VPLS Root Node PE P2MP Pseudo Wire Forwarding
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Solution Overview
Problem
VPLS networks face inefficiencies in forwarding broadcast, multicast, and unknown unicast messages due to redundant message transmission over shared physical paths, leading to bandwidth wastage and high operating costs associated with complex BGP protocol implementation.
Innovation Solution
Implementing a method where a root node PE in the VPLS network transmits broadcast, multicast, and unknown unicast messages through a point-to-multipoint pseudo wire (P2MP PW) to leaf nodes, using the Label Distribution Protocol (LDP) for efficient message forwarding and reducing redundant transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If provider edge replicates broadcast, multicast and/or unknown unicast messages and sends them through multiple pseudo wires, then all receiving custom edge can receive the messages, but redundant message copies are created on shared physical paths, wasting network bandwidth
Solution Approach 1:
The patent merges multiple point-to-point pseudo-wires into a single point-to-multipoint pseudo-wire structure. Instead of replicating messages on each individual pseudo-wire from provider edge to custom edge, the system creates one P2MP pseudo-wire that efficiently distributes messages to multiple custom edges simultaneously, eliminating redundant message copies on shared physical paths while ensuring complete message delivery to all recipients
2Adaptability or versatility
If VPLS multicast technology uses BGP protocol for signaling, then multicast service can be provided through inclusive tree and selective tree, but the complexity of BGP protocol increases equipment requirements and implementation difficulty, resulting in high operating cost
Solution Approach 1:
The patent replaces the complex BGP protocol with a simpler signaling mechanism based on Label Distribution Protocol (LDP). Instead of implementing the full BGP protocol stack with its extensive path attributes and state management, the system uses LDP's label-based signaling to establish multicast trees, significantly reducing equipment complexity and implementation difficulty while maintaining the ability to provide inclusive tree and selective tree multicast services
3Ease of operation
If multiple PEs transmit broadcast, multicast and unknown unicast messages through traditional P2P pseudo wires, then message forwarding is possible, but the number of redundant messages on physical links increases, reducing forwarding efficiency
Solution Approach 1:
The patent transitions from a two-dimensional structure of multiple independent point-to-point pseudo-wires to a three-dimensional point-to-multipoint pseudo-wire structure. This dimensional change allows a single provider edge to establish one P2MP pseudo-wire that branches to multiple custom edges, reducing the number of physical link traversals and eliminating redundant message transmissions while preserving full message forwarding capability across the network
Data Source
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AI summary
The present invention provides a method and system for increasing forwarding efficiency of a virtual private LAN services network. The method includes: a root node provider edge (PE) in the VPLS network transmitting at least one of broadcast message, multicast message and unknown unicast message to leaf nodes PE in the same VPLS through a point-to-multipoint pseudo wire (P2MP PW). The present invention transmits messages through the P2MP PW between a PE and other PEs, thus decreasing the number of redundant messages on a physical link, increasing the forwarding efficiency of network, and reducing the network operating costs.