SRv6 Node Protection via Backup SID Flag
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Solution Overview
Problem
Interactive multimedia service applications are sensitive to network packet loss and cannot tolerate network restoration times exceeding tens of milliseconds, which existing technologies fail to address effectively.
Innovation Solution
A node protection method is implemented by adding a preset flag bit to the SRH extension header to indicate the presence of a backup SID, allowing seamless switching to a backup tail node when the primary tail node becomes unreachable, ensuring continuous service delivery without traffic interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional network restoration methods are used, then network reliability is improved through rerouting, but service restoration time exceeds tens of milliseconds which cannot meet interactive multimedia service requirements
Solution Approach 1:
The patent pre-configures backup SIDs and backup tail nodes in advance within the SRH extension header. When a primary tail node fails, the network does not need to perform real-time routing calculations or wait for traditional convergence. Instead, the backup path is already prepared and can be activated immediately by updating the destination address to the backup SID, achieving service restoration within tens of milliseconds to meet interactive multimedia requirements.
2Speed
If backup paths are pre-configured in SRH extension header, then path switching speed is improved to meet service requirements, but packet header size and processing complexity increase
Solution Approach 1:
The patent reuses the existing SRH extension header structure in SRv6 packets to carry both primary and backup SIDs. Instead of creating a separate backup mechanism that would increase header size, the solution makes the SRH header multi-functional by encoding backup path information within the same structure used for primary routing. This approach enables fast path switching while minimizing additional processing complexity.
Solution Approach 2:
The patent utilizes the Flags field in the SRH extension header to indicate the presence of backup SIDs. By changing the state of flag bits rather than adding entirely new header structures, the solution achieves fast path switching capability while keeping the packet header size and processing complexity within acceptable limits. The flag bits serve as compact indicators that trigger the appropriate switching behavior.
3Reliability
If backup tail node information is added to SRH extension header, then node protection capability is improved, but packet header size increases
Solution Approach 1:
The patent adds only the essential backup SID information and flag bits to the SRH extension header, rather than including complete backup path descriptions or multiple levels of redundancy. This partial action approach provides sufficient node protection capability for single failure scenarios while minimizing the increase in packet header size. The solution includes exactly the minimum necessary information to enable fast failover without excessive overhead.
Data Source
AI summary
Embodiments of the present application provide a node protection method, device, electronic equipment and medium, which are applied to a first node, comprising: obtaining a first service packet, of which a first SRH extension header contains a first SID list and a preset flag bit, the first SID list containing a primary SID of a primary tail node on a primary path for forwarding the first service packet and a backup SID of a backup tail node, the preset flag bit being set to a first value indicating that the first SRH extension header carries the backup SID; forwarding the first service packet. After a primary tail node is unreachable and before routing converges again, a user connected downstream of the CE device will not experience traffic interruption, which ensures tail node reliability and increases network reliability.