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. In entities
that do not act as IP routers, this counter will include
only those datagrams that were Source-Routed via this
entity, and the Source-Route processing was successful.
When tracking interface statistics, the counter of the
outgoing interface is incremented for a successfully
forwarded datagram.
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
ipSystemStatsDiscontinuityTime.