VLAN Bundling for Unambiguous DSL Subscriber Identification
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Solution Overview
Problem
Existing systems face challenges in directing subscriber traffic to a specific feature server and identifying subscribers without ambiguity in Ethernet networks, particularly in DSLAM traffic aggregation, leading to issues with reverse mapping and security concerns.
Innovation Solution
The implementation of VLAN bundling using IEEE 802.1ad specification, where inner VLAN tags identify subscribers and outer VLAN tags specify DSLAM/feature server pairs, ensuring unambiguous forwarding of traffic in both directions, and extending the DSLAM/feature server pair capacity using 802.1p bits for prioritization and dynamic multicast filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If Ethernet technology is used to replace ATM for DSLAM traffic aggregation, then device complexity and ease of operation are improved, but subscriber identification and traffic forwarding become ambiguous without proper tagging mechanisms
Solution Approach 1:
The patent segments the Ethernet frame identification space by introducing VLAN tags that divide subscribers into distinct Virtual Local Area Networks. Each VLAN tag contains a VLAN ID that uniquely identifies a subscriber or service group, enabling unambiguous identification without the complexity of ATM virtual circuits. This segmentation allows multiple subscribers to share the same physical Ethernet infrastructure while maintaining logical separation and precise identification.
2Ease of operation
If traditional Ethernet MAC addresses are used for subscriber identification, then ease of operation is improved, but conflicts from overlapping MAC addresses cause reliability issues
Solution Approach 1:
The patent introduces VLAN tags as an intermediary layer between the Ethernet MAC address and subscriber identification. Instead of relying solely on MAC addresses, the VLAN tag acts as a mediator that provides an additional level of identification. The combination of MAC address and VLAN tag creates a unique identifier for each subscriber, eliminating conflicts from overlapping MAC addresses while maintaining the simplicity of Ethernet operation.
3Reliability
If VLAN bundling with IEEE 802.1ad is implemented, then subscriber identification accuracy is improved, but device complexity increases due to additional tagging mechanisms
Solution Approach 1:
The patent leverages the universal IEEE 802.1ad VLAN bundling standard to achieve reliable subscriber identification. By using a standardized tagging mechanism that can identify multiple subscribers and services simultaneously, the system avoids the need for proprietary or custom identification schemes. The VLAN tags serve multiple functions including subscriber identification, service differentiation, and traffic forwarding, reducing overall system complexity despite the added tagging layer.
4Reliability
If separate Virtual Circuits are established for each subscriber in ATM networks, then subscriber identification reliability is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent merges multiple subscriber traffic streams into a single Ethernet link while maintaining unique identification through VLAN tags. Instead of establishing separate physical or logical circuits for each subscriber as in ATM networks, multiple subscribers share the same Ethernet infrastructure with their traffic differentiated by VLAN tags. This consolidation reduces device complexity and resource consumption while maintaining the reliability of unique subscriber identification and traffic separation.
Data Source
AI summary
A DSLAM aggregation topology VLAN bundling mechanism includes an edge device port that receives a packet from a Digital Subscriber Line Access Multiplexer (DSLAM) device, the packet including an inner Virtual Local Area Network (VLAN) tag that identifies a Digital Subscriber Line (DSL) subscriber. A processor of the edge device adds an outer VLAN tag to the packet, the outer VLAN tag identifying the DSLAM and a destination server coupled to an Ethernet access network. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).