A HiperSockets LAN can have multiple secondary Bridge Ports, but only one primary Bridge Port. Configuring the HiperSockets device as a primary Bridge Port failed because another port on the HiperSockets LAN has been configured as the primary Bridge Port.
User response
Find out which operating system instance has configured the primary
Bridge Port. Assure that the primary role for this port is withdrawn
before trying again to configure your device as the primary Bridge
Port. Alternatively, consider configuring your device as a secondary
Bridge Port.