Path awareness method, apparatus, and system

An apparatus, used in a communication network comprising the apparatus, a plurality of intermediate nodes, and a destination node, wherein the apparatus comprises:

• at least one processor;
• a memory storing program instructions, which, when executed by the at least one processor, cause the apparatus to:
• send a first request packet to the destination node, wherein the first request packet comprises an identifier of a first node, an identifier of a first data flow, and first reserved information, wherein the first data flow is a data flow between the apparatus and the destination node, the first data flow is transmitted on a first path, the first request packet requests to determine whether the first path passes through the first node, the first node is an intermediate node of the plurality of intermediate nodes;
• receive a first response packet from the destination node, wherein the first response packet comprises the identifier of the first data flow, the identifier of the first node, and first indication information, wherein the first indication information is obtained by recording, in the first reserved information, a result about whether the first path passes through the first node, and the first indication information indicates that the first path passes through the first node or indicates that the first path does not pass through the first node;
• and
• obtain first information based on the first response packet, wherein the first information comprises information that the first path passes through the first node or the first path does not pass through the first node.

An apparatus, used in a communication network comprising a source node, a plurality of intermediate nodes, and a destination node, wherein the apparatus is an intermediate node of the plurality of intermediate nodes, and the apparatus comprises:

• at least one processor;
• a memory storing program instructions, which, when executed by the at least one processor, cause the apparatus to:
• receive a first request packet, wherein the first request packet comprises an identifier of a first node, an identifier of a first data flow, and first reserved information, wherein the first data flow is a data flow between the source node and the destination node, the first data flow is transmitted on a first path, the first request packet requests the first node to determine whether the first path passes through the first node, and the first node is an intermediate node of the plurality of intermediate nodes;
• determine whether the first path passes through the first node;
• and
• send a second request packet, wherein the second request packet comprises the identifier of the first data flow, the identifier of the first node, and first indication information, wherein the first indication information is obtained by recording, in the first reserved information, a result about whether the first path passes through the first node, and the first indication information indicates that the first path passes through the first node or indicates that the first path does not pass through the first node.

An apparatus, used in a communication network comprising a source node, a plurality of intermediate nodes, and the apparatus, wherein the apparatus comprises:

• at least one processor;
• a memory storing program instructions, which, when executed by the at least one processor, cause the apparatus to:
• receive a second request packet, wherein the second request packet comprises an identifier of a first data flow, an identifier of a first node, and first indication information, wherein the first indication information indicates that a first path passes through the first node or a first path does not pass through the first node, the first data flow is a data flow between the source node and the apparatus, the first data flow is transmitted on the first path, and the first node is an intermediate node of the plurality of intermediate nodes;
• and
• send a first response packet to the source node based on the identifier of the first data flow, wherein the first response packet comprises the identifier of the first data flow, the identifier of the first node, and the first indication information, and wherein the first indication information indicates that the first path passes through the first node or the first path does not pass through the first node.