Packet Transmission Method and Apparatus

A method by a second endpoint, wherein the method comprises:

• sending, to a first endpoint, a first packet comprising first indication information indicating that a first link is available, wherein the first link is between the first endpoint and the second endpoint, carries the first packet, and belongs to a first routing path between the first endpoint and a destination access device;
• and
• receiving, from the first endpoint, a second packet comprising second indication information,
• wherein the second indication information indicates that a second link is unavailable,
• wherein the second link is between the first endpoint and a next-hop third endpoint on the first routing path, and
• wherein a payload of the second packet is the same as a payload of the first packet.

A first endpoint comprising:

• a memory comprising instructions;
• and
• one or more processors coupled to the memory, wherein when executed by the one or more processors, the instructions cause the first endpoint to:
• obtain, from a second endpoint, a first packet comprising a payload and a first indication information indicating that a first link is available, wherein the first link is between the first endpoint and the second endpoint, carries the first packet, and belongs to a first routing path between the first endpoint and a destination access device;
• generate, when a second link is unavailable, a second packet, comprising the payload, wherein the second link is between the first endpoint and a third endpoint on the first routing path, wherein the second packet comprises second indication information indicating that the second link is unavailable, and wherein the third endpoint is a next-hop node of the first endpoint on the first routing path;
• and
• send, to the second endpoint, the second packet.