troglobit
commented
1 month ago From the dynamic routing course I took (ages ago now), I remember there was one particular setup they really recommended setting up blackhole routes for. I have it in the course material somewhere ... just have to find the book.
Was something about delegating a bigger subnet to a router, e.g., a full /16, which that router then somehow (?) would bounce back parts of since it only cared about a subset. The originating router would then have a blackhole route for the return traffic to prevent unnecessary routing loops. (Otherwise it would "storm" until the TTL had counted down.)
4 duts, full mesh, count hops and verify neighbors, this to verify #635
One more thing that our current testing does not cover is special routes (black holes and more) this should also be tested. Maybe redistribute static and redistribute origin default (redistribute a default route)