Service fault locating method and apparatus

A service fault locating apparatus comprising:

• a processor;
• and
• a non-transitory computer readable medium which contains computer-executable instructions;
• wherein the processor is configured to execute the computer-executable instructions to perform operations comprising:
• receiving a service fault locating request message, wherein the service fault locating request message carries a Network Protocol (IP) address IPS of a source layer-3 device of a service packet, an IP address IPD of a destination layer-3 device of the service packet, and a characteristic parameter of the service packet;
• determining, according to the characteristic parameter of the service packet, the IPS, and the IPD, that a service fault is between a first layer-3 device and a second layer-3 device, wherein the second layer-3 device is a next hop layer-3 device of the first layer-3 device;
• obtaining a first network topology between the first layer-3 device and the second layer-3 device;
• determining a first forwarding path of the service packet between the first layer-3 device and the second layer-3 device according to the first network topology and the characteristic parameter of the service packet;
• configuring a forwarding entry for a forwarding device in the first forwarding path, and triggering the first layer-3 device to generate an extended layer-2 OAM packet, so that the forwarding device forwards the extended layer-2 OAM packet according to the first forwarding path;
• and
• obtaining a first path parameter that is of the first forwarding path and sent by the forwarding device, and determining a specific location of the service fault according to the first path parameter.