Shared Filter Configuration for Multicast Transfer Devices
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Solution Overview
Problem
In multicast video distribution, the existing technologies face challenges in reducing the number of filters set in transfer devices, leading to increased equipment costs and operational complexity due to the inability to separate L2 and L3 multicast techniques, resulting in excessive filter settings and increased time and labor for user additions or withdrawals.
Innovation Solution
A setting device and method that utilize a shared filter system, where a recording unit maintains tables for shared filters and their applications, allowing a creation unit to determine whether new or existing shared filters should be created or diverted based on host server instructions, and a setting unit generates configurations to set shared filters among multiple interfaces in the transfer device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are prepared for each user and for each use in the transfer device, then the viewable channel can be limited according to user contract, but the number of filters exceeds the upper limit value
Solution Approach 1:
The patent creates a shared filter that can be applied to multiple users simultaneously. Instead of having separate filters for each user, a single filter configuration is reused across multiple users who subscribe to the same multicast channel, thereby reducing the total number of filters while maintaining access control functionality.
Solution Approach 2:
The patent merges multiple individual filter requirements into a single shared filter. By combining the filter settings that would otherwise be duplicated across multiple users into one centralized filter object, the system reduces the overall filter count while preserving the ability to control channel access for all applicable users.
2Reliability
If another transfer device with filter function is placed between terminal and router, then filter function can be provided, but equipment cost and operational complexity increase
Solution Approach 1:
The patent enables the existing transfer device to perform both routing and filtering functions through a shared filter mechanism. This eliminates the need for additional dedicated filter devices by making the transfer device multi-functional, thereby reducing equipment cost and simplifying the network architecture.
3Reliability
If filters are set for each user individually, then user-specific control is achieved, but time and labor increase when users are added or withdrawn
Solution Approach 1:
The shared filter allows a single filter configuration to serve multiple users simultaneously. When users are added or withdrawn, the system only needs to manage the shared filter assignment rather than creating or deleting individual filters for each user, significantly reducing operational time and labor.
4Reliability
If multicast is classified into L3 transfer techniques, then routing control is enabled, but the ability to separate L2 and L3 filter conditions is lost
Solution Approach 1:
The patent segments the filter configuration into separate components: L2 filter conditions (such as MAC address filtering) and L3 filter conditions (such as IP address and multicast group filtering). This segmentation allows each layer's filtering requirements to be independently configured and applied through the shared filter mechanism, maintaining flexibility while operating within the L3 multicast framework.
Data Source
AI summary
A filter setting device (20) includes a shared filter DB (21) having a shared filter information table (211) in which information of each shared filter is recorded and a shared filter application destination table (212) in which a transfer device of an application destination of each shared filter is recorded; a shared filter creation unit (22) for determining new creation of a shared filter or diversion of an existing shared filter by referring to a shared filter information table (211) and a shared filter application destination table (212) on the basis of an instruction of a host server (10), in the L3 transfer technology; and a configuration input unit (23) for generating a configuration on the basis of a determination result of the shared filter creation unit (22), and setting a shared filter to be shared among a plurality of IF in a transfer device (30).