This attribute indicates the minimum DPN throughput metric to the
destination RID. The throughput metric associated with a path is
computed by the routing system by translating the smallest
tputMetric calculated for the destination. A path with a lower metric
value is preferable to one with a higher value as it is associated with
higher bandwidth facilities. The metric displayed is that of the best
path to the destination. This metric is advertised to neighbor RMs
and Passports in a different RID subnet.
A metric value of 255 means the RID is unreachable in the
throughput class of service. A value of 0 indicates that no cost is
associated with the path to the destination. This would be the case
for the local node's RID.