OAM Packet Processing Method, Network Device, and Network System

An operations, administration, and maintenance (OAM) packet processing method, a network device, and a network system are provided. The method includes receiving a first Internet Protocol (IP) packet, where the first IP packet includes an OAM packet, an IP packet header of the OAM packet includes a first source device identifier (ID) and a first sink device ID, and returning a second IP packet to reply to the OAM packet, where the second IP packet includes an OAM reply packet, an IP packet header of the OAM reply packet includes a second source device ID, a second sink device ID, and a second packet type, the second source device ID is an ID of a local network device, and the second sink device ID is the same as the first source device ID. An IP packet header may be used to carry OAM information, which improves a fault detection capability in an OAM method.