Monthly summary for 2026-03 (sonic-sairedis, sonic-net/sonic-sairedis): Key features delivered: - L2 VXLAN EVPN support and tunnel management implemented, enabling creation and management of L2 VXLAN tunnels. Added tunnel-specific utility methods and safety checks for tunnel bridge ports, with graceful handling when VNI-to-VLAN mappings are absent to improve stability and functionality. Major bugs fixed: - Resolved potential null dereference and segfault risks in tunnel paths (e.g., vpp_remove_vlan_member) by introducing bridge-port type checks and guards for tunnel bridge ports. - Strengthened FDB and tunnel map handling (guarded vpp_fdbentry_add/del/flush and related code) to prevent crashes during tunnel map deletions and interface flush operations. - Ensured removal/creation paths do not rely on missing VNI-to-VLAN mappings or incorrect default VRF associations. Overall impact and accomplishments: - Stabilized overlay networking via L2 VXLAN EVPN, increasing reliability for deployment of VXLAN-based networks and simplifying operations for customers. - Reduced crash risk and runtime errors in critical path tunnels, fdb operations, and tunnel map management. - Accelerated time-to-value for customers adopting VXLAN overlays by delivering robust, maintainable code with clear safety checks. Technologies/skills demonstrated: - C++/VPP integration, SAI bridge port handling, and tunneling logic. - Defensive programming with type checks and guard rails across create/remove and FDB paths. - Debugging and code hygiene improvements, multi-commit collaboration, and PR risk mitigation.