BGP-LU Path Construction via Transmission Path Descriptor
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Solution Overview
Problem
The current BGP-LU mechanism can only provide the same transmission path and resources for different VPN services, making it difficult to support flexible and differentiated transmission paths required by various VPN services with different quality of service requirements, such as low-latency and low-jitter transmission.
Innovation Solution
A path construction method that involves advertising a VPN route with a transmission path descriptor (TPD) through an MP-BGP signaling channel, allowing PE nodes to determine and create label forwarding paths based on the TPD, enabling flexible and differentiated transmission paths for VPN services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the BGP-LU mechanism uses a single transmission path for all VPN services, then the system complexity is reduced and ease of operation is improved, but the adaptability to different quality of service requirements deteriorates
Solution Approach 1:
The patent segments the transmission path information by introducing TPD (Transmission Path Descriptor) attributes that classify different path types (e.g., low-latency, low-jitter, high-bandwidth). Each VPN service can be assigned a specific TPD type, dividing the single path into multiple differentiated path categories without requiring complex manual configuration for each service.
Solution Approach 2:
The patent changes the parameter representation by encoding transmission path characteristics into TPD attributes within BGP routing updates. Instead of manually configuring different paths, the system dynamically selects paths based on TPD parameters (such as latency, jitter, bandwidth requirements) that are advertised and matched automatically during route selection.
2Adaptability or versatility
If the BGP-LU mechanism provides differentiated transmission paths for different VPN services, then the adaptability to quality of service requirements is improved, but the device complexity and path management complexity increase
Solution Approach 1:
The patent makes the BGP-LU mechanism universal by designing TPD attributes that can accommodate multiple service types (voice, video, data) through a single standardized framework. The same BGP update mechanism carries both traditional routing information and TPD-based path differentiation, allowing one system to serve multiple QoS requirements without adding separate protocols or complex management interfaces.
Solution Approach 2:
The patent enables self-service by allowing PE routers to automatically match VPN service requirements with appropriate TPD-based paths through automated attribute comparison. The system performs autonomous path selection based on predefined TPD criteria without requiring manual intervention or complex centralized control, reducing operational complexity while maintaining high adaptability.
3Manufacturing precision
If the BGP-LU mechanism uses route/Prefix in the IGP routing table for label binding, then the manufacturing precision and path determination accuracy are improved, but the adaptability to flexible transmission paths deteriorates
Solution Approach 1:
The patent adds another dimension to the routing information by incorporating TPD attributes alongside traditional IGP routing tables. Instead of relying solely on prefix-based routing, the system creates a multi-dimensional path selection space that includes both destination prefix and transmission path characteristics (latency, jitter, bandwidth), enabling precise path determination while maintaining flexibility through the additional dimension.
Solution Approach 2:
The patent introduces TPD attributes as an intermediary layer between the IGP routing table and the label binding mechanism. The TPD acts as a mediator that translates service requirements into path selection criteria, allowing the system to maintain accurate prefix-based routing while injecting flexibility through the intermediate TPD matching layer that bridges routing decisions and path differentiation.
Data Source
AI summary
A path construction method and related devices are disclosed. The method may include: advertising, by a second PE node, a first VPN route to a first PE node through an MP-BGP signaling channel, such that the first PE node is able to determine a label forwarding path to a first VPN Prefix based on a first transmission path descriptor (TPD) carried in the first VPN route received; where the first TPD is configured to identify the label forwarding path for a first VPN message to reach a BGP next hop.