In your transport domain, the SAP System which is configured as the domain controller is of special signifance. If this SAP System fails, you cannot make changes to the TMS configuration during this time. If your transport domain contains more than three SAP Systems, we therefore recommend that you configure a backup domain controller. If your domain controller fails, the backup controller can assume the function of the domain controller.
The SAP System that you want to use as the backup controller must have the same release version as the transport domain controller. Otherwise, configuration information may be lost when changing the domain controller.
To configure a backup domain controller: