I was part of doing one of the largest network mergers ever. I am glad we didn't have to worry more about renumbering that what we already had.Let's take the speed of light for this. You can change many things aboutGiven such a turbulent soup of connectedness, what criteria for pre-allocation of routing names stands a chance of not being out-of-date as soon as it is published?
your network, but not the fact that making packets take a 10000 km
detour adds a 50 ms delay. Also, if you're going to physically move your
network renumbering is only a minor extra task in addition to everything
else that's going on.