Dynamic LSP Binding via Signaling in MPLS Networks

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Solution Overview

Problem

The existing methods for binding work Label Switching Path (LSP) with protection LSP in MPLS networks require static configuration, making operations difficult and management cumbersome, especially in upgrading and maintaining networks.

Innovation Solution

A method where a Path Switching Label Switching Router (PSL) requests the creation of a protection LSP from a Path Merging Label Switching Router (PML) via signaling, allowing dynamic binding of work LSP with protection LSP, eliminating the need for static configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If work LSP and protection LSP are bound through static configuration, then binding relationship is established, but operation difficulty increases and management becomes cumbersome

Engineering Contradiction:

Improvebinding relationshipVSAvoidoperation difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent transforms the static configuration method into a dynamic automatic binding method. The binding relationship between work LSP and protection LSP is established automatically through signaling interaction between PSL and PML routers during LSP establishment, eliminating the need for manual static configuration and reducing operational complexity while maintaining reliable binding.

Inventive Principle:

Principle #15Dynamics

2Reliability

If work LSP, protection LSP and return LSP are bound through static configuration, then binding relationship is established, but maintenance burden increases

Engineering Contradiction:

Improvebinding relationshipVSAvoidmaintenance burden

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The system implements self-service automatic binding where the PSL and PML routers automatically establish and maintain binding relationships through signaling interaction. The routers autonomously manage the binding of work LSP, protection LSP, and return LSP without requiring manual intervention for maintenance, thereby reducing the maintenance burden while ensuring reliable binding relationships.

Inventive Principle:

Principle #25Self-service

3Reliability

If static configuration method is used for LSP binding, then binding is achieved, but service management complexity increases

Engineering Contradiction:

ImprovebindingVSAvoidservice management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces signaling messages as intermediaries between PSL and PML routers to facilitate automatic binding. The signaling mechanism carries binding information and coordinates the establishment of binding relationships, eliminating the need for complex manual service management while ensuring reliable binding through structured automated interaction.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8856381B2Method for binding work label switching path and protection label switching path

Publication Date: 2014.10.07 HUAWEI TECH CO LTD

AI summary

A method for binding a work Label Switch Path (LSP) with a protection LSP, including: transmitting a first message including binding information to a Path Merging Label Switching Router (PML) via a Path Switching Label Switching Router (PSL) so as to request for creating a protection LSP of the work LSP; the PML router assigning a label for the protection LSP based on the first message and returning a second message carrying the binding information; after receiving the second message, the PSL router binding the work LSP with the protection LSP based on the binding information, and transmitting a notification message including the binding information to the PML router; the PML router binding the work LSP with the protection LSP based on the binding information in the notification message.