Hello, I tested the `ip-iface-crash` branch, with success! The logs/prompts are pasted below. As can be seen, the configuration is successfully switched multiple times. ``` # birdc BIRD 3.1.4+branch.ip.iface.crash.81ab0c5b006a ready. # birdc 'configure soft "/tmp/ospf/ospf-1.conf"' BIRD 3.1.4+branch.ip.iface.crash.81ab0c5b006a ready. Reading configuration from /tmp/ospf/ospf-1.conf Reconfigured # birdc 'configure soft "/tmp/ospf/ospf-2.conf"' BIRD 3.1.4+branch.ip.iface.crash.81ab0c5b006a ready. Reading configuration from /tmp/ospf/ospf-2.conf Reconfigured # birdc 'configure soft "/tmp/ospf/ospf-1.conf"' BIRD 3.1.4+branch.ip.iface.crash.81ab0c5b006a ready. Reading configuration from /tmp/ospf/ospf-1.conf Reconfigured # birdc 'configure soft "/tmp/ospf/ospf-2.conf"' BIRD 3.1.4+branch.ip.iface.crash.81ab0c5b006a ready. Reading configuration from /tmp/ospf/ospf-2.conf Reconfigured ``` ``` # ./bird -u bird -g bird -c /opt/bird/bird.conf -s/var/run/bird/bird.ctl -d bird: 2025-11-03 05:23:46.578 [0001] Chosen router ID 10.89.112.123 according to interface enp6s0 bird: 2025-11-03 05:23:46.578 [0001] Started bird: 2025-11-03 05:24:27.938 [0001] Reconfiguring bird: 2025-11-03 05:24:27.938 [0001] Adding protocol ospf1 bird: 2025-11-03 05:24:27.954 [0001] Reconfigured bird: 2025-11-03 05:24:33.768 [0001] Reconfiguring bird: 2025-11-03 05:24:33.769 [0001] ospf1: Restarting interface enp11s0.3676 (172.21.8.0/28) in area 0.0.0.1 bird: 2025-11-03 05:24:33.769 [0001] Reconfigured bird: 2025-11-03 05:28:42.624 [0001] Reconfiguring bird: 2025-11-03 05:28:42.625 [0001] ospf1: Restarting interface enp11s0.3676 (172.21.8.0/28) in area 0.0.0.1 bird: 2025-11-03 05:28:42.625 [0001] Reconfigured bird: 2025-11-03 05:28:45.170 [0001] Reconfiguring bird: 2025-11-03 05:28:45.171 [0001] ospf1: Restarting interface enp11s0.3676 (172.21.8.0/28) in area 0.0.0.1 bird: 2025-11-03 05:28:45.171 [0001] Reconfigured ``` Kind regards, Nicolas