Designed and implemented RTBH threat automation: infosec-originated daily threat report (50+ flagged hosts) processed via custom Perl controller — email body parsing, Quagga vtysh CLI wrapper, /32 blackhole injection via iBGP to dual ASR 9K border routers; uRPF loose mode enforces bidirectional data-plane drop without management plane load; replaced multi-step approval/firewall-change workflow with single-operator paste operation; adopted as primary border host-enforcement mechanism.