PACKET PROCESSING METHOD, APPARATUS AND SYSTEM

This application discloses a packet processing method, apparatus, and system, and belongs to the communications field. The method includes: A first network device receives a first packet, where the first packet includes a plurality of segment identifier SID lists, the plurality of SID lists include a primary SID list and at least one secondary SID list, the at least one secondary SID list includes a first secondary SID list, and the first secondary SID list is a backup of the primary SID list; and the first network device processes the first packet based on the primary SID list. This application is used to implement that, in a segment routing network, when a forwarding path indicated by a segment identifier list is faulty, data packet forwarding processing can still be implemented in the segment routing network, thereby improving network transmission reliability.