Network switch, network system, and network control method

A network system, comprising:

• a processor provided in a network switch coupled to first and second information processing devices;
• and
• a memory configured to store a program,
• wherein the processor performs, based on the program, operations including:
• extracting first information which is used for creating a request packet requesting a response of a first virtual machine executed by the first information processing device from the packet which is transmitted by the first virtual machine to a second virtual machine executed by the second information processing device;
• creating the request packet using the first information;
• transmitting the request packet to the first virtual machine;
• determining an operation state of the first virtual machine based on if a response packet for the request packet is received from the first virtual machine;
• and
• performing, when the operation state of the first virtual machine is determined to be in a stopped state, a setting for stopping relay of a packet other than the request packet to the first virtual machine;
• and
• transmitting a new request packet to the first virtual machine when a first period of time elapses after receiving the response with respect to the request packet transmitted previously and when a second period of time elapses in a case where a transmission of the request packet is not performed a number of times after not receiving the response with respect to the request packet previously transmitted, wherein the first period of time is longer than the second period of time.

A network control method, comprising:

• extracting first information which is used for creating a request packet requesting a response of a first virtual machine executed by a first information processing device coupled with a network switch in a network system from a packet transmitted by the first virtual machine to a second virtual machine executed by a second information processing device coupled with the network switch;
• creating the request packet using the extracted first information and transmitting the request packet to the first virtual machine;
• determining an operation state of the first virtual machine based on if a response packet for the request packet is received from the first virtual machine;
• performing, when the operation state of the first virtual machine is determined to be in a stopped state, a setting for stopping relay of a packet other than the request packet to the first virtual machine;
• and
• transmitting a new request packet to the first virtual machine when a first period of time elapses after receiving the response with respect to the request packet transmitted previously and when a second period of time elapses in a case where a transmission of the request packet is not performed a number of times after not receiving the response with respect to the request packet previously transmitted, wherein the first period of time is longer than the second period of time.