Hello Networklessos team,
Speaking more about null 0 routes, I have understood that:
-Null routes give you the possibility to improve stability and can give you the advantage to avoid updates frequently on your routing table, because of some interfaces are flapping.
-Null routes prevent routing loops:
ºIn case you are using summarization it creates by default a null route (I have seen this behavior in other labs)
ºIn case that not all IP addresses are always in use: routing loops can occur when external hosts try to reach IP addresses that are not currently assigned but are part of the summary route.
Let me know if that appreciation by my side is correct.