I'm trying out OSPF ECMP on BIRD (with ECMP set and enabled on kernel) and on hosts A and host B are configured as below and connected via a switch, the dummy0 interface is used as the loopback address for two physical nics. host A eth1 - /30 - OSPF eth0 - /30 - OSPF dummy0 - /32 host B eth1 - /30 - OSPF eth0 - /30 - OSPF dummy0 - /32