Before duplexing is established, there is the possibility of both a new and an old structure existing, but not all connectors have issued IXLREBLD REQUEST=COMPLETE.

• If a loss of connectivity to the old structure occurs, MVS™ presents the Lossconn Percentage Notification (LOSSCONNPCTNOTIFY) event to all active connectors to the structure. The event indicates the percentage loss of connectivity. It is the connectors' responsibility to devise a protocol for respondiing to the percentage value. Depending on the amount of lost connectivity as specified by the lossconn percentage, the connectors might or might not be able to continue their processing to establish duplexing.
• If a loss of connectivity to the new structure occurs, MVS presents the Loss of Connectivity (LOSSCONN) event to all active connectors to the structure and immediately initiates a fallback to the old structure. Connectors can decide to attempt duplexing again if appropriate.