[c-nsp] "debug tunnel ip" in IOS-XR

[Hank Nussbacher]

I am trying to debug a GRE tunnel issue on an ASR9000 running either
5.1.3 or 5.3.3 and both respond:

RP/0/RSP0/CPU0:petach-tikva-gp#debug tunnel    
% Incomplete command.
RP/0/RSP0/CPU0:petach-tikva-gp#debug tunnel ?
  ip  GRE tunnel(cisco-support)
RP/0/RSP0/CPU0:petach-tikva-gp#debug tunnel ip ?
                                      ^
% Invalid input detected at '^' marker.

What do I need to do to get GRE debugging to work?

Thanks,
Hank