Optimized distributed routing for stretched data center models through updating route advertisements based on changes to address resolution protocol (arp) tables

A non-transitory computer readable storage medium having computer readable code thereon for optimized distributed routing, the medium including instructions in which a computer system performs operations comprising:

• in a subnet of a network, distinguishing port members of an Internet Protocol I(IP) interface or Virtual Local Area Network (VLAN) into Access Interfaces which only lead to hosts on said subnet and Trunk Interfaces which lead to other redundant routers on said subnet;
• in said subnet of a network, always advertising a network route for the subnet;
• advertising a separate host route corresponding to an Internet Protocol (IP) address of each Address Resolution Protocol (ARP) table record that points to an Access Interface;
• and
• changing route advertisements for a host in said subnet for tracked access interfaces.

A computer system comprising:

• a memory;
• a processor;
• a communications interface;
• an interconnection mechanism coupling the memory, the processor and the communications interface;
• and
• wherein the memory is encoded with an application providing optimized distributed routing, that when performed on the processor, provides a process for processing information, the process causing the computer system to perform the operations of:
• in a subnet of a network, distinguishing port members of an Internet Protocol I(IP) interface or Virtual Local Area Network (VLAN) into Access Interfaces which only lead to hosts on said subnet and Trunk Interfaces which lead to other redundant routers on said subnet;
• in said subnet of a network, always advertising a network route for the subnet;
• advertising a separate host route corresponding to an Internet Protocol (IP) address of each Address Resolution Protocol (ARP) table record that points to an Access Interface;
• and
• changing route advertisements for a host in said subnet for tracked access interfaces.