Abstract: In order to carry highly reliable and low-latency industrial control business flows on resource-constrained and weak-performance satellite networks, an "avoidance" lightweight and highly controllable intersatellite segment routing selection mechanism called avoidance segment routing is proposed. This mechanism uses snapshots or intersatellite routing protocols to obtain entire network topology information and calculates the high-priority path according to the distribution characteristics of risk nodes in shortest first paths. Finally, segment routing technology over IPv6 is used to accurately specify the path. In view of the limited intersatellite bandwidth, a lightweight segment routing header compression algorithm adapted to different topological characteristics is also proposed. By performing binary comparison with the original SPF path and expanding the search range of the connected path, a simpler node stack is achieved. Experimental results show that the average compression rate of SRH of AVSR can reach 55%, with memory overhead below 3.5MB.

Key words: inter-satellite routing, multi-path routing, reliable transmission, segment routing