log_prefix
const char *log_prefix(struct rt_node *);
log_debug("%s: %s nbr %s", __func__, log_prefix(rn),
log_debug("%s: %s nbr %s", __func__, log_prefix(rn),
__func__, log_prefix(rn), dual_event_names[event],
log_prefix(rn), dual_state_name(old_state),
log_warnx("%s failed for %s", __func__, log_prefix(rn));
log_debug("%s: prefix %s", __func__, log_prefix(rn));
log_debug("%s: prefix %s", __func__, log_prefix(rn));
log_prefix(rn), log_route_origin(eigrp->af, route->nbr),
log_debug("%s: prefix %s via %s", __func__, log_prefix(rn),
&nbr->addr), log_prefix(rn));