Multi-layer Traffic Steering for SDN Service Chaining

The patent segments the traffic processing function into two parts: L4/L3 parameter processing is handled by SDN switches at high speed, while L7 application-layer processing is offloaded to external application delivery controllers (ADCs). This segmentation allows each component to operate at its optimal performance level, resolving the contradiction between service chaining capability and network resource utilization.

The patent introduces ADCs as intermediary devices between the SDN network and destination servers. These ADCs perform the computationally intensive L7 traffic analysis and routing decisions, while the SDN controller handles L4/L3 steering. This intermediary architecture eliminates bottlenecks in the core network while maintaining full service chaining capability.

The patent divides the processing pipeline into two segments: fast L4/L3 packet processing performed by SDN switches using hardware acceleration, and detailed L7 application analysis performed by external ADCs. This segmentation enables high-speed forwarding while maintaining accurate traffic classification through comprehensive L7 inspection.

The patent implements preliminary L4/L3 filtering and steering by the SDN controller based on quickly processed network layer parameters. Only traffic requiring detailed L7 analysis is then forwarded to ADCs, reducing the overall processing load and latency while maintaining classification accuracy for all traffic types.

The patent creates a universal service chaining framework where ADCs can provide multiple value-added services (content filtering, parental control, security scanning, etc.) through a single standardized interface with the SDN controller. This multi-functional architecture maintains the flexibility of SDN programmability while enabling efficient provisioning of diverse services through unified L7 processing capabilities.

The patent introduces ADCs as intermediary service providers that sit between the SDN network infrastructure and end services. These ADCs translate various value-added service requirements into standardized L7 processing operations, making it easy to provision and manage diverse services while maintaining full SDN programmability and control.

The patent segments computing workload by having SDN switches handle routine L4/L3 processing for standard traffic patterns, while external ADCs handle L7 analysis for new or complex application requirements. This segmentation distributes computing resources efficiently, enabling the network to adapt to new applications without concentrating all processing demands in a single location.

The patent implements partial L7 processing by the SDN controller for basic service chaining decisions based on L4/L3 parameters, and only performs full L7 analysis when specifically required for new application types or complex service requirements. This partial action approach reduces unnecessary computing resource consumption while maintaining the ability to respond to new networking requirements.