Synchronizing IP information of virtual machines

An apparatus for synchronizing internet protocol (IP) information of virtual machines in a switch, the apparatus comprising at least one hardware processor and logic integrated with and/or executable by the at least one hardware processor, the logic being configured as:

• a message obtaining unit configured to obtain, prior to a migration of a virtual machine within a subnet, an IP relevant message of the virtual machine within the subnet by snooping a transmission of another device in the subnet;
• a recording unit configured to record, prior to the migration of the virtual machine within the subnet, IP information and connection information of the virtual machine based on the IP relevant message;
• and
• a modifying unit configured to modify, in response to migration of the virtual machine, connection information of the virtual machine while maintaining the IP information of the virtual machine through migration.

A computer program product, comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the embodied program instructions readable/executable by a processor to cause the processor to perform a method comprising:

• prior to a migration of a virtual machine within a subnet:
• obtaining an IP relevant message of the virtual machine within the subnet by snooping a transmission of another device in the subnet;
• recording IP information and connection information of the virtual machine based on the IP relevant message;
• and
• modifying connection information of the virtual machine in response to migration of the virtual machine, while maintaining the IP information of the virtual machine through migration.