The DRS_MSG_REPSYNC union defines the request messages sent to the IDL_DRSReplicaSync method. Only one version, identified by dwVersion = 1, is currently defined.

 typedef 
 [switch_type(DWORD)] 
 union {
   [case(1)] 
     DRS_MSG_REPSYNC_V1 V1;
   [case(2)]
     DRS_MSG_REPSYNC_V2 V2;
 } DRS_MSG_REPSYNC;

V1: The version 1 request.

V2:  The version 2 request.