Method and device for processing precise time transfer protocol message

The invention discloses a method and a device for processing a precise time transfer protocol message. The method is used for processing a PTP message in a looped network consisting of transparent clocks; the method comprises the following steps: operating a multiple spanning tree protocol MSTP in each transparent clock of the network; selecting the state of each port starting a PTP protocol in each transparent clock; according to the state of the port selected through operation of the MSTP protocol and the type of the PTP message to be processed, processing the PTP message; and forwarding the processed PTP message only in the port with a sending state. According to the method and the device, the looping of the PTP message can be prevented.