ptilsen wrote: »
Wow. I'm not sure I can help how incorrect your understanding is, but I'll try. Routers on the same logical switched network are on the same broadcast domain, period. The switches in that diagram are connected to each other. That they are also connected to routers does not magically separate their broadcast domains. There are six broadcast domains in the pictured network, five between each router and one with every single device. Nothing needs to get routed to go from any router to any other router, because they are all connected by switches.
Edit: Just to ensure there's no ambiguity about which diagram I'm referencing, it's this one: