On a switch configured with OSPF unnumbered interfaces, some OSPF neighbors are established, some are in the INIT state, and some do not show up at all in the
cl-ospf neighbor output.
# cl-ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.80.0.2 1 Full/DROther 35.382s 10.80.0.2 swp46:10.70.0.1 10.80.0.1 1 Init/DROther 34.232s 10.80.0.1 swp47:10.70.0.1 10.80.0.1 1 Full/DROther 36.635s 10.80.0.1 swp48:10.70.0.1
Cumulus Linux, all versions
The loopback interface is missing an IP address.
Configure the IP address on the loopback interface.