Service Protection Method and Network Node

A service protection method implemented by a third node of a communication system, wherein the service protection method comprises:

• receiving a first data frame on a first protection path, wherein the third node is a second sink node of the first protection path, wherein the first protection path is a backup path of a first working path of a service, and wherein the service is a layer 3 (L3) service;
• obtaining, from the first data frame, a service switching message instructing the third node to adjust a bandwidth of the service from a guard bandwidth to a target bandwidth, wherein the guard bandwidth represents a pre-occupied bandwidth of the first protection path before the service is transmitted, wherein the target bandwidth represents an occupied bandwidth for transmitting the service on the first protection path, and wherein the guard bandwidth is less than the target bandwidth;
• and
• adjusting, based on the service switching message, the bandwidth from the guard bandwidth to the target bandwidth.

A communication device comprising:

• a memory configured to store instructions;
• and
• one or more processors coupled to the memory and configured to execute the instructions to cause the communication device to:
• determine that a fault has occurred on a first working path of a layer 3 (L3) service, wherein the communication device is a first head node of the first working path, wherein the first working path is a current communication path of the L3 service;
• generate, in response to determining that the fault has occurred on the first working path, a service switching message instructing to adjust a bandwidth of the L3 service from a guard bandwidth to a target bandwidth, wherein the guard bandwidth represents a pre-occupied bandwidth of a first protection path before the L3 service is transmitted, wherein the target bandwidth represents an actually occupied bandwidth for transmitting the L3 service on the first protection path, wherein the guard bandwidth is less than the target bandwidth, wherein the first head node is a second head node of the first protection path, and wherein the first protection path is a backup path of the first working path;
• send, on the first protection path, the service switching message;
• and
• switch a current working route to a working route corresponding to the first protection path.