mrt_afi2aid
if ((aid = mrt_afi2aid(afi, -1, verbose)) == AID_UNSPEC)
if ((aid = mrt_afi2aid(afi, safi, verbose)) == AID_UNSPEC)
if ((aid = mrt_afi2aid(afi, safi, verbose)) == AID_UNSPEC)
if ((aid = mrt_afi2aid(afi, -1, verbose)) == AID_UNSPEC)