Table entry in software defined network

A controlling device, comprising:

• a processor, a non-transitory computer readable storage medium in communication with the processor, the non-transitory computer readable storage medium storing instructions executable by the processor to:
• receive an address resolution protocol (ARP) request packet sent by a host device, and respond to the host device with a locally configured global virtual Media Access Control (MAC) address;
• determine whether there is a table entry corresponding to a source MAC address and a source Internet Protocol (IP) address of the ARP request packet in a global port table;
• when there is a table entry corresponding to the source MAC address and the source IP address of the ARP request packet in the global port table, respond to the host device with the locally configured global virtual MAC address;
• when there is not a table entry corresponding to the source MAC address and the source IP address of the ARP request packet in the global port table, perform one or more of:
• discarding the ARP request packet;
• and
• generating a discarding flow table entry according to the source MAC address and the source IP address of the ARP request packet, and sending the discarding flow table entry to the host device, so that the host device discards a packet of which the source MAC address and the source IP address matches the discarding flow table entry;
• receive, from a host device, a forwarding flow table request for a forwarding flow table entry when the host device fails to find a matching forwarding flow table entry for a data packet to be forwarded;
• when a destination MAC address of the data packet is the global virtual MAC address, search a global port table for a matching MAC address according to a destination IP address of the data packet;
• generate a forwarding flow table entry according to the global port table, the forwarding flow table entry including an indicator that the destination MAC address of the data packet has been replaced with the matching MAC address found in the global port table;
• and
• send the forwarding flow table entry to the host device, so that the host device forwards a data packet matching the forwarding flow table entry.

A non-transitory computer readable storage medium, storing machine readable instructions executable by a processor to:

• receive an address resolution protocol (ARP) request packet sent by a host device, and respond to the host device with a locally configured global virtual Media Access Control (MAC) address;
• determine whether there is a table entry corresponding to a source MAC address and a source Internet Protocol (IP) address of the ARP request packet in a global port table;
• when there is a table entry corresponding to the source MAC address and the source IP address of the ARP request packet in the global port table, respond to the host device with the locally configured global virtual MAC address;
• when there is not a table entry corresponding to the source MAC address and the source IP address of the ARP request packet in the global port table, perform one or more of:
• discarding the ARP request packet;
• and
• generating a discarding flow table entry according to the source MAC address and the source IP address of the ARP request packet, and sending the discarding flow table entry to the host device so that the host device discards a packet of which the source MAC address and the source IP address matches the discarding flow table entry;
• receive, from a host device, a forwarding flow table request for a forwarding flow table entry when the host device fails to find a matching forwarding flow table entry for a data packet to be forwarded;
• when a destination MAC address of the data packet is the global virtual MAC address, search a global port table for a matching MAC address according to a destination IP address of the data packet;
• generate a forwarding flow table entry according to the global port table, the forwarding flow table entry including an indicator that the destination MAC address of the data packet has been replaced with the matching MAC address found in the global port table;
• and
• send the forwarding flow table entry to the host device, so that the host device forwards a data packet matching the forwarding flow table entry.