Dynamic Link Aggregation for WAN Reliability
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Solution Overview
Problem
As network traffic increases and Ethernet technologies develop, existing link backup methods become insufficient for ensuring reliability and stability in Wide Area Networks (WANs), particularly in interconnecting Local Area Networks (LANs) and Metropolitan Area Networks (MANs), as they fail to efficiently manage bandwidth and dynamic link failures.
Innovation Solution
The method of dynamic link aggregation, where multiple Ethernet sub-interfaces are established on Ethernet interfaces, assigned to Virtual Local Area Networks (VLANs), and grouped to form aggregated links, using Link Aggregation Control Protocol (LACP) packets for heartbeat detection and load sharing, allowing for the establishment of more aggregated links with fewer Ethernet interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional link backup methods are used with increasing network traffic, then network reliability is maintained through manual backup link configuration, but bandwidth utilization is insufficient and device complexity increases
Solution Approach 1:
The patent combines multiple Ethernet physical links into a single logical link aggregation group, merging backup link functionality with main link functionality. This eliminates the need for separate manual backup configurations and reduces device complexity while maintaining network reliability through automated load sharing and failover mechanisms
Solution Approach 2:
The patent implements dynamic link aggregation where links can automatically transition between active and standby states based on real-time link quality and availability. This dynamic adjustment optimizes bandwidth utilization while maintaining reliability without requiring manual intervention or increasing device complexity
2Productivity
If more Ethernet physical links are added to increase bandwidth, then bandwidth utilization improves, but the number of Ethernet interfaces required increases
Solution Approach 1:
The patent merges multiple Ethernet physical links into a logical link aggregation group, allowing bandwidth to be increased by aggregating existing interfaces rather than adding more physical interfaces. This approach improves bandwidth utilization while minimizing the quantity of Ethernet interfaces required
Solution Approach 2:
The patent enables each Ethernet interface to serve multiple functions by participating in link aggregation groups that provide both load sharing for bandwidth increase and backup functionality for reliability. This multi-functionality allows bandwidth expansion without requiring additional dedicated interfaces
3Reliability
If manual backup link configuration is used, then network reliability is ensured through dedicated backup links, but adaptability to dynamic link failures is poor
Solution Approach 1:
The patent implements dynamic link aggregation with automated link state detection and failover mechanisms. The system continuously monitors link quality and automatically adjusts the active/standby status of member links, providing both reliability through backup capability and adaptability through real-time dynamic adjustments without manual reconfiguration
Solution Approach 2:
The patent incorporates link state detection and monitoring mechanisms that provide feedback to the link aggregation controller. This feedback enables the system to automatically respond to link failures or quality degradation by redistributing traffic through available links, maintaining reliability while adapting dynamically to changing network conditions
Data Source
AI summary
At least two Ethernet sub-interfaces are established on a first Ethernet interface and a second Ethernet interface of a first device, and each Ethernet sub-interface is assigned to a VLAN. The Ethernet sub-interfaces on the same Ethernet interface are assigned to different VLANs, and Ethernet sub-interfaces of the first Ethernet interface and the second Ethernet interface which belong to the same VLAN are added into a link-aggregation group to establish an aggregated link with a second device.