Abstract: After a first network device traces a clock of a second network device, when the first network device cannot trace the clock of the second network device, the first network device modifies a parameter value corresponding to a synchronization source selection parameter of the first network device to a first parameter value, where the first parameter value is superior to a parameter value corresponding to a synchronization source selection parameter of the second network device.

Abstract: This application discloses a packet transmission method and apparatus, a device, and a storage medium, and relates to the field of communication technologies. The method includes: in response to that a second slave port of a network device is invalid or the second slave port does not exist, a second master port of the network device obtains a second dataset, where the second dataset is obtained by modifying a first dataset, and the first dataset includes a timestamp carried in a first clock packet received by a first slave port and data generated by the first slave port based on the first clock packet. The network device sends a second clock packet based on the second dataset through the second master port, where a timestamp carried in the second clock packet is the timestamp carried in the first clock packet.

Abstract: A method and an apparatus determines a network device receiving a first signal and at least one second signal, wherein the first signal carries data to be sent through a first flexible Ethernet interface. A first physical layer clock is determined based on the first signal. A second physical layer clock is determined based on the at least one second signal or the first physical layer clock and the at least one second signal. The first physical layer clock or the second physical layer clock is used as a sending clock of a non-flexible Ethernet interface. The network device includes the first flexible Ethernet interface and the non-flexible Ethernet interface.

Abstract: This application discloses a communication method and a device, and belongs to the communication field. The method includes: generating a passive optical network PON data frame, where the PON data frame includes an overhead area, the overhead area includes at least a part of a first timestamp, and the first timestamp is for time synchronization; and sending the PON data frame. This application can reduce operation overheads for parsing a PON data frame. This application is for time synchronization between an OLT and an ONU.

Abstract: A method for selecting a clock source includes a first network device that obtains synchronization offset data between the first network device and a second network device through a first port in a clock synchronization failed state. The first network device determines, based on the synchronization offset data, whether to refer to, during clock source selection, clock information received by the first port.

Abstract: A method includes: a first network device obtains a synchronization mode indication and synchronization information, where the synchronization mode indication indicates a target network device to perform synchronization based on the synchronization information. The first network device sends the synchronization mode indication and the synchronization information through a network that supports FlexE. A second network device receives the synchronization mode indication and the synchronization information through a network that supports FlexE. The second network device performs synchronization based on the synchronization mode indication and the synchronization information.

Abstract: This application discloses a time synchronization fault processing method, apparatus, and system, and belongs to the communication field. The method includes: When time of a first translator in a first network is not synchronized with a clock source in the first network, the first translator stops communicating time information with at least one other translator in the first network than the first translator, where the time information is used for obtaining time synchronized with a clock source in a second network.

Abstract: This application discloses a method, an apparatus, and a system for processing a time synchronization fault, and a storage medium, and belongs to the communications field. The method includes: when time of a first translator in a first network is not synchronized with a clock source that is in the first network, stopping sending, to a device communicating with the first translator, time synchronized with a clock source that is in a second network, where the device is located in the second network. In this application, incorrect time is not obtained for synchronization.

Abstract: This application provides a message processing method and apparatus, a device, and a storage medium. For a communication system including at least three network devices, a port status of one of the at least three network devices is a master state, and port statuses of the other network devices are non-master states. A first network device in the communication system receives, through a first port, a first message sent by a second port and used to measure a delay, where the second port is a port of a second network device in the communication system. The first network device skips replying with a second message based on a port status of the first port being a non-master state, to prevent a 1588 function from being disabled because the second port receives a plurality of second messages.