This attribute indicates whether a route is selected on the basis of
minimizing the cost or the delay. Each trunk has a cost and a delay
metric associated with it. The cost or delay of a route is the sum of
the cost or delay metrics of all the trunks on the route. The route
selection algorithm uses this attribute as the minimization criteria. If
more than one route is found while using this attribute as the
minimization criteria, then the route with the smallest non-
minimization metric is chosen amongst the equivalent routes.