SD-WAN Route Deduplication Service
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Solution Overview
Problem
In Software Defined Wide Area Networks (SD-WANs), duplicate network routes and IP addresses can lead to routing issues and data loss due to misconfigurations and overlapping IP subnets, especially in complex topologies like mesh networks, causing unintended data delivery to incorrect devices.
Innovation Solution
A network route management service compares received network route information with master information to identify and exclude duplicate routes and IP addresses, preventing their inclusion in the network topology, thereby ensuring accurate routing and unique IP allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If network route management service collects route information from multiple VPNCs in SD-WAN, then network routing capability is enhanced, but duplicate network routes and IP address conflicts occur
Solution Approach 1:
The system performs preliminary actions by collecting and comparing route information from multiple VPNCs before finalizing the routing table. The network route management service proactively identifies potential duplicate routes and IP address conflicts by cross-referencing route advertisements from different VPNCs, preventing these issues from affecting network reliability.
Solution Approach 2:
The system implements feedback mechanisms where the network route management service continuously monitors and compares route information from multiple VPNCs. When duplicate routes or IP address conflicts are detected, the service provides feedback to adjust routing decisions, ensuring only unique and valid routes are installed in the forwarding plane.
2Adaptability or versatility
If duplicate network routes are allowed in mesh topology, then routing flexibility is increased, but data delivery reliability deteriorates
Solution Approach 1:
The system extracts and removes duplicate route entries from the routing table before they can cause data delivery issues. By identifying and excluding duplicate network routes that point to the same destination through different VPNCs, the system maintains routing flexibility while preventing data loss and delivery failures.
Solution Approach 2:
The system converts the potential harm of duplicate routes into a benefit by using the comparison process to identify and select optimal routes. The duplicate route detection mechanism actually improves routing accuracy by ensuring only the most appropriate single route is selected, transforming a potential failure mode into a quality improvement feature.
3Quantity of substance
If network route management service processes all received route information, then route completeness is improved, but processing complexity increases
Solution Approach 1:
The system merges the route information processing functions into a centralized network route management service that handles all route comparisons and deduplication operations. By consolidating this functionality in a single service instance, the system processes complete route information from multiple VPNCs without proportionally increasing overall system complexity.
Solution Approach 2:
The system creates a simplified representation or copy of the routing table structure that can be processed efficiently. By working with a normalized version of the route information, the management service can perform comparisons and deduplication operations without processing the full complexity of all raw route advertisements from multiple sources.
Data Source
AI summary
A system and a method of preventing generation of duplicate network routes in a Software Defined Wide Area Network (SD-WAN) are described. A network route management service receives network route information from a network device connected to a subnetwork present in the SD-WAN. The network route information is compared with a master network route information for identifying presence of one or more duplicate network routes in the network route information. Upon identification, the duplicate network routes are removed from the network route information, and the network route information excluding the one or more duplicate network routes is transmitted to the network device.