The intention of a black-hole route is to draw traffic to a destination, only to discard it. You achieve it by creating a route to null0. For example, if you configured the following 'ip route 10.0.0.0 255.0.0.0 null0', and redistributed it into a routing protocol, all traffic for 10.0.0.0/255.0.0.0 woudl head to the router where they would get dropped.
If you do that, then the only thing that will do is to discard any packets for any destinations not known by the router (assuming it does not have a default route). However, the rest of the network does not learn of the route that is being black-holed.. you need to create a route to Nullo and tell the rest of the network about it.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.