[c-nsp] Cisco ASR901 and Tunnels

[Ivan]

I have some Cisco ASR901s and would like to have a layer 2 or layer 3
tunnel between them over a layer 3 network.

I have configured GRE and tunnel is up and it is possible to ping the
remote ends.  All looks good from the control plane side but I am not
having success with traffic being forwarded.

Although I have been able to configure this as far as I can tell there is
nothing in the doco for this.  I am thinking it maybe one of those "you
can configure but not supported" things.

Can anyone confirm if GRE tunnels or similar are actually supported?

Hardware: ASR 901
Software: 15.4(1)S1
License Level: IPBase

Thanks

Ivan