公开(公告)号：US20230388177A1

公开(公告)日：2023-11-30

申请号：US18226967

申请日：2023-07-27

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhiyong LI ,  Yaqun XIAO ,  Jianwu HAO ,  Sheng FANG ,  Li FAN

IPC: H04L41/0631 ,  H04L43/0823 ,  H04L45/00

CPC classification number: H04L41/0631 ,  H04L43/0823 ,  H04L45/34

Abstract: A fault detection method, a network device, and a system are provided. The method includes: After a first network device receives, through a first forwarding path in an SR policy, a BFD packet that is sent by a second network device and that includes indication information of a SID list, the first network device determines, based on the indication information of the SID list, a second forwarding path that is reversely co-routed with the first forwarding path, and sends a response packet of the BFD packet to the second network device through the second forwarding path, so that the second network device can perform fault detection on the first forwarding path based on the response packet.