IGP Zone Abstraction Using a Pseudo Node for Seamless Reorganization
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Solution Overview
Problem
Existing network reorganization processes, such as splitting a network into multiple areas, often result in significant service interruptions and are time-consuming due to the need for extensive network architecture changes.
Innovation Solution
A zone is abstracted as a single pseudo node, maintaining adjacency with external nodes while internal links are hidden, using a zone leader to manage link state advertisements and ensuring minimal service disruption during migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a network is split into multiple areas to improve scalability, then network capacity increases, but service interruptions occur and reorganization time increases
Solution Approach 1:
The patent divides the network into multiple areas with area border routers, allowing the network to scale while maintaining service continuity. Each area operates independently with its own link state database, enabling localized changes without affecting the entire network.
Solution Approach 2:
Area border routers serve as intermediaries between different areas, translating and summarizing link state information. This mediation allows areas to be split without causing service interruptions, as the border routers maintain connectivity and routing information across area boundaries.
2Quantity of substance
If a network is split into multiple areas to improve scalability, then network capacity increases, but reorganization time increases
Solution Approach 1:
By segmenting the network into independent areas, the patent enables parallel reorganization of individual areas without requiring coordinated changes across the entire network, significantly reducing reorganization time.
Solution Approach 2:
The patent establishes area border routers and inter-area routing structures in advance, so that when area splits are needed, the infrastructure is already in place to handle the transition quickly with minimal service disruption.
3Quantity of substance
If areas are used to manage large networks, then network scalability improves, but architecture complexity increases
Solution Approach 1:
The patent divides the network architecture into standardized areas with clear boundaries and roles, simplifying the overall complexity by creating modular, manageable units rather than a monolithic network structure.
Solution Approach 2:
Area border routers perform multiple functions including inter-area routing, link state summarization, and area boundary management, reducing the need for specialized devices and simplifying the architectural complexity through multi-functional components.
Data Source
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AI summary
Various systems and methods for migrating a zone to a pseudo node are described herein including a method performed by a zone edge node. In an embodiment, the method includes receiving, by the zone edge node, an execution request to initiate migration from the zone to the pseudo node. The method also includes sending, by the zone edge node, at least one Hello packet to a zone external node adjacent to the zone edge node for requesting the zone external node to create an adjacency between the pseudo node and the zone external node on the zone external node. The method further includes creating, by the zone edge node, the adjacency between the pseudo node and the zone external node on the zone edge node.