How does BIRD detect the connected network type for ospf neighbor

[Wei Huang]

When I set my ospf interface eth1's address to be 10.2.1.2/30, neighbor router ethernet interface IP address to be 10.2.1.1/30, the neighbor shows it's PTP type:


bird> sh ospf neighbors
ospf_rdomain_0:
Router ID       Pri          State      DTime   Interface  Router IP
172.16.20.76      1     Full/PtP        00:35   vni-0      10.2.1.1


If I change the interfaces' IP address to be 10.2.1.x/24 or I force interface type to be bcast in Bird's ospf config, it shows as

bird> sh ospf neighbors
ospf_rdomain_0:
Router ID       Pri          State      DTime   Interface  Router IP
172.16.20.76      1     Full/DR         00:35   vni-0      10.2.1.1

My question is how does Bird detect the connected network type?

Thanks,

Wei

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