The value of vRtrPimNgCRPGpPfxInetTblLstChngd indicates the sysUpTime
at the time of the last modification of an entry in the
vRtrPimNgCRPGrpPrefixInetTable.
If no changes were made to the table since the last re-initialization
of the local network management subsystem, then this object
contains a zero value.