Dual-Stack Tunnel Transition for Seamless IPv4 to IPv6 Migration

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Solution Overview

Problem

Existing network transition methods from one IP address family to another, such as from IPv4 to IPv6, result in prolonged outages and data loss due to the need to shut down the original tunnel and establish a new one, disrupting network traffic flow.

Innovation Solution

Establishing a second tunnel using the new address family while maintaining the first tunnel operational, with devices configured for dual-stack functionality to support both address families, allowing seamless transition and continued network traffic flow before reallocating resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the original tunnel is shut down and a new tunnel is established to transition from one IP address family to another, then the network can be updated to the new address family, but network traffic flow is disrupted causing prolonged outages and data loss

Engineering Contradiction:

Improveaddress family transitionVSAvoidnetwork traffic continuity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent establishes the new tunnel using the second IP address family before shutting down the original tunnel. This preliminary action allows the new tunnel to be fully configured and tested while the old tunnel remains operational, ensuring network continuity during the transition process

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a dual-stack configuration as an intermediary state where network devices support both the first and second IP address families simultaneously. This intermediary configuration allows seamless transition by enabling traffic to flow through either tunnel depending on the destination, eliminating service interruption

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the original tunnel is shut down to establish a new tunnel, then the new address family can be implemented, but network resources are wasted due to prolonged tunnel coexistence and configuration overhead

Engineering Contradiction:

Improveaddress family transitionVSAvoidnetwork resource consumption

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent implements a mechanism where the network device monitors traffic flow through the new tunnel and provides feedback to determine when the original tunnel can be safely decommissioned. This feedback-driven approach ensures resources are maintained only as long as necessary, optimizing the balance between transition reliability and resource efficiency

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent creates a dynamic transition process where the network device can adjust its configuration based on real-time conditions. The dual-stack support and flexible tunnel management allow the system to adapt resource allocation during the transition, maintaining both tunnels temporarily for reliability but enabling efficient resource reclamation once the new tunnel is fully operational

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11296907B2Systems and methods for transitioning of virtualized transport networks

Publication Date: 2022.04.05 ARISTA NETWORKS INC

AI summary

Systems and methods are provided herein for an efficient method of tunneling that enables a network to transition from one address family to another address family with a reduction in traffic loss. This may be accomplished by updating network devices to support a second address family in addition to a first address family. Once the second address family is supported by the network devices, tunnel endpoints using those network devices can establish a second tunnel based on the second address family. As the second tunnel is established, the network continues to use a first tunnel to route network traffic while the first tunnel uses the first address family.