Network management method and device and storage medium

The embodiment of the invention provides a network management method and device and a storage medium, relates to the technical field of communication, and is used for reducing the time delay required by a terminal for data service after roaming between ONUs (Optical Network Units). The method is applied to a master ONU, the master ONU is connected with a plurality of slave ONUs, and the method comprises: receiving port request information sent by a first slave ONU, the port request information comprising a device identifier of a first terminal connected with the first slave ONU, the port request information being used for requesting to allocate a port to the first terminal, and the first slave ONU being one of the plurality of slave ONUs; and in response to the port request information, sending first indication information to the plurality of slave ONUs, the first indication information being used for indicating a corresponding relationship between the device identifier of the first terminal and the port iden