Method, Device and System for Performing Bidirectional Forwarding Detection on Aggregated Link

A network device, wherein the network device is a first network device, wherein an aggregated link exists between a first aggregated port of the first network device and a second aggregated port of a second network device, wherein the first aggregated port comprises a first port and a second port, wherein the second aggregated port comprises a third port and a fourth port, and wherein the network device comprises:

• a memory comprising instructions;
• a processor coupled to the memory and configured to execute the instructions,
• a transmitter coupled to the processor;
• and
• a receiver coupled to the processor,
• wherein the transmitter is configured to send, to the second network device, information used to establish at least two bidirectional forwarding detection (BFD) sessions, wherein the information comprises information about the first aggregated port, information about the second aggregated port, an identifier of the first port, a session identifier associated with the identifier of the first port, an identifier of the second port, and a session identifier associated with the identifier of the second port, wherein the session identifier associated with the identifier of the first port is used to identify a BFD session that is to be established on the first port, and wherein the session identifier associated with the identifier of the second port is used to identify a BFD session that is to be established on the second port,
• wherein the memory is configured to store the information that is used to establish the at least two BFD sessions and sent to the second network device,
• wherein the receiver is configured to receive information that is used to establish at least two BFD sessions and sent by the second network device, wherein the information sent by the second network device comprises the information about the second aggregated port, the information about the first aggregated port, an identifier of the third port, a session identifier associated with the identifier of the third port, an identifier of the fourth port, and a session identifier associated with the identifier of the fourth port, wherein the session identifier associated with the identifier of the third port is the same as the session identifier associated with the identifier of the first port, wherein the session identifier associated with the identifier of the fourth port is the same as the session identifier associated with the identifier of the second port, wherein the session identifier associated with the identifier of the third port is used to identify a BFD session that is to be established on the third port, and wherein the session identifier associated with the identifier of the fourth port is used to identify a BFD session that is to be established on the fourth port, and
• wherein the processor is configured to:
• establish a BFD session between the first port and the third port and a BFD session between the second port and the fourth port according to the stored information and the information sent by the second network device;
• determine whether at least one BFD session in the established BFD sessions is up;
• and
• determine that the aggregated link is available when at least one BFD session in the established BFD sessions is up.

A system for performing bidirectional forwarding detection (BFD) on an aggregated link between a first network device and a second network device, wherein the system comprises:

• the first network device;
• and
• the second network device,
• wherein the aggregated link exists between a first aggregated port of the first network device and a second aggregated port of a second network device,
• wherein the first aggregated port comprises a first port and a second port,
• wherein the second aggregated port comprises a third port and a fourth port,
• wherein the first network device comprises:
• a memory comprising instructions;
• a processor coupled to the memory and configured to execute the instructions,
• a transmitter coupled to the processor;
• and
• a receiver coupled to the processor,
• wherein the transmitter is configured to send, to the second network device, information used to establish at least two BFD sessions,
• wherein the information comprises information about the first aggregated port,
• information about the second aggregated port, an identifier of the first port, a session identifier associated with the identifier of the first port, an identifier of the second port, and a session identifier associated with the identifier of the second port,
• wherein the session identifier associated with the identifier of the first port is used to identify a BFD session that is to be established on the first port,
• wherein the session identifier associated with the identifier of the second port is used to identify a BFD session that is to be established on the second port,
• wherein the memory is configured to store the information that is used to establish the at least two BFD sessions and sent to the second network device,
• wherein the receiver is configured to receive information that is used to establish at least two BFD sessions and sent by the second network device,
• wherein the information sent by the second network device comprises the information about the second aggregated port, the information about the first aggregated port, an identifier of the third port, a session identifier associated with the identifier of the third port, an identifier of the fourth port, and a session identifier associated with the identifier of the fourth port,
• wherein the session identifier associated with the identifier of the third port is the same as the session identifier associated with the identifier of the first port,
• wherein the session identifier associated with the identifier of the fourth port is the same as the session identifier associated with the identifier of the second port,
• wherein the session identifier associated with the identifier of the third port is used to identify a BFD session that is to be established on the third port,
• wherein the session identifier associated with the identifier of the fourth port is used to identify a BFD session that is to be established on the fourth port, and
• wherein the computer processor is configured to:
• establish a BFD session between the first port and the third port and a BFD session between the second port and the fourth port according to the stored information and the information sent by the second network device;
• determine whether at least one BFD session in the established BFD sessions is up;
• and
• determine that the aggregated link is available when at least one BFD session in the established BFD sessions is up.