Embodiments of this application disclose a traffic monitoring method, an apparatus, an integrated circuit, a network device, and a network system. When receiving a first packet, a traffic collection apparatus determines that a measurement value of a target performance indicator of the first packet matches a value of first information in a first register, updates a value of second information in the first register based on the measurement value of the target performance indicator of the first packet, and increases a value of third information in the first register by 1.