The interchange node or network node provides the APPN network data that is current at the time the operation is processed. The APPN network data includes information about network nodes, interchange nodes, border nodes, virtual routing nodes, and transmission groups (TGs) that connect the APPN nodes. A connection between nodes A and B is reported once for each direction: from Node A to Node B and from Node B to Node A.

The migration data host nodes, type 5 nodes and interchange nodes provide the subarea network data that is current at the time the operation is processed. The subarea network data includes information about the local VTAM® agent host, cross-domain resource managers, and virtual routes that connect the subarea nodes.

Interchange nodes are the only nodes that provide both APPN and subarea data.

If the oneTimeOnly snapshot action is requested, the initial data is returned in action linked-replies. To indicate that the initial data for the entire set of network data has been returned, the VTAM topology agent sends an additional ROIV action linked-reply that is an empty set linked-reply. Following the empty set is an RORS message.

If the ongoing snapshot action is requested, all the initial data is returned in action linked-replies, just as for the oneTimeOnly snapshot action and is followed by an empty-set linked-reply. The VTAM topology agent is then ready to process updates for the snaNetwork object.