feat: update ospf source for learned routes

- enable changing the source address for learned ospf routes
- this enables the loopback0 interface to be used as a default src address
- ensure k8s nodes use loopback0 as default src
- ensure incus nodes use loopback0 as default src

hieradata/roles/infra/incus/node.yaml

@@ -158,6 +158,8 @@ networking::interfaces:
 # frrouting
 exporters::frr_exporter::enable: true
 frrouting::ospfd_router_id: "%{hiera('networking_loopback0_ip')}"
+frrouting::ospf_preferred_source_enable: true
+frrouting::ospf_preferred_source: "%{hiera('networking_loopback0_ip')}"
 frrouting::ospfd_redistribute:
   - connected
 frrouting::ospfd_interfaces:

hieradata/roles/infra/k8s/node.yaml

@@ -100,6 +100,8 @@ profiles::consul::client::node_rules:
 # frrouting
 exporters::frr_exporter::enable: true
 frrouting::ospfd_router_id: "%{hiera('networking_loopback0_ip')}"
+frrouting::ospf_preferred_source_enable: true
+frrouting::ospf_preferred_source: "%{hiera('networking_loopback0_ip')}"
 frrouting::ospfd_redistribute:
   - connected
 frrouting::ospfd_interfaces: