Dynamic Trunk Interface Configuration for VLAN Propagation

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Solution Overview

Problem

Manual configuration of network device interfaces to participate in VLAN information propagation protocols is tedious and error-prone, especially in dynamic network deployments.

Innovation Solution

Network devices dynamically configure interfaces to participate in VLAN information propagation protocols, simplifying the configuration process and enabling efficient VLAN information propagation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If manual configuration of network device interfaces is used to participate in VLAN information propagation protocols, then configuration control and precision are improved, but configuration time and operational complexity increase

Engineering Contradiction:

Improveconfiguration precisionVSAvoidconfiguration time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The network device automatically configures its interfaces to participate in VLAN information propagation protocols based on received configuration messages, eliminating the need for manual administrator intervention. The device self-determines which interfaces should propagate VLAN information and configures them accordingly, reducing configuration time while maintaining accuracy through protocol-based automated decision-making

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

VLAN information propagation configuration is performed in advance through authentication messages exchanged during the authentication process. The configuration is established before actual VLAN traffic needs to flow, ensuring interfaces are ready to propagate VLAN information immediately when needed, thus reducing operational delays

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If manual configuration of network device interfaces is used to participate in VLAN information propagation protocols, then configuration accuracy is improved, but ease of operation deteriorates

Engineering Contradiction:

Improveconfiguration accuracyVSAvoidconfiguration ease

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The network device autonomously determines and configures interface participation in VLAN information propagation based on authentication messages and protocol rules, eliminating complex manual configuration steps. Administrators simply initiate authentication, and the device handles all configuration details automatically, greatly simplifying operation while maintaining accuracy through protocol-enforced consistency

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

Authentication messages serve as an intermediary mechanism that carries VLAN information propagation configuration parameters between the authentication server and the network device. This intermediary structure standardizes the configuration process, ensuring accurate transmission of configuration parameters without requiring administrators to manually interpret or configure complex protocol settings

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If dynamic configuration of network device interfaces is implemented for VLAN information propagation, then adaptability is improved, but device complexity increases

Engineering Contradiction:

Improveconfiguration adaptabilityVSAvoidconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The network device dynamically adjusts interface configuration for VLAN information propagation based on real-time authentication outcomes and network conditions. Interfaces can be enabled or disabled for VLAN propagation on-demand according to authentication messages received, allowing the system to adapt to changing network requirements without manual reconfiguration while using standardized protocol mechanisms to manage the complexity

Inventive Principle:

Principle #15Dynamics

4Productivity

If automated configuration of network device interfaces is used for VLAN information propagation, then productivity is improved, but configuration control may deteriorate

Engineering Contradiction:

Improveconfiguration efficiencyVSAvoidconfiguration control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The authentication protocol provides feedback mechanisms where the authentication server verifies and validates VLAN information propagation configuration parameters before sending them to the network device. The device receives authenticated configuration messages that include verification of configuration integrity, ensuring automated configuration maintains control and reliability through protocol-enforced validation and error checking

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4716158A1Dynamic configuration of interfaces for VLAN information propagation

Publication Date: 2026.03.25 ARISTA NETWORKS INC

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AI summary

A network device may have an interface configured as a trunk interface. The network device may receive information indicative of the state of the interface for enabling or disabling VLAN information propagation using the interface. Based on the received information, the network device may appropriately configure the interface to participate in a VLAN information propagation protocol.