Ive tried setting up the loopback IP on a RB1100 and RB750. I created a Loopback bridge, added a IP address 10.0.0.1/24 (rb1100) and 10.0.0.2/24 (rb750) and configured each to their loopback interface, I then added a OSPF network 10.0.0.0/24 to each router, changed the router ID for each router to the approperiate IP. Winbox discovery doesn’t see either 10.0.0.x addresses and I can’t ping those addresses. All other routing on the ports work fine. What did I miss?
You can’t have IPs on the same subnet on loopback interfaces on two routers. Each router has a directly connected route to 10.0.0.0/24 via their repective loopback interfaces, and will ignore the route for the same prefix length via some other hop as directly connected networks have an administrative distance of 0. Either use /32 addresses, or separate subnets per router (/32s are preferred).
Thanks - I’ll give the /32 a try.