Automated Multi-Segment Pseudo Wire Establishment via Signaling Forwarding
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Solution Overview
Problem
The existing methods for establishing Multi-Segment Pseudo Wires (MS-PWs) in networks are cumbersome due to the need for manual configuration of static PW segments and complex dynamic signaling protocols, especially when multiple switching nodes are involved, leading to increased workload and maintenance complexity.
Innovation Solution
A method where control messages carrying PW labels and routing information are used to automatically forward messages between switching nodes, eliminating the need for manual configuration of PW routing tables and dynamic signaling, allowing for seamless establishment of MS-PWs across multiple switching nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static configuration is used to establish MS-PW, then the PW can be deployed with manual configuration, but the workload for manual configuration increases heavily when multiple switching nodes or multiple MS-PWs exist
Solution Approach 1:
The system enables self-service by allowing switching nodes to automatically discover and establish PW segments through LDP signaling. The terminal node initiates PW establishment by sending LDP signaling to the first switching node, which then automatically forwards the signaling to subsequent switching nodes without manual intervention. The switching nodes autonomously query their locally stored PW routing tables and establish segments based on routing information in the signaling, eliminating the need for heavy manual configuration while maintaining deployment reliability.
2Ease of operation
If dynamic protocols are used to establish MS-PW, then the PW can be established automatically, but the capability requirements for equipment increase and the PW routing table configuration becomes complicated
Solution Approach 1:
The system applies preliminary action by pre-configuring PW routing tables in each switching node before dynamic PW establishment. The terminal node and switching nodes are pre-configured with PW routing information that includes next-hop switching node identification and PW segment mapping relations. When dynamic PW establishment is triggered, the switching nodes simply query their pre-configured routing tables and forward LDP signaling according to the routing information, avoiding the need for complex real-time routing calculations and reducing equipment capability requirements.
3Reliability
If full or partially full network connections are deployed between equipment, then point to point PW can be used for service transport, but the network deployment becomes troublesome due to the continuously enlarging network
Solution Approach 1:
The system applies segmentation by dividing the end-to-end MS-PW into multiple PW segments, where each segment connects adjacent switching nodes. The terminal node initiates LDP signaling that is automatically forwarded through each switching node to establish individual segments. Each switching node independently manages its local PW segment and maintains mapping relations in its routing table. This segmentation approach allows the network to scale without requiring full mesh connections, reducing deployment complexity while maintaining service transport reliability through standardized segment interfaces.
Data Source
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AI summary
A method, a device and a system for establishing a Pseudo Wire (PW) are provided. The method includes: receiving, by a switching node, a control message, where the control message carries first Forwarding Equivalence Class (FEC) information and routing information; constructing, by the switching node, a first control message according the first FEC information and the routing information in the control message, and sending the first control message to a second terminal node; constructing, by the second terminal node, a second control message according to the first control message, where the second control message includes the second FEC information and the second routing information, and the second FEC information carries identification information of the first terminal node; and sending, by the second terminal node, the second control message to the switching node. In the method, it is unnecessary to manually configure a PW routing table on the switching node or establish a PW routing table dynamically through a routing protocol, and it is unnecessary to configure mapping relations between PW segments manually. This method achieves robust maintenance.