VLAN Service Migration Using Split Horizon Rules
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Solution Overview
Problem
Existing solutions for migrating VLAN services in metro networks with mixed edge nodes (PB and PBB/IP/MPLS) are not transparent to customers, cause frequent outages, result in duplicate frames, are not pure Layer 2 solutions, and are IPv4 specific, leading to inefficient MAC table management in PB core nodes.
Innovation Solution
Implementing a method with upgraded edge nodes that provide multipoint, rooted multipoint, and point-to-point connectivity within the PB domain, using separate VLAN translation tables and split horizon rules to manage frame forwarding and prevent MAC address learning in PB core nodes, thereby reducing MAC table size and ensuring loop-free communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If VLAN services are migrated to new technology edge nodes (IP/MPLS or PBB) in a mixed network environment, then MAC table size in PB core nodes is reduced, but service transparency to customers deteriorates causing outages and duplicate frames
Solution Approach 1:
The patent segments the network into distinct functional zones: PB edge nodes handling traditional VLAN services, upgraded edge nodes handling migrated services, and PB core nodes. This segmentation allows MAC address learning to be confined to appropriate domains only, reducing MAC table sizes in PB core nodes while maintaining service transparency through proper boundary management.
Solution Approach 2:
The patent introduces an intermediary mechanism where upgraded edge nodes act as mediators between PB edge nodes and PB core nodes. These intermediaries prevent MAC address propagation into the PB core domain while maintaining end-to-end connectivity, thus reducing MAC table sizes without causing service outages or duplicate frames.
2Adaptability or versatility
If ARP requests and unknown frame filtering are used to enhance functionality in new technology edge nodes, then coordination between different technologies is improved, but the solution becomes IPv4 specific and not transparent to customers
Solution Approach 1:
The patent implements a universal Layer 2 solution that works transparently across different protocols (IPv4 and IPv6) and technology types (PB and PBB/IP/MPLS). The methodology uses protocol-agnostic mechanisms such as controlled MAC address learning and frame forwarding rules, eliminating the need for IPv4-specific ARP requests while maintaining universal compatibility.
Solution Approach 2:
The patent extracts the protocol-specific elements (ARP requests) from the solution and replaces them with protocol-agnostic Layer 2 mechanisms. This extraction allows the solution to be universally applicable across IPv4 and IPv6 environments without relying on higher-layer protocols, thereby improving versatility while reducing complexity.
3Adaptability or versatility
If VLAN services are migrated partially to new technology, then scalability is improved, but frequent outages and duplicate frames occur due to lack of transparency
Solution Approach 1:
The patent applies local quality control by enabling MAC address learning only in specific local domains (PB edge nodes and upgraded edge nodes) while preventing propagation to other domains (PB core nodes). This localized approach allows partial migration to new technology for scalability while maintaining frame delivery accuracy by controlling where MAC addresses are learned and propagated.
Solution Approach 2:
The patent implements preliminary configuration of forwarding rules and MAC address learning policies in upgraded edge nodes before migration occurs. This preliminary setup ensures that when VLAN services are migrated partially, the network is pre-configured to prevent outages and duplicate frames, maintaining reliability during the transition to improved scalability.
Data Source
AI summary
An upgraded edge node (e.g., enhanced PBB edge node, enhanced IP/MPLS edge node) and a method are described herein for providing a VLAN service for a customer in a metro network. In addition, a metro network is described herein which includes the upgraded edge nodes, traditional PB edge nodes, and a PB domain that has PB core nodes located therein.