Communication apparatus, system, method, and non-transitory medium

A communication system comprising:

• a switch;
• and
• a controller to control the switch, wherein
• the switch comprises:
• a processor;
• a memory coupled with the processor and storing a program executable by the processor;
• and
• a plurality of network interfaces, each of the network interfaces connected to a network, wherein the processor, based on the program store in the memory, is configured to execute:
• a plurality of switch processes, each of the switch processes performing switch processing on a flow associated thereto;
• a dispatch process that receives a packet from at least one network interface out of the plurality of the network interfaces and dispatches the packet to an associated switch process, based on a dispatch rule that defines association of the flow to the associated switch process to which the flow is dispatched;
• and
• a rollback control process that performs control to roll back each of the switch processes using a saved image thereof, wherein the rollback control process is configured to:
• save an image of a switch process and an integrity measure thereof;
• check whether or not currently calculated integrity measure of the switch process is the same as integrity measure previously calculated and saved;
• and
• rollback the switch process by restoring the image thereof being saved, when the currently calculated integrity measure of the switch process is found to be not the same as the integrity measure of the switch process previously calculated and saved.

A communication method comprising:

• dispatching a packet received by a switch to an associated switch process included in the switch, based on a dispatch rule that defines association of a flow to the associated switch process to which the flow is dispatched;
• the associated switch process performing switch processing on the flow associated thereto;
• and
• performing rollback control to roll back the switch processes using a saved image thereof, wherein the rollback control includes:
• saving an image of a switch process and an integrity measure thereof;
• checking whether or not a currently calculated integrity measure of the switch process is the same as the integrity measure previously calculated and saved;
• and
• rolling back the switch process by restoring the image thereof being saved, when the currently calculated integrity measure of the switch process is found to be not the same as the integrity measure of the switch process previously calculated and saved.

A non-transitory computer-readable recording medium storing therein a program to be executed by a computer, the program causing the computer to execute processes comprising:

• a plurality of communication processes, each of the communication processes performing communication processing on a flow associated thereto;
• a dispatching process that receives a packet from a network interface and dispatches the packet to an associated communication process, based on a dispatch rule that defines association of the flow to the associated communication process to which the flow is dispatched;
• and
• a rollback control process that performs rollback of each of the communication processes using a saved image thereof
• wherein the rollback control process includes:
• saving an image of a communication process and an integrity measure thereof;
• checking whether or not a currently calculated integrity measure of the communication process is the same as the integrity measure previously calculated and saved;
• and
• rolling back the communication process by restoring the image thereof being saved, when the currently calculated integrity measure of the communication process is found to be not the same as the integrity measure of the communication process previously calculated and saved.