[j-nsp] GRE configuration

[Stephen Stuart]

> I have configured two GRE tunnels unnumbered. The problem is that
> when the router gets a GRE packet it does not forward the packet
> after the decapsulation although the route is existing. When
> monitoring the gre interface the incoming packets are all measured
> correctly. I can also see the incoming gre packets from the ethernet
> interface. The Junos version is 5.1R2.4

GRE tunnels should be configured as logical units of the tunnel PIC's
"gr-X/Y/Z" instance, not as logical units of "gre."

Stephen