Fractional Router Redundancy via Control Plane Extraction

The patent segments the router system into multiple independent routing devices distributed across different geographic locations. Each router operates as an independent unit with its own routing table and control plane, eliminating the dependency between primary and standby routers. This segmentation allows the system to maintain reliability while being geographically dispersed to avoid common failure modes.

The patent introduces geographic dispersion as a new dimension in the router architecture. Instead of placing standby routers in the same physical location, the system distributes routers across different geographic locations. This dimensional change from spatial proximity to spatial distribution resolves the contradiction by protecting against location-specific failures while maintaining redundancy.

The patent extracts the control plane functions from the data plane routing operations. Each router maintains an independent control plane that independently computes routing tables based on local topology information. This extraction eliminates the need for complex synchronization between primary and standby routers, as each router autonomously performs routing decisions without requiring continuous state synchronization.

Instead of synchronizing standby routers with the primary router to maintain identical states, the patent inverts the approach by allowing each router to independently compute its own routing table. The failover mechanism works by detecting primary router failure and independently activating standby routers without requiring prior synchronization, thus reducing complexity while maintaining reliability.

Each router performs self-service by independently computing its own routing table based on locally available topology information. The routing protocol enables each router to autonomously detect topology changes and update its routing table without requiring coordination with other routers. This self-service approach simplifies the system despite geographic distribution, as each router manages its own routing decisions independently.

The patent implements partial synchronization by maintaining only essential routing information locally at each router rather than synchronizing complete router states. Each router keeps a partial view of the network topology sufficient for local routing decisions, eliminating the need for excessive synchronization overhead while still enabling coordinated failover when needed.