Intra area routes are routes that are originated and learned in the same area. OSPF uses LSA type 1 and type 2 to advertise intra area routes. OSPF uses the type 1 and type 2 LSA to build the topology map of the area and to determine the best routes within the area. In routing table the intra area routes are identified as O in the routing table.
Inter area routes are routes that originated in some other OSPF area and are advertised into your area. Inter area routes are advertised with LSA type 3. The type 3 LSA is generated by Border routers. So for example let us consider a Border router that has interfaces in area 0 and in area 5. It will take the intra area routes for area 5 (learned from the type 1 and type 2 LSAs) and will generate type 3 LSAs for area 0 and advertise these type 3 LSAs into area 0. The Border router will also take the intra area routes for area 0 and will generate type 3 LSAs for area 5 and will advertise the type 3 LSAs to other OSPF routers in area 5. The inter area routes are identified as O IA.
In OSPF routing an intra area route will always be preferred over an equivalent inter area route.
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.