Hello, I'm currently facing a dilemma. I provide consultancy services to various ISPs, and we have encountered a situation that we can't seem to resolve. I believe that the tool "topolograph" could be the solution to this problem. We need to identify which OSPF links have duplicate networks. For example, consider the following linear topology: router A connects to router B using the IP x.x.x.x/30, router B connects to router C using the IP y.y.y.y/30, and router C connects to router D using the IP z.z.z.z/30. The correct topology should be A<x.x.x.x/30>B<y.y.y.y/30>C<z.z.z.z/30>D.

Now, let's examine the first issue: A<x.x.x.x/30>B<y.y.y.y/30>C<x.x.x.x/30>D. How can we identify this duplication?

In the second problem, the topology is A<x.x.x.x/30>B<y.y.y.y/30>C<z.z.z.z/30>D<x.x.x.x/30>CLIENT, where the connection between router D and the CLIENT does not use OSPF. How can we address this issue?