Switch, controller, system, and link quality detection method

A link quality detection method performed on a local switch, wherein the method comprises:

• obtaining a detection packet, wherein the obtained detection packet comes from a previous switch on a detection path determined by a controller or the controller;
• determining whether the obtained detection packet matches a locally prestored flow table entry;
• adding operation, administration and maintenance (OAM) information to the obtained detection packet, in accordance with a requirement for each switch in the detection path to provide OAM information, according to an action instruction included in a field of the locally prestored flow table entry that specifies the OAM information added to the detection packet when the obtained detection packet matches the locally prestored flow table entry;
• and
• sending, to a next switch on the detection path, the detection packet to which the OAM information is added, until the last switch on the detection path adds OAM information to an obtained detection packet according to a prestored flow table entry, to obtain a termination detection packet comprising an accumulated OAM information including the OAM information added to the detection packet by each one of the switches in the detection path, and sends the termination detection packet to the controller, and the controller determines link quality according to the termination detection packet.

A link quality detection method, wherein the method comprises:

• determining a detection path, wherein the detection path comprises at least two switches;
• controlling each switch of the at least two switches on the detection path to obtain a detection packet, so that each switch on the detection path, after determining that the obtained detection packet matches a prestored flow table entry, adds operation, administration and maintenance (OAM) information to the successfully matched detection packet according to the prestored flow table entry, wherein an action instruction included in a field of the prestored flow table entry specifies the OAM information added to the detection packet;
• obtaining, after the controlling, a termination detection packet comprising an accumulated OAM information including the OAM information added to the detection packet by each one of the at least two switches in the detection path during the controlling;
• and
• determining, after the obtaining, a link quality of the detection path comprising the at least two switches according to the accumulated OAM information in the termination detection packet.

A local switch, comprising:

• a processor and a non-transitory computer-readable medium including computer-executable instructions that, when executed by the processor, facilitate the switch:
• obtaining a detection packet, wherein the obtained detection packet comes from a controller or a previous switch on a detection path determined by a controller;
• determining whether the obtained detection packet matches a locally prestored flow table entry;
• adding operation, administration and maintenance (OAM) information to the obtained detection packet, in accordance with a requirement for each switch in the detection path to provide OAM information, according to an action instruction included in a field of the locally prestored flow table entry that specifies the OAM information added to the obtained detection packet when the obtained detection packet matches the locally prestored flow table entry;
• and
• sending, by a transmitter cooperatively operating with the processor, to a next switch on the detection path, the detection packet to which the OAM information is added, until the last switch on the detection path adds OAM information to an obtained detection packet according to a prestored flow table entry, to obtain a termination detection packet comprising an accumulated OAM information including the OAM information added to the detection packet by each one of the switches in the detection path, and sends the termination detection packet to the controller, and the controller determines link quality according to the termination detection packet.

A controller, comprising:

• a memory storing computer-executable instructions;
• and
• a processor, configured to execute the computer-executable instructions to facilitate the controller performing a method comprising:
• determining a detection path comprising at least two switches;
• controlling each switch of the at least two switches on the detection path to obtain a detection packet, so that each switch on the detection path, after determining that the obtained detection packet matches a prestored flow table entry, adds operation, administration and maintenance (OAM) information to the successfully matched detection packet according to an action instruction included in a field of the prestored flow table entry that specifies the OAM information added to the obtained detection packet;
• obtaining, after the controlling, a termination detection packet comprising an accumulated OAM information including the OAM information added to the detection packet by each one of the at least two switches in the detection path during the controlling;
• and
• determining, after the obtaining, a link quality of the detection path comprising the at least two switches according to the accumulated OAM information in the termination detection packet.