Symmetric routing and split-brain handling in software-defined high availability networks

A system comprising:

• one or more processors;
• and a memory storing instructions that, when executed by the one or more processors, configure the system to:
• receive, at a controller associated with a communication network, first status information associated with at least one of a first node or a second node, wherein the first node and the second node are used in service of a first VPN;
• in response to the first status information indicating that both the first node and the second node are advertising an active state for the first VPN, thereby indicating a split-brain condition, determine, from the first status information, a preference associated with the first node over the second node for servicing traffic of the first VPN by analyzing a route priority and a route affinity for each of the first and second nodes to resolve the split-brain condition;
• and
• generate routing information for a third node of the communication network, wherein the routing information specifies that the first node is preferred for serving traffic of the first VPN, and that the second node is available, but less preferred for servicing traffic of the first VPN;
• and
• transmit the routing information to the third node.

A non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium including instructions that when executed by a computer, cause the computer to:

• receive, at a controller associated with a communication network, first status information associated with at least one of a first node or a second node, wherein the first node and the second node are used in service of a first VPN;
• in response to the first status information indicating that both the first node and the second node are advertising an active state for the first VPN, thereby indicating a split-brain condition, determine, from the first status information, a preference associated with the first node over the second node for servicing traffic of the first VPN by analyzing a route priority and a route affinity for each of the first and second nodes to resolve the split-brain condition;
• and
• generate routing information for a third node of the communication network, wherein the routing information specifies that the first node is preferred for serving traffic of the first VPN, and that the second node is available, but less preferred for servicing traffic of the first VPN;
• and
• transmit the routing information to the third node.