SD-WAN Route Selection Using Transport Compatibility Filtering
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Solution Overview
Problem
SD-WAN controllers indiscriminately distribute routes that are often not compatible with the configurations of edge network devices, leading to unusable paths and scalability issues due to the need to send a high number of non-viable paths to ensure viable paths are received, which increases computational and storage load.
Innovation Solution
The SD-WAN controller uses a transport compatibility matrix and heuristics to determine compatible routes based on tunnel-group-IDs and transport colors, ensuring only viable routes are distributed, reducing the send-path-limit and optimizing memory and CPU usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SD-WAN controller distributes a high number of routes to ensure viable paths are received, then route availability improves, but computational and storage load increases
Solution Approach 1:
The SD-WAN controller performs preliminary analysis of route compatibility by examining transport colors and tunnel-group-IDs before distributing routes. This pre-filtering action ensures that only compatible routes are selected for distribution, eliminating the need to send excessive non-viable paths while maintaining reliable route availability.
Solution Approach 2:
Edge network devices provide self-service by advertising their supported transport colors and tunnel-group-IDs to the SD-WAN controller. This allows the controller to automatically determine route compatibility without manual configuration, reducing computational load while ensuring reliable route distribution.
2Speed
If the SD-WAN controller distributes routes without compatibility checking, then distribution speed improves, but route usability deteriorates
Solution Approach 1:
The SD-WAN controller performs preliminary compatibility checking by comparing transport colors and tunnel-group-IDs before route distribution. This pre-validation ensures that only usable routes are distributed, maintaining high route usability without significantly impacting distribution speed.
Solution Approach 2:
The compatibility checking process extracts and compares specific attributes (transport colors, tunnel-group-IDs) from route data. By focusing only on these critical attributes rather than analyzing entire route configurations, the system maintains fast distribution speed while ensuring route usability.
3Reliability
If the send-path-limit is increased to ensure viable paths are received, then route availability improves, but memory and CPU usage increases
Solution Approach 1:
The SD-WAN controller performs preliminary compatibility filtering using transport colors and tunnel-group-IDs before applying the send-path-limit. This pre-filtering reduces the pool of candidate routes, allowing the controller to maintain a lower send-path-limit while still ensuring viable path availability, thereby reducing memory and CPU usage.
Solution Approach 2:
The system changes the parameter of route selection by introducing compatibility-based filtering criteria (transport colors, tunnel-group-IDs) before applying the send-path-limit. This parameter change allows for more efficient route selection with lower resource consumption while maintaining route availability.
Data Source
AI summary
The present technology intelligently selects routes to be distributed to edge network device from SD-WAN controllers. Rather than indiscriminately distributing routes, the present technology utilizes logic to account for route viability conditions to determine whether a route between a first edge network device and a second edge network device is likely to be usable between the edge network devices.