Abstract: A packet sending method and a related device are disclosed. The method includes: A network device obtains a first packet, where an internet protocol extension header of the first packet includes a first identifier, and the first identifier indicates a service requirement corresponding to the first packet. The network device determines, based on the first identifier and a second identifier, path indication information corresponding to the first packet, where a destination address of the first packet includes the second identifier, and the path indication information herein includes one or more of a network slice identifier and a segment identifier list. The network device updates the first packet based on the path indication information to obtain a second packet, and sends the second packet.

Abstract: Embodiments of this application disclose a path data deletion method, a message forwarding method, and related apparatus. A controller disclosed in this application may obtain an identifier of an invalid path from a network node located on the invalid path, and determine, based on the identifier of the invalid path and a first network node providing the identifier of the invalid path, at least a second network node located on the invalid path. The controller is configured to send a path deletion message to the second network node to assist in cleaning invalid path data remaining in a network node, so that it is possible to disable periodic path data synchronization of a network node in a RSVP-TE mechanism. In addition, because path data of an invalid path is cleaned, abnormal data forwarding can be avoided and system stability can be improved.