描述
Perform Alibaba Cloud NIS (Network Intelligence Service) network path reachability analysis with forward/reverse path diagnosis, topology visualization, and resource monitoring. Use when analyzing network connectivity, diagnosing unreachable paths, checking security groups or route tables, or visualizing network topology between cloud resources. Triggers: "reachability analysis", "network path analysis", "NIS analysis", "connectivity diagnosis", "path reachable", "network troubleshooting", "可达性分析", "网络路径分析", "NIS分析", "连通性诊断", "路径可达", "网络排障".