Virtual Link Aggregation STP Loop Prevention

The patent introduces a virtual switch as an intermediary component that mediates between physical networking systems. The virtual switch creates virtual ports that can be aggregated across multiple physical systems while maintaining STP compatibility. This intermediary layer allows loop prevention through virtual port numbering and state synchronization without requiring direct physical link aggregation across multiple switches, thus resolving the contradiction between network redundancy and loop prevention.

The patent segments the physical networking systems into separate entities with individual virtual ports, rather than creating a unified aggregation group. Each physical system maintains its own virtual port independently, and these segmented virtual ports are then aggregated to form a logical link. This segmentation prevents loops by ensuring that each segment maintains STP compliance while still enabling redundancy through the aggregated virtual connection.

The patent segments the physical ports into separate virtual ports on different virtual switches, then aggregates these segmented virtual ports into a logical link. This segmentation ensures that no single physical switch becomes a single point of failure, as the virtual ports are distributed across multiple physical systems. Each segment can fail independently without taking down the entire aggregated link.

The patent transitions from a two-dimensional physical port aggregation model to a three-dimensional virtual port aggregation model by introducing the virtual switch layer. This additional dimension allows ports to be aggregated across multiple physical systems while maintaining logical separation, thereby eliminating the single point of failure issue while preserving aggregation simplicity.