Month: 2026-04 | Repository: opensourcerouting/frr | Focus: fix timer migration during BGP session connection swaps to ensure stale route cleanup and improve stability in large-scale topologies. Summary of changes: - Fixed BGP session timer migration on connection swaps by transferring stalepath and restart timers to the keeper connection during peer_xfer_conn. Timers on the old connection (going_away) are canceled and re-armed on keeper with remaining time, ensuring stale routes are properly cleaned up after a session ends. - Targeted improvement for high churn environments (e.g., large-scale topologies with many concurrent BGP sessions) to prevent timer loss and stale route persistence. - Concrete traceability added via commit 82305e056e927b076e9991c1dfb11c244181c31d, documenting the migration logic and debugging logs that illustrate the before/after behavior. Impact: - Eliminates stale-route retention after BGP session teardown, reducing route flaps and improving network convergence in large deployments. - Strengthens BGP session teardown correctness, contributing to overall routing reliability and operational stability. Technologies/skills demonstrated: - C/C++ timer management and pointer handling in FRR BGP codepath - Understanding of BGP session lifecycle, connection swaps, and GR-helper interactions - Debugging and traceability through explicit runtime logs and careful state migration Repository owner: Shashanka K S (nvidia)

February 2026 monthly summary for LabNConsulting/frr. Delivered a new BondState column in the 'show evpn es' CLI output to indicate the operational state of local EVPN ES bonds, enhancing troubleshooting visibility. No major bugs fixed this month in the dataset; bug-fix activities, if any, are deferred to the next sprint. Impact: improved network observability for EVPN ES deployments and faster issue diagnosis, supporting higher reliability and operational efficiency. Technologies/skills demonstrated: FRR zebra module integration, CLI output customization, version control hygiene, code review, and targeted testing.