Abstract: This application provides example packet processing methods, network devices, and systems. One example method includes obtaining, by a first network device, a first data communication network (DCN) packet by using a hardware processor, where the first DCN packet is carried in a payload area of a first data frame, and the first DCN packet includes a target device identifier. The first network device determines, based on the target device identifier, by using the hardware processor, whether the first DCN packet is a direct packet. In response to determining that the first DCN packet is a direct packet, the first network device sends the first DCN packet to a second network device, where the second network device corresponds to the target device identifier.

Abstract: Embodiments of the present invention provide a packet sending method, including: receiving a packet, where the packet carries priority information indicating a priority of the packet; selecting, according to a correspondence between packet priorities and component links in a link aggregation group, a component link corresponding to the priority of the packet, where the link aggregation group includes at least a first component link and a second component link, availability of the first component link is higher than availability of the second component link, and in the correspondence between packet priorities and component links, a first priority corresponds to the first component link, a second priority corresponds to at least one of the second component link and the first component link, and the first priority is higher than the second priority; and sending the packet on the selected component link.

Abstract: Embodiments of the present invention provide a packet sending method, including: receiving a packet, where the packet carries priority information indicating a priority of the packet; selecting, according to a correspondence between packet priorities and component links in a link aggregation group, a component link corresponding to the priority of the packet, where the link aggregation group includes at least a first component link and a second component link, availability of the first component link is higher than availability of the second component link, and in the correspondence between packet priorities and component links, a first priority corresponds to the first component link, a second priority corresponds to at least one of the second component link and the first component link, and the first priority is higher than the second priority; and sending the packet on the selected component link.