Cloud-based load balancing for software-defined wide area networks

A system comprising:

• a first data center;
• a second data center;
• a core;
• and
• a software-defined networking orchestrator service configured to:
• configure an overlay network to logically connect the first data center, the second data center, the core, and a branch;
• direct the first data center to advertise routes of the overlay network to the core, the routes being associated with the branch, wherein the routes advertised by the first data center establish a routing path for traffic from the branch through a first overlay tunnel between the branch and the first data center;
• monitor the first overlay tunnel for a loss of connectivity;
• detect the loss of connectivity of the first overlay tunnel;
• and
• in response to detecting the loss of connectivity of the first overlay tunnel, direct the second data center to advertise the routes of the overlay network to the core, wherein the routes advertised by the second data center reestablish the routing path for traffic from the branch through a second overlay tunnel between the branch and the second data center.

A device comprising:

• a processor;
• and
• a non-transitory computer readable medium storing instructions which, when executed by the processor, cause the processor to:
• configure an overlay network to logically connect a first data center, a second data center, a core, and a branch;
• direct the first data center to advertise routes of the overlay network to the core, the routes being associated with the branch, wherein the routes advertised by the first data center establish a routing path for traffic from the branch through a first overlay tunnel between the branch and the first data center;
• monitor the first overlay tunnel for a loss of connectivity;
• detect the loss of connectivity of the first overlay tunnel;
• and
• in response to detecting the loss of connectivity of the first overlay tunnel, direct the second data center to advertise the routes of the overlay network to the core, wherein the routes advertised by the second data center reestablish the routing path for traffic from the branch through a second overlay tunnel between the branch and the second data center.