What were you trying to do that didn't work?

Set the loopback interface to network type point-to-point so it announces the actual mask and not as a /32.

Please provide the package NVR for which bug is seen:

frr-8.5.3-4.el9

How reproducible:

Easy

Steps to reproduce

1. Add loopback IP to dev lo with mask other than a /32.
2. Configure ospfd.conf interface lo with ip ospf network point-to-point.
3. Run vtysh and show ip ospf route. Route will show it as /32.
4. Run 'show run' and the network point-to-point statement will not be shown on the interface.

Expected results

The route table should show the network with the mask as configured on the interface.

The running configuration should show the 'ip ospf network point-to-point' statement on the lo interface.

Actual results

Route is a /32 and network type point-to-point missing from configuration.

This is fixed in FRR 8.5.5.

Patch from this issue applied to 8.5.3 fixes it as well.

https://github.com/FRRouting/frr/pull/15873