OSPF Unnumbered Interfaces: Some OSPF Interfaces Stuck in INIT State

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Issue

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

Environment

Cumulus Linux, all versions

Cause

The loopback interface is missing an IP address.

Resolution

Configure the IP address on the loopback interface.

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