The value of vRtrInetStaticRouteDisallowIgp specifies if
IGP shortcuts are to be used or not.
The value of vRtrInetStaticRouteDisallowIgp is valid only for indirect
static routes (i.e. vRtrInetStaticRouteStaticType is 'indirect'). If
the value of vRtrInetStaticRouteDisallowIgp is set to 'true', and if
none of the defined tunneling mechanisms (RSVP-TE, LDP or IP)
qualify as a next-hop, the normal IGP next-hop to the indirect
next-hop address will not be used. If the value is set to 'false',
IGP next-hop to the indirect next-hop address can be used as the
next-hop of the last resort.