PACKET SENDING METHOD, DEVICE, AND SYSTEM

This application provides a packet sending method, a device, and a system, and belongs to the field of EVPN technologies. In the solutions provided in this application, when a DF device switches from a first PE device to a second PE device due to a fault in a link between the first PE device and a CE device, the first PE device may send a first packet to the second PE device, so that the second PE device forwards the first packet to the CE device. Therefore, the CE device may generate or update a MAC entry in time based on the first packet forwarded by the second PE device, and may send a packet to the second PE device based on the MAC entry. In this way, the second PE device that switches to the DF device may forward the packet from the CE device, so that normal forwarding of uplink traffic sent from the CE device can be ensured, and interruption of the uplink traffic of the CE device can be avoided.