The number of datagrams for which this entity was not their
final IP destination and for which it was successful in
finding a path to their final destination. This object
counts the same packets as ipIfStatsOutForwDatagrams, but
allows for larger values.
Discontinuities in the value of this counter can occur at
re-initialization of the management system, and at other
times as indicated by the value of
ipIfStatsDiscontinuityTime.