The discovery algorithm is set to choose the highest loopback address. So if you want to have loopback 0 as the management IP, you need to assign a higher IP to it. See this discovery DOC which has very detailed explanations.
I'm working on a project that includes basic router configurations. I configurated everything including: line console 0, line vty 0 15 and secret passwords. There are 3 routers in the network and every LAN is going t...