The metric that is to be used in RIP reports of this
route. If a metric value in the range of 1 to 15 is
specified, the route, together with the specified metric,
is reported. If the metric 0 is specified, the routing
table metric is calculated according to the formula
defined in a3RipIpImpMetTable (for either EGP or BGP).
(all fractions are rounded down to the next integer)