Service protection method and network node

A method, comprising:

• receiving, by a third node of an optical communication system, a first data frame, wherein the optical communication system comprises a first node, a second node, and the third node, the first node is a common head node on a first working path and a first protection path, the second node is a common sink node on the first working path and the first protection path, the third node is any node other than the first node and the second node on the first protection path, the first working path is a current communication path of a service, and the first protection path is a standby path of the first working path;
• obtaining, by the third node, a bandwidth activation message from the first data frame, wherein the bandwidth activation message indicates to the third node to adjust a bandwidth of the service from a protection bandwidth to a target bandwidth, the protection bandwidth represents a pre-occupied bandwidth of the first protection path before transmission of the service, a cross-connection of the first protection path is established which pre-occupies the protection bandwidth before the transmission of the service a fault occurs on the first working path, and the target bandwidth represents an actual occupied bandwidth for the transmission of the service;
• and
• adjusting, by the third node based on the bandwidth activation message, the bandwidth of the service from the protection bandwidth to the target bandwidth.

A first node, comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing instructions that, when executed by the at least one processor, cause the first node to perform operations including:
• determining that a fault occurs on a first working path, wherein an optical communication system comprises the first node, a second node, and a third node, the first node is a common head node on the first working path and a first protection path, the second node is a common sink node on the first working path and the first protection path, the third node is any node other than the first node and the second node on the first protection path, the first working path is a current communication path of a service, and the first protection path is a standby path of the first working path;
• and
• generating a bandwidth activation message based on that the fault occurs on the first working path, wherein the bandwidth activation message indicates to the third node to adjust a bandwidth of the service from a protection bandwidth to a target bandwidth, the protection bandwidth represents a pre-occupied bandwidth of the first protection path before transmission of the service, a cross-connection of the first protection path is established which pre-occupies the protection bandwidth before the transmission of the service fault occurs, the target bandwidth represents an actual occupied bandwidth for the transmission of the service, and the protection bandwidth is less than the target bandwidth;
• and
• sending the bandwidth activation message on the first protection path.

A third node, comprising:

• at least one processor;
• and
• a non-transitory computer readable storage medium storing instructions that, when executed by the at least one processor, cause the third node to perform operations including:
• receiving a first data frame, wherein an optical communication system comprises a first node, a second node, and the third node, the first node is a common head node on a first working path and a first protection path, the second node is a common sink node on the first working path and the first protection path, the third node is any node other than the first node and the second node on the first protection path, the first working path is a current communication path of a service, and the first protection path is a standby path of the first working path;
• obtaining a bandwidth activation message from the first data frame, wherein the bandwidth activation message indicates to the third node to adjust a bandwidth of the service from a protection bandwidth to a target bandwidth, the protection bandwidth represents a pre-occupied bandwidth of the first protection path before transmission of the service, a cross-connection of the first protection path is established which pre-occupies the protection bandwidth before the transmission of the service a fault occurs on the first working path, and the target bandwidth represents an actual occupied bandwidth for the transmission of the service;
• and
• adjusting, based on the bandwidth activation message, the bandwidth of the service from the protection bandwidth to the target bandwidth.