Abstract: Aiming at the inflexiability of network traffic monitoring and tardy response to network emergencies for LS-LEO(large-scale low earth orbit) satellite networks, a method of network traffic monitoring for LS-LEO satellite networks based on INT(in-band network telemetry) is proposed. In order to reduce the overhead of LS-LEO satellite networks traffic monitoring, the proposed method combines the high dynamic topology characteristics of LEO satellite networks, and provides aggregation node selection of network traffic monitoring information within each domain of LEO satellite networks and leader node selection based on microburst traffic, which realizes the rapid monitoring and reporting for abnormal state information of network traffic. In the domain-based aggregation node selection strategy, the aggregation node is obtained by calculating the shortest path and delay. The microburst node is monitored by the telemetry information reporting strategy of the leader node, and the telemetry information is directly reported by the node to the aggregation node. The simulation results show that，compared with the traditional traffic monitoring method, the proposed method can effectively reduce the overhead of telemetry packets and realize flexible low-overhead monitoring of bursts in traffic. Taking the LEO satellite network scale of 500 nodes as an example, the average telemetry overhead for a flow with a path length of 7 hops can be reduced by 27.77%.

Key words: low earth orbit satellite, traffic monitoring, in-band network, aggregation strategy, node selection