Currently have ospf running on our network between R1,R2+R3(linear - See diag), ospf is configured on each router to use loop address(/32) as it's router-id.
Introduced a link between R1+R3, and ospf is not working - I see R1 + R3 sending hellos via the new link, but not receiving any reply over this new link(ping connectivity is working fine) - I'm guessing what is happening is that the routes for the loop addresses that ospf is using as router-id, are currently learnt via ospf via R2, and this is causing ospf on the new link to fail?
ospf is definitely enabled on the new interfaces, and have disabled passive interface on them.
Is ospf point-to-multipoint required in this type of scenario?
Any suggestions are greatly appreciated
I see both of your routers think they are the DR and your are using a /30 address as IP address for both side. My question is anything blocking the OSPF multicast address? You can try to change it to unicast and let us know the result
ip ospf network non-broadcast
router ospf xx