CISCO null0 interface and router bgp, what can go wrong?

Question

Computer networks

Please explain in detail, I will be most grateful.

Answer 1

Blackhole technique. We propagate the route through the network in such a way that all traffic goes to a specific router. As soon as the traffic arrives at the router, it will not leave it anywhere, as it will go to null0

Answer 2

regular way of announcing networks.
BGP advertises only what is in the routing table. There is not always exactly a complete route for the entire announced prefix. Therefore, we write the announcement of the entire prefix in null0, then we route it with more specific routes at home, and we announce the entire prefix.
PS. What went wrong? )