EVPN Tunnel Group Switching Across Multi-WAN Gateway Links
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Solution Overview
Problem
The existing data transmission methods in Ethernet Virtual Private Network (EVPN) systems face issues of coarse control granularity in silent settings for tunnels, leading to increased costs or reduced efficiency due to the simultaneous activation of high-cost tunnels when low-cost tunnels become abnormal.
Innovation Solution
Implementing a data transmission method that establishes high-priority and low-priority tunnel groups between gateway devices, where high-priority tunnels are actively used, and low-priority tunnels are in a standby state. Upon detecting abnormalities in high-priority tunnels, the system switches to low-priority tunnels for data transmission, allowing flexible and efficient use of standby tunnel groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the silent setting is applied to all tunnels under a WAN port, then the control is simplified, but the control granularity becomes coarse
Solution Approach 1:
The patent segments the WAN port-level control into tunnel group-level control. Instead of applying silent settings to all tunnels under a WAN port uniformly, the system divides tunnels into multiple tunnel groups (first tunnel group, second tunnel group, etc.), each with independent silent setting control. This allows selective activation of standby tunnels based on specific tunnel group abnormalities, achieving fine-grained control while maintaining operational simplicity through automated group-based management.
2Reliability
If high-cost tunnels are activated as standby when low-cost tunnels are abnormal, then service stability is improved, but transmission costs increase
Solution Approach 1:
The patent applies local quality by differentiating the operational state of different tunnel groups based on their cost characteristics and abnormality status. High-cost tunnels are maintained in standby state (lower resource consumption) unless their specific tunnel group becomes abnormal, at which point they are selectively activated. This localized quality control ensures service stability is improved only where necessary, minimizing unnecessary cost increases.
Solution Approach 2:
The system dynamically changes the operational parameter (active/standby state) of tunnel groups based on detected abnormalities. When a tunnel group using low-cost tunnels becomes abnormal, the corresponding high-cost tunnel group's state changes from standby to active, enabling data transmission through alternative paths. This parameter change mechanism ensures service continuity while optimizing cost by activating expensive resources only when needed.
3Reliability
If all tunnel groups are switched to standby mode, then service redundancy is improved, but data transmission efficiency decreases
Solution Approach 1:
The patent implements dynamic tunnel group state management where tunnel groups transition between active and standby states based on real-time abnormality detection. Instead of statically maintaining all tunnel groups in standby mode, the system dynamically activates only the specific tunnel group required for service continuity when abnormalities occur. This dynamic approach maintains service redundancy while preserving data transmission efficiency by keeping primary tunnel groups active during normal operation.
Data Source
AI summary
Examples of the disclosure provide a data transmission method and apparatus, a device and a medium, which relate to the technical field of communication, and is applied to a first gateway device included in a first site, the method including sending a first data stream to a second site through a first tunnel group, wherein the first tunnel group includes tunnels between the first gateway device and gateway devices included in the second site passing through a first WAN; responsive to determining that all of the tunnels included in the first tunnel group are abnormal, sending the first data stream to the second site through a second tunnel group, wherein the second tunnel group includes tunnels between the first gateway device and the gateway devices included in the second site passing through a second WAN, wherein a priority of the second WAN is lower than that of the first WAN.