Dual Adjacency Edge Device Communication Redundancy
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Solution Overview
Problem
Existing network configurations lack a redundant mechanism to efficiently communicate and respond to failures in both local and core networks, leading to potential communication disruptions and traffic loops due to delayed detection of edge device failures.
Innovation Solution
Implementing dual-adjacency between edge devices through both local and core network channels, utilizing site and overlay communication channels with a site-identifier to establish and maintain reliable communication, enabling proactive notification of failures and preventing traffic loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If edge devices communicate only through local network channels, then communication within the site is efficient, but redundancy and failure detection capability are insufficient
Solution Approach 1:
The patent introduces a second communication dimension by establishing overlay adjacencies through the core network in addition to traditional site adjacencies through the local network. This dual-path architecture allows edge devices to communicate via two independent topological paths, providing redundancy and improved failure detection without significantly increasing operational complexity.
2Reliability
If dual-adjacency is implemented between edge devices, then failure detection and notification capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the communication path into two distinct adjacencies: site adjacency for local network communication and overlay adjacency for core network communication. Each adjacency is independently configured and managed, allowing failure detection and notification through separate channels. This segmentation enables reliable dual-path communication while maintaining manageable device configuration through clear separation of concerns.
3Device complexity
If traditional single-path communication is used, then device complexity is low, but traffic loops and communication disruptions occur during failures
Solution Approach 1:
The patent implements feedback mechanisms where edge devices continuously monitor the status of both site and overlay adjacencies. When a failure is detected on one path, the device automatically notifies neighboring edge devices through the alternative path, enabling rapid failure detection and preventing traffic loops. This feedback-driven approach eliminates harmful effects while maintaining manageable complexity through automated responses.
Data Source
AI summary
Devices, methods and instructions encoded on computer readable medium for implementation of a dual-adjacency between edge devices of a network site. A first edge device comprises one or more local interfaces configured for communication, via a local network, with one or more network devices co-located in a first network site. The first edge device also comprises one or more overlay interfaces configured for communication, via a core network, with one or more network devices located in one or more other network sites connected to the core network. The first edge device comprises a processor configured to establish, via at least one of the local interfaces, a site communication channel with a second edge device co-located in the first network site. The processor is further configured to establish an overlay communication channel, via at least one of the overlay interfaces, with the second edge device.