Worked on the LabNConsulting/frr repository to address a routing issue involving IS-IS protocol and route-map interactions. Focused on stabilizing IS-IS redistribution by implementing an isis_redist_update mechanism in C, which ensures that redistributed routes are accurately updated when associated route-maps are modified, added, or deleted. Integrated hooks into the route-map module to automatically trigger redistribution updates, thereby improving routing correctness and reducing troubleshooting complexity in dynamic network environments. This work required a strong understanding of C programming, network routing, and route maps, and resulted in enhanced network stability by ensuring policy changes are consistently reflected in redistributed routes.