A distributed data center topology having at least a pair of active data
centers that can recover from a disaster at one of the data centers and
achieves load balancing using IGP (Interior Gateway Protocol) between
data centers. The distributed data centers use virtual IP addresses,
route health injection and Border Gateway Protocol (BGP) for business
continuance, disaster recovery and load balancing. The active/active
topology supports load balancing where each site concurrently hosts
active applications or applications can be hosted in a logical
active/standby mode. IGP and RHI (Route Health Injection) are used to
propagate routes to an edge router and BGP (Border Gateway Protocol) and
IP Anycast are used for site-to-site recovery and load balancing between
data center sites.