All areas in an Open Shortest Path First (OSPF) autonomous system must be physically connected to the backbone area (Area 0).
In addtion to amit, where this is not possible, you can use a virtual link to connect to the backbone through a non-backbone area. You can also use virtual links to connect two parts of a partitioned backbone through a non-backbone area
Or even u can have GRE tunnel insted of this creating virtual link between those two routers.
Yes that would certainly suffice as a connection to area 0. In fact it is not necessary that all routers form a neighbor relationship with the ABP directly. It is sufficient that within the interconnected routers of the area that at least one has a connection to area 0.
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.