FA-LSP Connection Establishment via Adaptation Mode Determination
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Solution Overview
Problem
Current methods for establishing forwarding adjacency-label switched paths (FA-LSPs) in multi-layer networks face challenges in ensuring that the FA-LSPs can effectively bear client signals that meet the requirements of the client layer network, as they lack efficient mechanisms for determining and supporting the necessary adaptation modes and relationships between different signal types across layers.
Innovation Solution
A method and apparatus that involve a first node acting as the penultimate hop in the FA-LSP, which acquires and determines the required adaptation modes and relationships for client signals, and sends a connection establishment request message to the destination node to establish a connection that supports the specific signal types and adaptation modes, ensuring the FA-LSP can carry client signals meeting the client layer's needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional signaling methods are used to establish FA-LSP connections without explicit adaptation mode determination, then the connection establishment process is simpler, but the FA-LSP cannot effectively support client signals that meet client layer network requirements
Solution Approach 1:
The patent applies preliminary action by having the penultimate hop node determine the required adaptation modes and relationships before establishing the FA-LSP connection. The node acquires signal type information, determines adaptation modes from client signals to FA-LSP signals, and identifies adaptation relationships in advance, ensuring the connection is properly configured to support client signals from the outset.
Solution Approach 2:
The patent uses the penultimate hop node as an intermediary that mediates between the client layer network requirements and the server layer network implementation. This intermediate node determines adaptation modes and relationships, translating client signal requirements into appropriate FA-LSP configurations without requiring direct complex interactions between all network elements.
2Adaptability or versatility
If the penultimate hop node determines adaptation modes and relationships, then the FA-LSP can effectively bear client signals, but additional signaling messages and processing steps are required
Solution Approach 1:
The adaptation mode determination and adaptation relationship identification are performed in advance during the connection establishment process, rather than being deferred or requiring iterative adjustments. This preliminary configuration ensures the FA-LSP is immediately capable of supporting the required client signals upon establishment.
Solution Approach 2:
The solution creates a universal adaptation mechanism that can handle various client signal types (SDH, OTN, etc.) and different adaptation modes (asynchronous mapping, byte synchronous mapping, multiplexing) through a unified process at the penultimate hop node, making the system adaptable to diverse client layer requirements without requiring signal-specific specialized procedures.
3Manufacturing precision
If explicit adaptation mode information is exchanged during signaling, then the FA-LSP configuration is precise, but the signaling message complexity increases
Solution Approach 1:
The patent extracts the adaptation mode determination and adaptation relationship identification functions from the general connection establishment process and concentrates them at the penultimate hop node. This extraction allows precise adaptation configuration to be achieved through focused local processing rather than complex distributed signaling throughout the entire network path.
Data Source
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AI summary
Embodiments of the present invention relate to the field of network technologies and disclose a method and an apparatus for establishing a forwarding adjacency - label switched path connection. This ensures that an FA-LSP, after being established, is capable of bearing client signals that meet requirements of a client layer network. The technical solutions provided in the present invention includes: acquiring a first connection establishment request message; determining a destination link according to a type information, a first adaptation information, and a link peer information saved by a first node; and sending a second connection establishment request message to a destination node, where the second connection establishment request message carries destination link information, so that the destination node establishes a connection to the first node through the destination link according to the second connection establishment request message.