VLAN Translation Device Upstream Aggregation Downstream Segmentation

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Solution Overview

Problem

Existing VLAN aggregation and translation technologies cannot translate a downstream packet into different packets on the same user port, limiting their ability to perform efficient upstream aggregation and downstream translation.

Innovation Solution

A device and method utilizing a processor, ingress VLAN translation table, egress VLAN translation table, and filtering database to translate upstream and downstream packets, allowing for upstream aggregation and downstream translation across multiple user ports by learning and recording packet information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the prior art uses the egress VLAN translation table to translate downstream packets, then the downstream packet can be translated into different downstream translation packets on different user ports, but the downstream packet cannot be translated into different downstream translation packets on the same user port

Engineering Contradiction:

Improvedownstream translation capabilityVSAvoidtranslation table structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the VLAN translation functionality by introducing a filtering database that separates the translation logic into two independent dimensions: user port (handled by egress VLAN translation table) and VLAN ID (handled by filtering database). This segmentation allows the system to translate downstream packets into different VLAN IDs on the same user port by looking up the VLAN ID mapping in the filtering database, while maintaining the existing port-based translation capability through the egress VLAN translation table.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the ingress VLAN translation table aggregates multiple upstream packets into a single upstream translation packet, then upstream aggregation is achieved, but the system cannot efficiently handle downstream translation to multiple packets on the same user port

Engineering Contradiction:

Improveupstream aggregation efficiencyVSAvoiddownstream translation flexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The filtering database acts as an intermediary between the egress VLAN translation table and the packet transmission process. It provides the additional VLAN ID mapping information needed to translate a single downstream packet into multiple different VLAN IDs on the same user port, thereby enabling downstream translation flexibility without affecting the upstream aggregation efficiency handled by the ingress VLAN translation table.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8908692B2Device for realizing upstream aggregation and downstream translation of a virtual local area network and method thereof

Publication Date: 2014.12.09 REALTEK SEMICON CORP

AI summary

A device for realizing upstream aggregation and downstream translation of a virtual local area network (VLAN) includes a buffer and a processor. The buffer is used for storing an ingress VLAN translation table and an egress VLAN translation table. The processor is used for translating an upstream packet inputted from a first user port into an upstream translation packet according to the ingress VLAN translation table, and transmitting the upstream translation packet to the Internet through an internet port, and translating a first downstream packet inputted from the internet port into a first downstream translation packet according to the egress VLAN translation table, and transmitting the first downstream translation packet to a user device through a second user port.