Core Device VPN Label Switching via Centralized Route Tables
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Solution Overview
Problem
In hierarchical Virtual Private Network (VPN) scenarios, especially in the 5G era, the requirement for every stitching point to act as a Route Reflector (RR) for VPN label switching is inefficient and error-prone, making it difficult to achieve end-to-end service packet forwarding due to the need for manual VPN stitching and route management.
Innovation Solution
A network scheduling method where a core device receives a route forwarding table from a centralized control device, allowing it to advertise and replace VPN labels between PE devices, enabling automatic VPN management and stitching without the need for manual intervention, thus facilitating end-to-end packet forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If every stitching point serves as a Route Reflector for VPN label switching, then VPN label switching can be achieved, but network deployment complexity increases and manual route management is required
Solution Approach 1:
The patent introduces a centralized control device as an intermediary that manages VPN routing information centrally. This mediator collects routing information from PE devices, performs centralized processing including label allocation and route calculation, and distributes routing tables to core devices. This eliminates the need for every stitching point to be a Route Reflector, reducing network deployment complexity while maintaining VPN label switching capability.
2Reliability
If manual VPN stitching and route management are performed, then VPN connectivity can be established, but time consumption increases and automation is reduced
Solution Approach 1:
The patent implements automated VPN routing management where the centralized control device automatically collects routing information from PE devices, calculates optimal routes, allocates VPN labels, and distributes routing tables to core devices without manual intervention. The system self-manages the entire VPN stitching process, eliminating time-consuming manual route management while ensuring reliable VPN connectivity.
3Extent of automation
If centralized control device manages routing information, then automation level increases, but information management complexity increases
Solution Approach 1:
The patent segments routing information management into distinct components: PE devices provide local routing information, the centralized control device performs centralized processing and label allocation, and core devices execute forwarding based on distributed routing tables. This segmentation of information management responsibilities reduces overall complexity while maintaining high automation levels.
Solution Approach 2:
The centralized control device performs preliminary actions by pre-calculating routing tables and pre-allocating VPN labels before actual data forwarding occurs. This preliminary processing of routing information simplifies the management complexity by organizing all routing decisions in advance, allowing core devices to simply execute pre-computed forwarding rules.
Data Source
AI summary
Disclosed are a network scheduling method, a network device, and a readable storage medium. The method may include: receiving a route forwarding table from a centralized control device; advertising a VPN route carrying the first VPN label and next hop address information corresponding to the core device according to the route forwarding table, such that the first PE device encapsulates the first VPN label into a data packet according to the VPN route, and sends the data packet carrying the first VPN label to the core device; and replacing the first VPN label carried in the data packet with the second VPN label according to the route forwarding table, and sending the data packet carrying the second VPN label to the second PE device.