Anycast Router Tunneling for Congestion-Aware Traffic Balancing

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Solution Overview

Problem

Anycast networks face performance issues when servers become congested or are targeted by network attacks, leading to increased latency and reduced efficiency due to reliance on topographically/geographically closest servers.

Innovation Solution

The creation of logical tunnels between remote and local routers allows remote servers to be logically associated with the network segment, enabling load balancing by advertising equivalent administrative costs, thus utilizing geographically distant servers as local resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If Anycast networks rely on topographically/geographically closest servers, then routing efficiency is improved, but network performance deteriorates when servers become congested or are targeted by attacks

Engineering Contradiction:

Improverouting efficiencyVSAvoidnetwork performance

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent implements dynamic tunnel creation between routers based on real-time server performance monitoring. When congestion or attacks are detected, logical tunnels are dynamically established to redirect traffic to remote servers, allowing the network to adapt its routing paths in response to changing conditions while maintaining service availability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent introduces logical tunnels as intermediary pathways between local and remote servers. These tunnels act as mediators that enable traffic to be routed through alternative paths when direct paths to local servers are compromised, effectively decoupling the Anycast routing mechanism from strict geographical proximity requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If remote servers are utilized for load balancing, then network reliability is improved, but routing complexity increases due to tunnel creation and management

Engineering Contradiction:

Improvenetwork performanceVSAvoidrouting complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent enables routers to autonomously monitor server performance metrics and automatically create or terminate logical tunnels based on predefined thresholds. This self-service mechanism eliminates the need for manual tunnel configuration and management, reducing operational complexity while maintaining reliable load balancing across distributed servers

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent changes the routing parameter from strict geographical proximity to performance-based selection. By monitoring server response times, bandwidth availability, and load metrics, the system dynamically adjusts routing decisions based on current performance parameters rather than static geographical locations, simplifying the overall routing logic

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If logical tunnels are created for remote servers, then server accessibility is improved, but network latency may increase due to additional routing paths

Engineering Contradiction:

Improveserver accessibilityVSAvoidnetwork latency

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent implements partial tunnel creation by establishing logical tunnels only for specific remote servers that meet performance criteria, rather than creating tunnels to all possible remote servers. This selective approach ensures that traffic is routed through tunnels only when necessary, minimizing additional latency while maintaining server accessibility

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250317381A1Router fluidity using tunneling

Publication Date: 2025.10.09 LEVEL 3 COMMUNICATIONS LLC

AI summary

The present application describes a system and method for utilizing a tunnel in a networking routing protocol to provide a network segment access to additional servers when certain load balancing trigger events are detected.