Packet transmission method, packet transmission apparatus, and storage medium

A transmission apparatus, comprising:

• a memory, and
• a processor coupled to the memory and configured to:
• assign, for each of a plurality of service classes, a value of a maximum transfer band indicating an upper limit of a traffic amount corresponding to the transmission apparatus;
• receive a packet transferred according to a first service class among the plurality of service classes;
• measure a traffic amount related to the first service class, based on traffic amount information for each of a plurality of service classes;
• determine whether the received packet is encapsulated;
• transfer the received packet according to the first service class without encapsulating the received packet, when it is determined that the received packet is encapsulated and when the measured traffic amount is equal to or smaller than a value of a maximum transfer band corresponding to the first service class assigned by the assigning;
• determine whether a second service class which is different from the first service class and including a free band exists among the plurality of service classes, based on the value of a maximum transfer band assigned for each of the plurality of service classes, when the measured traffic amount is more than the value of the maximum transfer band corresponding to the first service class;
• encapsulate the received packet using a header including information of the second service class, when it is determined that the second service class exists;
• and
• transfer the encapsulated received packet in the second service class.

A non-transitory computer readable storage medium storing a program that causes a computer among a plurality of computers in a network to execute a process, the computer configured to store a value of a maximum transfer band indicating an upper limit of a traffic amount corresponding to the computer, the value being assigned for each of a plurality of service classes, the process comprising:

• receiving a packet transferred according to a first service class;
• measuring a traffic amount related to the first service class, based on traffic amount information for each of a plurality of service classes;
• determining whether the received packet is encapsulated;
• transferring the received packet according to the first service class, without encapsulating the received packet, when it is determined that the received packet is encapsulated and when the measured traffic amount is equal to or smaller than a value of the maximum transfer band corresponding to the first service class assigned by the assigning;
• determining whether a second service class which is different from the first service class and includes a free band, exists among the plurality of service classes, based on the value of a maximum transfer band assigned for each of the plurality of service classes, when the measured traffic amount is more than the value of the maximum transfer band corresponding to the first service class;
• encapsulating the received packet using a header including information of the second service class, when it is determined that the second service class exists;
• and
• transferring the encapsulated received packet in the second service class.