controller, or the VRRP of the cluster, but I never see any GRE traffic at the controller.  I'm also not sure how to specify which VLANs would be encapsulated from the IAP side.

Any pointers appreciated.  Thanks,

Have you read the Instant VRD v2.0 starting on page 46?  https://www.arubanetworks.com/assets/vrd/Instant_VRD_2.0.pdf

I haven't seen this.  From my reading I think what I need is one of the L2 modes.  It's not so important whether I use centralized or distributed because we're not routing anything from this subnet and they're using static IPs.

"Distributed L2 Mode can be thought of as an L2 extension of the corporate VLAN to remote sites"

This describes exactly what I want to do.  Unfortunately this guide has no information describing HOW to produce this configuration.  

Please take a look at the user guide here:  https://www.arubanetworks.com/techdocs/Instant_423_WebHelp/InstantWebHelp.htm#UG_files/IAP-VPN_Depl_scenarios/Intro.htm%3FTocPath%3DUG%2520topics%7CIAP-VPN%2520Deployment%2520Scenarios%7C_____0

I was ultimately able to get the layer-2 gre tunnels built.  The process is dependent upon building a "Centralized Layer-2 DHCP Scope" in the Instant AP.  I read that step in various documentation but since my use-case is static IP addresses, I didn't want to add a DHCP scope.  As it turns out this appears to be a required part of the configuration.  Once I added this scope, the tunnels came up and tunneled traffic successfully.